C64 power supply issue. Keelog (in Europe) makes good replacements.

C64 power supply issue Replacement power supply for Commodore 64 and VIC-20; Stabilized 5V/2. The C64 and C128 power supplies are available in two shapes. C64 power supplies are ancient, repositories, users, issues, pull requests Search Clear. 1A AC The vast majority of these power supplies is recognizable by general-purpose plastic enclosures and internal components wired up in a true DIY style. That's doable. You've all seen the inside of a Commodore C64 Power Supply - what a potted mess of uselessness! Let's take a look inside the C128 PS and see if its any more Our power supply tester series for Commodore C64, C128, Amiga 500/500+/600/1200, Atari XL/XE, and ZX Spectrum +2A/+2B/+3 was created specifically to address this issue. At worse it's an old power supply that someone slapped new stickers and a new mains lead onto and it will be just as dangerous as the one you have. Somewhere between 10 and 20 million C64s are estimated to have been produced, and even if a huge number of power supplies (like 100,000) have failed, that is still a very small percentage of what was produced. What is the best way to test the power supply before I plug it in to the computer? I have a multi-meter. 5. Moderator: Lemoners. The first is called Classic and with a size of 86 mm x 70 mm x 48 mm (3. Some people are saying 4. Black wires are ground ( 0V ) levels. 0") Round DIN7 plug for C64 and DIN4 plug for FDD. 0A DC output with anti-ripple filter Transformer-generated 9V/1. 2" x 2. S. This time however it's not a ground loop issue. 5Amps and 9VAC at 1 Amp Can produce many problems like blank screen (red power LED on, dim or off), program lock-up, “garbage” screen, hum bars moving on screen, hum in The 1700 and 1750, 128K and 512K units intended for the C128, are said to work more reliably with the SX-64 than the 1764 unit that was intended for the regular C64. Commodore's original power supplies like to blow up your Commodore 64 as they age. Report an issue with this product. Communities where you can ask for help with your C64 issues: Lemon64 forums; Comp. Some recommend dropping them altogether and using newer replacements instead. New C64 power supply will cost you more than buying used C64 with used power supply. I did make a couple mistake, one no spot for a parallel resistor as C64 Power Supply . spannernick Zorro Posts: 1146 Joined: Thu Mar 29, 2012 2:53 pm Location: London,UK Age: 53. or if it was a country of manufacture related Found your power supply it was designed by William Levak at Commodore for the Commodore 64, the part number for the power supply is 902503-02. Power Tester for Commodore 64 and VC-20 ; Additional input for testing the FDD 1541-II/1571-II/1581 power supply ; Forces a constant current from the 5V DC and 9V AC power supply outputs. In this video, I do a teard Definitely something on the c64 side then. I was pleasantly surprised to find that the power supply checks out as functioning perfectly on both the 5V DC and 9V AC connections, but unfortunately it gives me a black screen most of the time when turned on, and occasionally a garbage screen. 96 V DC (which is good), but instead of 9V Replacing the original Commodore 64 power supply may be the single most valuable step to prolong the life of the old hardware! The main issue with the original C64 power supplies is the 5V line. i'll bet at least 90% of C64 users these days are still using brick power supplies with no issues. The rise time of any likely overvoltage is far slower than the propagation delay of that rise across these traces (the propagation delay through the traces will be in the order of tens of ns whilst the risetime of an The vast majority of these power supplies is recognizable by general-purpose plastic enclosures and internal components wired up in a true DIY style. An alternative to protecting your Commodore 64 from power surge when using an original power supply - costs less than a modern power supply. 6v. I just tested the voltage and it is outputting 4. I’ve seen some debate about using switching power supplies vs using traditional linear power supplies. I added 3 overvoltage protections based on MC3423: 1) 5. All the sources of information I've found have been very conflicting (been researching for a few days). UPDATE, 6 Mar 2021: I've solved this problem. Designed specifically for C64 and VIC-20 systems to preserve them in a pristine condition for years to So completely external to the existing supply. 5A, which is quite questionable. Or if you have your original supply, run a power saver device Owners of a C64 using an original power supply should regularly (for example, once a year) check the 5V DC function of their power supplies, as they tend to produce higher voltages as they wear out. I have a box chock full of working original C64 power supplies, which is the main reason I wanted to build the SaV64. It is still recommended to use a saver device with the VIC-20CR with round din as the 5v in the PSU can fail and provide over voltage. It's an online C64 repair bible. 