+eebuckeye Posted January 30, 2016 Share Posted January 30, 2016 I picked up a couple systems that are having problems and i want to see if the power supply is ok. Can I measure the voltage on the power supply pins with it plugged in and not connected to the computer? What pins do I need to check and what is the expected values? I have a 4 pin supply PN 251053-02. Thanks! Quote Link to comment Share on other sites More sharing options...
7800fan Posted January 30, 2016 Share Posted January 30, 2016 If it's a black brick and it doesn't have any screw you can take out, check it in the dumpster and don't check it out. You could also buy or build a C64 saver which will monitor the 5v line and stop the 5v rail if it goes up due to failed part. 1 Quote Link to comment Share on other sites More sharing options...
Guest LiqMat Posted January 30, 2016 Share Posted January 30, 2016 (edited) multimeter http://www.hardwarebook.info/C64_Power_Supply Edited January 30, 2016 by LiqMat Quote Link to comment Share on other sites More sharing options...
+eebuckeye Posted January 30, 2016 Author Share Posted January 30, 2016 Excellent - thanks! Quote Link to comment Share on other sites More sharing options...
motrucker Posted January 31, 2016 Share Posted January 31, 2016 (edited) If it's a black brick and it doesn't have any screw you can take out, check it in the dumpster and don't check it out. You could also buy or build a C64 saver which will monitor the 5v line and stop the 5v rail if it goes up due to failed part. An excellent answer! If you feel that you must check the PSU, make sure you do so with a load, or you won't get a usable answer. Indeed, if these are the old "black box" PSU (or the equivalent) I would advise against using them at all. They will destroy your C-64. I would rather go the el-cheapo, two wall wart idea that has been covered on so many forums. Sounds awful, but if you buy good wall wart PSUs. I don't know where you're located, but if in the U.S., use PSUs From this distributor: http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_379623_-1 for the 5vdc side, and this for the 9vac side: http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_112336_-1 This will give you and excellent C-64 PSU, at a very good price (for a new PSU!) Jameco.com is an excellent source for electronics hardware. Edited January 31, 2016 by motrucker 1 Quote Link to comment Share on other sites More sharing options...
7800fan Posted January 31, 2016 Share Posted January 31, 2016 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. The cable by itself isn't known to have problem, only those that are inside the brick. 1 Quote Link to comment Share on other sites More sharing options...
motrucker Posted February 3, 2016 Share Posted February 3, 2016 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. The cable by itself isn't known to have problem, only those that are inside the brick. Good point. These cables can be used with anything from the wallwarts, to a C-128 PSU to work with a C-64. Quote Link to comment Share on other sites More sharing options...
danny_galaga Posted February 3, 2016 Share Posted February 3, 2016 Good part of the 2 x wall wart set up is that there's a chance you have something kicking around already. It pays to only have a good quality 5V supply, like motrucker linked to, but the 9V side isn't critical. If you have a NES for instance, there's your 9V supply right there (9V, 1 amp). That's the same as some of the originals which is fine so long as you aren't attaching lots of power hungry devices to your C64. Also, of course you can use the 9V part of your original supply quite safely which means only having to get a 5V supply. I even managed to put a 5V USB supply inside a wedge PSU recently! I think the main disadvantage of the 2 wallwart setup is purely cosmetic. If you can live with that, you're golden. Quote Link to comment Share on other sites More sharing options...
Charlie_ Posted February 3, 2016 Share Posted February 3, 2016 I recently picked up a Maxtron PS-01 to replace a failed c= brick. Is this Maxtron known to be a good 3rd party supply? Quote Link to comment Share on other sites More sharing options...
motrucker Posted February 5, 2016 Share Posted February 5, 2016 I recently picked up a Maxtron PS-01 to replace a failed c= brick. Is this Maxtron known to be a good 3rd party supply? I've seen these, but never used one. Can you open it up to check the inner works? I would want to nose around inside first. Darn, just answered that question: http://www.lemon64.com/forum/viewtopic.php?p=661969 Quote Link to comment Share on other sites More sharing options...
RobertB Posted February 6, 2016 Share Posted February 6, 2016 Charlie_ wrote: > Is this Maxtron known to be a good 3rd party supply? I've never had a problem with the Maxtron that I have. However, I'd rather use the something more powerful, like the heavy-duty Commodore p.s. or the Ray Carlsen deluxe C= p.s.. Truly, Robert Bernardo Fresno Commodore User Group http://www.dickestel.com/fcug.htm Quote Link to comment Share on other sites More sharing options...
motrucker Posted February 8, 2016 Share Posted February 8, 2016 Charlie_ wrote: > Is this Maxtron known to be a good 3rd party supply? I've never had a problem with the Maxtron that I have. However, I'd rather use the something more powerful, like the heavy-duty Commodore p.s. or the Ray Carlsen deluxe C= p.s.. Truly, Robert Bernardo Fresno Commodore User Group http://www.dickestel.com/fcug.htm I still use a Commodore 1764 PSU on one 64, and a C-128 PSU with a C-64 pigtail on it for another, since I use upgraded C= REUs quite often. What ever happened to Jim Brain & Bill Herd's C-64 PSU project? It been a long time with no word......... Quote Link to comment Share on other sites More sharing options...
carlsson Posted February 8, 2016 Share Posted February 8, 2016 In the mean time, a new design has arrived: http://pdp-9.net/c64-power-supply 1 Quote Link to comment Share on other sites More sharing options...
Muzz73 Posted February 8, 2016 Share Posted February 8, 2016 It's already been said (in essence), but my opinion on stock Commodore PSU's: hold the ends of both cords, swing it around like the hammer throw in the Summer Olympics and let go. This provides some physical exercise, it helps with the hand/eye coordination and is more amusing than plugging it in and watching your SID chip slag. Quote Link to comment Share on other sites More sharing options...
danny_galaga Posted February 10, 2016 Share Posted February 10, 2016 In the mean time, a new design has arrived: http://pdp-9.net/c64-power-supply Nice. I like the relay idea. I had thought about it but assumed using a relay was too crude an idea. This looks great (",) Quote Link to comment Share on other sites More sharing options...
motrucker Posted February 15, 2016 Share Posted February 15, 2016 In the mean time, a new design has arrived: http://pdp-9.net/c64-power-supply Looks interesting, but it also looks like it will not help North American users. That's a shame. Quote Link to comment Share on other sites More sharing options...
carlsson Posted February 15, 2016 Share Posted February 15, 2016 Not all is lost. I asked the designer, and if the primary side of the transformer (2x115VAC) would be connected in parallel instead of series, it should be possible to use the design for North America too. The transformer is even specified to handle either 50 or 60 Hz. Due to space limitations, he didn't add the option to switch the power supply between 115V or 230V. Quote Link to comment Share on other sites More sharing options...
sparkdrummer Posted February 22, 2016 Share Posted February 22, 2016 I recently discovered that I have a Recoton power supply for a C-64. Are these decent? I also would like to ask about what type of female din connector I should use to make an adapter to power my 2 pin VIC 20. I have seen 4 pin and 7 pin hat look like thet would work ok, but I'm not sure. Quote Link to comment Share on other sites More sharing options...
carlsson Posted February 22, 2016 Share Posted February 22, 2016 For an US two-prong VIC-20, supposedly a C1/C2 connector, the same kind that you might find on electric shavers, should fit. For European two-prongs, the pins are bigger and wider apart with a separator bar inbetween which makes it much harder to find a matching connector. Quote Link to comment Share on other sites More sharing options...
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