On 10/28/2016 08:35 PM, Jim Brain wrote: > On 10/28/2016 2:37 AM, Didier Derny wrote: >> Hi >> >> Is there any existing replacement for c64 power supply ? >> I have 2, one with round connector for c64 / vic 2 and one with square >> connector for plus4 >> both are heating like hell, in no time and have a really bad smell... >> >> I found one replacement on ebay but apparently not working in >> europe... I tried to contact the vendor but no answer... >> I found some people using 2 power supply 5v from usb and 9v ac from >> an external 9v ac power supply >> >> any way to produce the 9vac from DC ? >> there is the problem of galvanic isolation... >> >> -- >> didier >> >> >> >> Message was sent through the cbm-hackers mailing list > > Bil Herd (who lurks here) came up with an idea for such an option, using > 2 FETs, a small transformer, and a 5V PSU. As he's stepped away from > the effort, I am retooling it for a 12V switching PSU, which will > provide both voltages from a single 12 volt source. It'll have a small > time source to generate either 50Hz or 60Hz AC, selectable via > jumper/switch. > > Have not had time to work on it this year, but need to get it off my > bench... I found it easier to just open up the PSU, remove the rectifier, capacitor and 78S05 regulator. Then add a better rectifier, capacitor and a switching regulator. The latter you can get on a small PCB on ebay cheaply. I like the boards based on the MP1584. From the outside the result looks the same, the PSU no longer runs hot, you get the real 9V AC and, on the +5V, you get more than the 1.5A the old PSU gave you. Gerrit Message was sent through the cbm-hackers mailing listReceived on 2016-10-28 19:01:15
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