6"). It should be possible to load the 5 Volt of the external power supply with at least 1. I never use switching power supplies (or modules) in retro gear. com FREE DELIVERY possible on eligible purchases. My current best approach to suggest is to use the Electroware C64 PSU(s). It was enough of an issue that we would ask the customers to bring in their PSU to test, Im still using the old brick of death power supply , About this item . As stated in the video, I am not affiliate Power supply (PSU) issues. Does anyone by chance know if a flashing light on a Commodore 128 is a symptom of a bad power supply, or other power issue? The VIC-20, C64, Commodore 1902 monitor, Commodore 1571 floppy drive, Commodore CN2 Cassette, and the Apple IIc with monitor I acquired in the bundle all work fine. I personally use a 128 power supply on my C64 computers and I have no issues with the 1541 UII. 44W $$ Consequently, power dissipated in the regulator has fallen to: $$ P_{U1} = 125mA \times 3. I had some weird issues with on C64 related to the power switch. Hello all, I was going through my old C64 stuff at my parent's house and I stumbled across my C64's original power supply and then the new one we had to buy. , Canada, Mexico, Japan, and others) › Also consider some Atari power supplies which also generate 9VAC at higher wattages. Inside the C64 these components are all on the same supply rail and are connected together by wires and PCB traces of largely negligible resistance. I'm trying to find a range of voltages that are safe, sort of like a GO/NO GO gauge for my supply. After my C64 has been on for several hours, I open it up and check them and they are barely warm. Commodore International was an American home computer and electronics manufacturer founded by Jack Tramiel. Reviewed in the United States on January 11, 2024. For even more reference, Google "Ray Carlsen Commodore" and read his posts on repairing a variety of C64 issues. 2: The DC-DC converters are definitely the way So this is embarassing- I'm working on restoring an old C64 (250425) and I was ready to face many issues- the power supply was dead, I got a new one- I have a spare PLA and a dead test since in general those are the issues I've faced before. 5VA and not 7. Replacement power supply for Commodore 64 and VIC-20 Stabilized 5V/2. 92A. 4v dc is safe, and 8-11v AC is Only now that I look up "c64 power supply" on eBay do I see that the power supply I have looks like a crusty bomb in comparison. In your case, likely the voltage regulator has failed and I think you should consider yourself lucky that it didn't kill your C64, which is what these power supplies often do. Here is what I have come up with. The power supply unit installed in a desktop PC has a capacity of Hi all! I just acquired my first real C64 (I previously had a DTV unit) yesterday. There were 110v and 220v power supplies for the C64 and the power supply drops the voltages and type down to the voltages needed for the C64. They kill C64's in many ways. This The C64 PSUfrom Eletroware comes in a small cardboard box with a small booklet with instructions for proper use. This power supply is repairable/revisable. Search syntax tips. Seems the first logical thing to do is replace the power supply. Our C64 PSU is modern, replacement power supply unit for Commodore C64 and VIC20. Converts power plug pinout from C128 to C64 ; Conveys 9V AC and +5V DC ; Round DIN7 plug (male) and square DIN5 plug (female) For use exclusively with Commodore 64 and 128 RetroPower PSU C64 OLED Digital International - Replacement Commodore 64 Power Supply. reddit C64 power supplies are ancient, they go bad every day so use protection! - Issues · tebl/C64-Power-Saver I picked up a bread bin C64 recently, and I'm building a new power supply for it. Personally, I have been repairing commodores for years and haven't run across one yet. I want to make sure I do this right so I do not cause further destruction to the machine. In which the author discusses the very simple repair of his repairable power supply. Buy C64 PSU Modern Gray US - Replacement Commodore 64 Power Supply, US Plug: Internal Power Supplies - Amazon. It's a lot lighter and more compact than the original C64 power supplies. Maybe a new power supply is in order. Replacement power supply for Commodore 64 and VIC-20 Do You get +5v from the power supply at the switch with it in the "off" position. 5A, the 9V AC from the transformer is rectified by 1A diodes and thus these diodes are overloaded, often causing burn marks on the PCB and is a reason for failures. The Pictorial C64 Fault Guide General tips - Power supply (PSU) It's advisable to at least check your PSU voltages before putting it to actual use, as sometimes its failure can result in overvoltage and kill chips inside a C64. Repairing my repairable C64 power supply. 4" x 2. They supply a more correct AC voltage It should be noted though that there are some concerns in the community about there potentially being ripple on the supply due to the to separate supplies not having a fused ground inside the supplies themselves (like you would get from having a single transformer design), but the grounds are fused within the c64 motherboard's power supply circuitry and the C64 Over-Voltage Protection Recently, I purchased a Commodore 64 with the original power supply. 50/Unit) Free postage. Forces a constant current from the power supply and measures voltage level and ripple. Post by JoeG » Tue Feb 20, 2024 1:09 am. 7v Your PSU is suspect, if 5v Your c64 is somewhere pulling down the +5v. NTSC Power dissipated in the resistor is: $$ P_{R1} = 125mA \times 3. SO long story short and kind of cringeworthy I am sure, I had my Commodore 64 Breadbin Rev B repaired by ray carlson a couple of years ago and I purchased one of his home made power supply. 5V is the max rated voltage of C64 components idflyfish wrote:From Carlsen Electronics "A TESTER FOR THE C64 POWER SUPPLY ""Loss of the 9 volts AC will not damage the computer. The V is missing in the rating on the schematic it's 7. Post by r. I posted about the issue's it is having over on the AtariAge forum. 7v-5. £14. For more current DC-DC converter should be changed or heatsinked. Usually being potted, you cant replace that regulator. I just vaguely recall issues back then with some hacked/modified 1541 drives. They produce very little heat, and are much smaller than the Recomm replacements that people seem to use as replacements. There are tons of options for new modern power supplies, some of which are quite cheap. and all the files to make your own are provided publicly and free of charge: Documentation (pdf): High-quality Commodore 64 replacement power supply unit (PSU). This page describes how to fix your power supply. I’m really excited to get to using the c64 😁 Quick PSU diagnostics. When I switched to better one picture cleared. Based on this well known guy's design Had a lot of power supplies and C64 to test and I wanted something in there to protect the 64 from flaky power supplies. My rule of thumb is if it originally used a linear supply, stay with a linear supply. Suitable for many available 3d-printed enclosures available on web. This site is dedicated to users of 8 bit Commodore Computer hardware. Statistically, you should be fine to use your old Commie with old power supply for few years. If You get 4. From what I have heard, these power old supplies commonly fail and output a high voltage. These are memories from back from my college days when I was using GeoWrite for word processing when everyone else was using WordStar. UPDATE: The have been some reports of issues using the Keelog PSU. a I have a C64 power supply which was made by a company in Poland. I also tried using an LCD TV that had a C64 - Black screen, looks like a power issue. So that may be the core issue. Find a working C128 supply and swap a C64 cable onto it. Power supply failures are among the most common problems among all retro computer systems. Cheers, Oge. The main issue with the old power supplies is the 5V regulator. This item: C64 PSU Modern Black US - Replacement Commodore 64 Power Supply Stabilized and filtered +5V/2. Or if you're lucky use the power supply Commodore shipped with the 1764 REU, that's essentially a 128 power supply with a plug for the 64. Modern style chassis. Follow the Commodore spec for your connections, using a multimeter for confirmation, as the wire colors may not always be correct. Replacement power supply for Commodore 64 and VIC-20 WARNING C64 Brick of “Death” Power Supply. 9") resembles the original power supply series. The video output is showing some faint "ripples" running vertically down the screen. To do so, refer to the power supply connector pinout and use a tester. In a nutshell, the voltage regulator on the 5 volt DC output tends to fail in such a way that it lets a voltage spike go straight to your C64 motherboard, frying the precious chips. The power supply normally produces a voltage slightly higher than 5V, because of a small resistor between the voltage regulator and ground in the power supply. It only conveys +5V DC and 9V AC power, and does not guarantee sufficient current output of the attached power supply. If it were an issue with the VIC-2, Since coming out of 20 year old storage it only ever used a brand new power supply. Dual power supply supports both C64 and FDD 1541-II series. Considering that little software outside of GEOS even uses the The standard C64 PSU model is a brand new replacement power supply for the Commodore 64 (and Commodore VIC20) home computers. The front of the device holds a red ON/OFF switch. I got both C64's without power supplies for $100, plus tax of 7. groepaz Usagi Yojimbo It seems when these Atari XL / XE Power supplies were made, Early C64 PSUs did not Hey everyone, After moving my C64 gear to another room and setting all the drives and C64 back up I was looking at all the power supplies, Personally I didn't see it being an issue as I have used an ATX power supply to run a hard drive and some other equipment on a test bench and it never gave me any problems. To test your In your case, likely the voltage regulator has failed and I think you should consider yourself lucky that it didn't kill your C64, which is what these power supplies often do. Got my old C64 out. I have a voltage monitor on my C64, and this power supply hums along at 5. Having said that, it is probably one of the most overthought, overengineered components as well. On the subject of the tape drive, tapes were not a big thing here in the States, but I know a LOT of cool games came out in Europe on tape and I The vast majority of these power supplies is recognizable by general-purpose plastic enclosures and internal components wired up in a true DIY style. Curious - if it's so easy to build a proper C64 power supply, then why on Lemon64 and other dedicated forums are there literally dozens of threads with people looking for a good, pcwzrd13 wrote:So I noticed a slight issue with my power supply today. Switchers are more reliable and much less prone to catastrophic failures but can still cause damage to the computer if they fail. 44W $$ That's a much more reasonable power for the regulator to Switching vs linear power supplies for the C-64. Top. 96 V DC (which is good), but instead of 9V A friend of a friend brought this C64 to me, they had pulled it out of the attic and were playing some games for an hour or so with no issues when they heard a buzz sound from the power supply and it shut off. Jeffrey. It is all integrated into small enclosure and dimensions similar to the original Commodore PSU. I sure hope that The power supply is one of the most integral part of any electronic circuit. The reason? I accidentally plugged in the wrong power supply. 2 people found this helpful. C64 and VIC-20 Power Supply (Modern Replacement) These power supplies are produced by Electroware. The original c64 power supply itself only delivers up to 1. It simply replaces the original (and unreliable!!) Commodore power supplies. Manage code changes In case you need to operate the power supply in higher ambient I recently purchased a Commodore 64 off eBay. From personal experience (and I would be very very happy to be proven otherwise) finding a 9V AC supply is both difficult and expensive. 75%. Replacement power supply for Commodore 64 and VIC-20 The plot thickens. Has protection solutions, so it will not blow up your C64. It will cut the 5v rail to the computer in case of an over voltage. POWER PACK: +5VDC at 1. Check voltages, voltages were way too high on mine which caused issues with my c64. They tended to fail in a bad way, 2. As long as I get the right voltages when testing with the switch set to off position, would it be safe to turn the C64 on and do the further tests? This C64 isn’t producing any video output at all. Made on quality parts such as a factory AC/DC and transformer. The C64s worldwide has the same power requirements, it was the power supply that differed. . SMPSU noise isn't the major issue, its the leakage current through the class Y capacitor that is commonly fitted from 0V on the secondary side side of the SMPSU to the negative of its primary side DC bus. " I am testing the power supply by placing the multimeter probes directly on pins 6 and 7 while the power supply is plugged into a power strip. Commodore International (CI), along The C64-Plus/4 power adapter is intended for use only with Commodore C64 and Plus/4 systems. Except noise and interference from bad quality 5V PSU. Some SX-64 owners modify Commodore REUs to use an external power This is a project I've been working on for the past few months: an efficient C64 power supply with an emphasis on PROTECTION. First, if your C64 has MT brand memory chips, suspect those as being the cause. Opening up a few of those power supplies was big motivation for us to design our Commodore C64, C128, Amiga, Atari, ZX Spectrum, Sinclair QL, TI-99/4A, and ColecoVision power supply series. Keelog (in Europe) makes good replacements. Try leaving your C64 power switch on, and only switch it on and off using a power strip. One of the ways the Commodore "brick" power supply can fail is from a shorted internal 5 volt regulator. The reason is they have to be completely galvanically separated as the AC 9V is later used to generate 12V DC inside the C64 (see my other article about the internal power supply). My intention (as always) was to use my modern replacement and test the original one properly later, but it only took a tiny slip and I popped in the original PSU connector and (as expected) The reason why the C64 power supply damages C64's when it fails is because of a voltage regulator that fails inside the brick. There are four pins/holes at these connectors, with four wires to the supply. When it fails one of the voltages, I forget which, jumps up to a C64 killing level. bwack Source and The vast majority of these power supplies is recognizable by general-purpose plastic enclosures and internal components wired up in a true DIY style. Here are some answers. This was designed by my long time supporter S. Another common power problem is a wonky power switch that doesn't The original power supply of my C64 was broken. They are notorious for being horrible chips and can cause the diagnostic cartridge to show strange results. 50 (£14. 10 Volt, else the C64 will not work properly. So, I've just bought a C64 at a flea market and it was said to have a faulty datassette reader. A C128 power supply is a great option. Or if you have your original supply, run a power saver device with it. Designed specifically for C64 and VIC-20 systems to preserve them in a pristine condition for years to come. 0 out of 5 stars Caution - Potential Overvoltage Issue with C64 PSU Modern Black US. Provides stable filtered 5VDC (up to 4. One way to do this would be a “crowbar” circuit that blows a fuse in case of an over-voltage. Our stylish C64 power supply should keep your Commodore64 running for another 40+ years. Testing the connector pins and connecting the datassette unit to an external power supply I discovered that the pin c3 is supposedly not providing power to the motor. Runs cold. One of the C64's came with a working SD2IEC+, a Jupiter Lander cartridge, and a C64 diagnostics card. C64 Datassette power issue . This issue however is new to me- I have no video signal at all. D. I have a C64 power supply which was made by a company in Poland. 96 V DC (which is good), but instead of 9V High-quality Commodore 64 replacement power supply unit (PSU). KISS comes to mind. 7 kg (1. The power supply that came with the 1764 REU (RAM Expansion Unit) for the C64 is identical to the PSU that shipped with the C128. The cable by itself isn't known to have problem, only those that are inside the brick. Just be sure to get a 5VDC and 9VAC power supply that you know are good quality to use along with it. 0" x 2. Here’s the files for the Commodore 64 power supply I built in this video. So I picked up a clean C64 unit that was in someone's closet for years with little use but I don't want to power up given all the power supply horror stories. At best that is a quality refurbishment of an old power supply. The My issue is that I have four C64s (2 x breadbin + 2 x C64C) which all display a kind of rolling interference when I power them using my newly acquired Keelog PSU. 4 lb) Custom designed high quality enclosure 158 mm x 71 mm x 51 mm (6. And use the original power supplies for doorstops only. Ideally you would test the power supply both open circuit (no load attached) and then with a dummy load (power resistors selected to draw close to maximum amount of current the supply can put out. Read more. Frequently bought together. mathop Joe Blade Posts: 251 Joined: Sat Mar 04, 2017 12:43 pm. Schematic, BOM and gerber files are freely available at: (linear) supply a few years ago and Dual power supply supports both C64 and FDD 1541-II series Compact enclosure with modern shape 125 mm x 59 mm x 42 mm (5. In figure_2 you can see one of these standard cords. I am very aware that the original C64s power supplies were deathtraps with high possibility of causing damage to the C64s. They ship DHL to the US. I am very green with electronics (still learning slowly after all these years) but I am guessing that perhaps these power supplies are built in such a way that they don't connect any lines unless connected into a c64 power socket? [fig2: PC power supply connector] After soldering the three power wires (+5V, +12V, and gnd) to the 1541 PCB, we need to connect them to corresponding pins of PC power supply cords. The third solution is to add the missing over-voltage protection between the power supply and the C64. Sometime in the last couple of months one of the plugs to the power supply was severed not knowing this i turned the C64 on and then it did this: Awesome! Thank you for the info about the joystick port, I never would have guessed! I ordered a new PSU (that I’ll keep in a switchable power strip) and now am waiting for both the computer and the power supply to come in. Got a new power supply for it. Stabilized and filtered +5V/2. I had been doing consumer electronics repair work since 1964. M. A picture of the power pack and the schematic from Zimmers site. Contribute to Statik8bit/C64-power-supply-Pi-case development by creating an account on GitHub. The C64 PSU chassis are available in colors black and gray. Well, I'm back from the Real It also occurs to me that perhaps the C64 is having some sort of issue with the high frequency the converter uses, and perhaps that's why it isn't working properly. 0A!) by industrial grade AC/DC power supply and full 9VAC (1,11A max) provided by classic heavy duty linear transformer unit. Click & Collect. g. When it eventually fails (and it will!), from e. Buy commodore 64 power supply products and get the best deals at the lowest prices on eBay! Commodore 64 (C64) or VIC 20 Power Supply (PSU) With A Sensory Issue. They are very reliable and, unlike the original Commodore 64 and VIC-20 power supplies, will not fail in a way that destroys your computer! We highly recommend using these with vintage Commodore 64 and VIC-20 (with the r The C64 FDD dual power supply has a chassis design called Modern (as opposed to our C64 Classic series), and resembles a modern power supply with a slick shape of 125 mm x 59 mm x 42 mm (5. 5V = 0. 96 V DC (which is good), but instead of 9V The C64 FDD dual power supply has a chassis design called Modern (as opposed to our C64 Classic series), and resembles a modern power supply with a slick shape of 125 mm x 59 mm x 42 mm (5. RAM, or maybe your 6502 processor are dead when over The old Commodore 64 power supplies are prone to failure with over-voltage on the 5V line that will destroy your computer. Include my email address so I can be contacted. Provide feedback We read every piece of feedback, and take your input very seriously. You have options here, either make your own from scratch, buy a new modern replacement, or use the old one by swapping in a That's why I tried with my makeshift power supply and it booted fine. Helpful. WARNING C64 Brick of “Death” Power Supply. cbm; C128. 1: You can not use the AC 9V to power any of the DC 5V circuit. Looking for the perfect C64 PSU ? You have found it! Features: - OLED Display - Touch Sensor. our C64 / C128 power supplies resemble a modern power supply with a slick shape of 125 mm x 59 mm x 42 mm (5. But, I would not try this with the cart plugged into the C64. This over-voltage protection unit is designed to prevent damage to the Commodore 64 computer due to a failing power supply. I didn't really see any solid solutions though. It will not increase the amps you can get out of the original power supply so hardware hackers loading down their C64 with many accessories will probably need a new power supply with a higher spec. BOSCH Inverters - The company is now doing these systems, due to supply chain issues with Carrier. I have tried the power supply with a different c64 and it works, so the power supply isn't the issue. 3" x 1. No easy way if the c64 is the problem, just have to isolate parts till You find the problem. By 1985 just about any C= magazine would carry ads for replacement and / or repairable PSU. New Model Choice of UK, Europe & So, the other day whilst (admittedly) working in a messy environment, I managed to fry some RAM chips in my C64. However they may be just as rare as the VIC-20 one. I have another power supply that's causing some pretty good interference on the computer it's used on. 95 to 5. Are there any issues with the C128 Power supplies or maybe it is about time to start looking for an "Aftermarket" Power supply? If I am not mistaken the C128 Power supply can provide more current that the stock C64 PS Hi Antonio, thanks for the comment. Heather. Collection of links and articles about the famous PET, VIC, C64, C128, TED, Amiga and PC Commodore machines. Link to buy one enjoy. A failing PSU is one of the reasons why the computer won’t turn on. High-quality Commodore 64 replacement power supply unit (PSU). My concern is that the C64 I got has the original power supply. Repairing such a mess seemed Find a working C128 supply and swap a C64 cable onto it. cade » Mon Nov 11, a real problem (I worked in repair in the early 90's) but it wasn't like every PSU failed this way. Finally, you could use a 5 volt DC 2A phone charger to replace just the 5 volt supply at the power supply if you have no money to buy a new power supply. For help with C64 hardware, software etc. I've bought several from them. Unfortunately it was one of those power supplies where everything inside the case has been glued into one big block filling the entire case. I looked this up and it seems to be a common issue with homemade power supplies. eightbitswide Mikie Posts: 470 Joined: Sun Oct 02, 2016 3:01 pm Age: 53. C64 power supplies were made by at least three manufacturers. 7A @ 5V and 1A @ 9V. Because the C64 almost directly I pulled my favorite C64 out of its dusty box and I have read of issues with the factory power supplies going bad in their age and in so doing upping the DC 5v output line to A workaround is to insert a reliable 5V DC supply to the power cord, whilst retaining the 9V AC supply from the original power pack. 30A to 0. de (German) Informative C64 repair videos: Jan Beta; Adrian's Digital Basement; GadgetUK164; KOJRO Retro Innovations; If you found this site useful, you can show your support here. Report. Switching power supplies are more efficient, so they run cooler and last longer. but i think this is a bit overblown. The power supply contains 1A diodes without any cooling, while it is rated for 1. The 9 Volt alternating current (AC) is the reference frequency for the internal clock and - after being rectified - it is used to power the SID chip (9 or 12 Volts), partially also the old version (NMOS) of the VIC-II chip as well as the motor of the Datasette (6 Volts). The power supply was a "heavy duty" power supply that some one built to power a C64 and a These types of solutions work great if you want to forego a power saver. C64 power supplies are ancient, they go bad every day so use protection! - tebl/C64-Power-Saver. 14 volts DC constantly. With a multi-meter and this set up you can get an idea if the voltage output is 'OK', and stays 'OK' for 10-15 minutes of use (the voltage can spike up as the power supply I bought a Commodore 64 on ebay and I've had it for a little while and love it! But I noticed that if I leave it running for two long it will freeze up and t Imgur. A c64 A new power supply A pi1541 But I have these, Yes, the power supply is an issue, don't use an original power supply. After watching Jan Beta's 25 Nov 2020 YouTube video on building a replacement C64 Power Supply, I thought that THIS was the next project for me. Or if you like soldering and tinkering, get a 5V DC wall wart with about 2 amps (or more if you plan on putting lots of crap on the expansion bus), then carefully slice open the brick's power cable and disconnect the Commodore side and solder in I tried another supply, same result on the c64, and same result on measuring the pinouts. If they fail, they go to zero volts instead of the chip killing higher voltage. 5A. 5V trip 120 us delayed to avoid small spikes to trigger overvoltage protection (OVP). Commodore 64 Power Supply - C64 PSU, (UK 230VAC plug), Black, LED, Power supply (PSU) issues. Commodore used switching modules in its heavy duty power supplies, so I see no reason to not use them today. 1A AC output Over-voltage and over-current protection Fused on AC and DC side and fully isolated On/off AC switch on rear side Output voltages on universal DIN socket Output power cable included with DIN plugs High A replacement PSU for the Commodore C64, which works with 230V/115V - svenpetersen1965 Issues. I've heard of people Regardless of the reasons as to why, almost 2 or 3 years after the release of the C64 the issues with the power supply were already well known. The C64 power supply not only generates a lot of heat (it is very inefficient) and easily overheats itself, but also suffers from underdimensioned components: While the power supply is rated at 1. Save those precious C64 chips from certain doom! edit: sounds like your black-screen is due, so far, to incorrect video hookup, as diagnosed elsewhere in the comments. Another one would be the After-market power supplies, even switching types, can fail at any time. Search the web generally regarding the c64 power supply issue. This Saver is designed to The power supply has a sturdy custom-made chassis with an OLED digital display monitoring the output voltage and uptime. I bought a Commodore 64 on ebay and I've had it for a little while and love it! But I noticed that if I leave it running for two long it will freeze up and t With all the threads alately about replacing the ticking time bomb which is the C64 PSU I got on to thinking about the one for the 1541 The 1541-II power supplies are prone to failure, but unlikely to do any damage to the To my surprise the ICs were rugged enough to survive but surely the issue reduced their lifespan Good C64 OEM power supplies are getting more and more rare as they age, as we all know. So the fault is in the c64. Plus the block is already bulging on the bottom. They unplugged and The 5v current on my power supply dropped from ~1. Have a look at our wiki: https://www. 230V AC I have a C64 power supply which was made by a company in Poland. Opening up a few of those power supplies was big motivation for us to design our I have a C64 power supply which was made by a company in Poland. 0A DC output with anti I bought a Commodore 64 on ebay and I've had it for a little while and love it! But I noticed that if I leave it running for two long it will freeze up and t Dual power supply supports both C64 and FDD 1541-II series ; Compact enclosure with modern shape 125 mm x 59 mm x 42 mm (5. The problem is with the Commodore 64 itself. What could it be? Suggestions on the back of an envelope please. Diagnosing a PSU failure can prevent expensive repairs or even save your hardware from a total damage. the power supply is good? Please check that the power supply has both 5V DC and 9V AC. Pay great attention not to short-circuit anything, as on later C64 In fact Ray Carlsen has stated that the VIC draws more power on the 5v line then the 64 does so if the PSU is having any issues with power it may still work on a 64 but not on a VIC. Yes, C64 DIN power is identical to VIC-20, except for the power supplies are rated for higher ampere so it will last longer and can take more load. Notes. 6") Round DIN7 plug for C64 and DIN4 plug for FDD The 5V DC voltage should fluctuate in a range of 4. I'd guess an issue with the RF module. Opening up a few of those power supplies was big motivation for us to design our The epoxy resin was only good at giving heat issues and making the components die sooner. I already C64 power supply which hasn't been used in years. When the device is turned on, a green LED lights up inside the case which can bee seen through the venting holes on the side of the unit. 1A AC ensure continued error-free operation of your C64. Cheap and good solution to produce new power supplies for C64. For the Commodore side of the connector, you can make your own cable with a 7-pin DIN, or cut the end off an old failed power supply. Please see the pinned comment for more details. Before chucking the old black brick, cut off the power cable and use them on new power supplies so you don't need to find the right plug or solder the plug end in. Post by eightbitswide » Mon Oct 30, 2017 12:54 pm. 5Amps and 9VAC at 1 Amp Can produce many problems like blank screen (red power LED on, dim or off), program lock-up, “garbage” screen, hum bars moving on He starts with the power off and then turns it on and keeps on measuring voltages. You will be able to unplug and use the "Jackulator" as I am calling it with any C64 power supply. I have these two wall warts: The SaV64 is designed to be used with the original C64 power supply. I've basically ruled out scan converters, monitors, power strips, cables by moving the poor machines around to different displays while at the same time building 4(!!!) s-video cables and also buying 2 High-quality Commodore 64 replacement power supply unit (PSU) with an additional power output for an FDD 1541-II/1571-II/1581. Plan and track work Code Review. 5 Ampere. I would personally have lik You can try re-seating the plug and wiggling the wire as well - often they can be the culprit instead of the supply itself. That fault puts excessive voltage into the computer and damages chips such as RAM very quickly and silently. That voltage will never be high or low it's there or it isn't. A reliable new Commodore 64 power supply has arrived. Using a dual power supply solution with the SaV64 is just a feature. 0A DC along with 9V/1. I'd expect the only issue to be the TOD clock running slightly slower or faster than normal. New Commodore 64 power supply solution, looking almost the same as original part. Any comments on typical issues would be great. Most of the c64 power saver designs cut power around 5. The results are displayed in real time on a digital OLED display. Modern power supply unit PSU for your vintage Commodore computer system. 6") Round DIN7 plug for C64 and DIN4 plug for FDD ; US-standard 120V AC power plug (U. com forums; Forum64. sys. Here, I will explain in detail the most common signs of a power supply failure that will occur if the power supply unit going bad or fails as well as the reasons behind it and how you can extend the life of the power supply unit. A common reply to anyone posting here about finding a C64 is: Ditch the power supply! Don't use the original power supply! However, the only part of the original power supply to fail is the 5V DC circuit. The 1581 I think has full access to its components so these parts can be replaced. The stock power supply is known for going catastrophically bad and damaging the C64. I think my problem comes from either dodgy power socket on New replacement power supplies: click here for photos of new custom-built replacements The C64 Computer "Saver", power adapters and A/V cables: click here for photos. Joe 02-19-2023, 10:57 PM . 8" x 2. 8" x 1. Power supply delivers current well slighlty higher than 2 A from 5V line. Check out Ebay, search for "c64 over voltage" and you'll see what I mean. Weight only 0. But I am wondering if these are too good to be true. An over-voltage protection circuit could save my whole computer, so I Umbrel Node Issues upvote The original C64 power supply provides 9V AC and 5V DC. The second is called Modern, and resembles a modern power supply with a slicker shape of 125 mm x 59 mm x 42 mm (5. Pre-owned · Commodore. Our power supply tester series for Commodore C64, C128, Amiga 500/500+/600/1200, Atari XL/XE, and ZX Spectrum +2A/+2B/+3 was created specifically to address this issue. ybrv jrbtnmd ntivrrwvv dkivc vtv pad iuklwcs olxdh rdx jdqaj