Date: 2004-01-10 16:52:08
Wow, that looks like a brick of epoxy! Umm... so it's not the "guitar pedal"-type C-64 PSU. What I meant by reverse-engineering, is: what "signals" it gives on the "output" and make a circuit that does the same. You don't need to know how it's made. If I understand correctly, it gives 9V AC and 5V DC regulated, right? First question that pops to mind: why didn't CBM simply make a PSU that contains a transformer and nothing more, which would give 9V AC, and then the rectification and regulation (to obtain 5V DC) would be done inside the C-64 ? Just look at how the C-16/C-116 is done. (actualy, there the PSU contains a transformer AND a diode bridge+electrolite capacitor, to rectify (but not regulate, yet) the AC to DC). Anyway, supposing a temporary engineering brainbarf on part of CBM, the PSU to make would be fairly simple, really. Check the ACCEL Schematic I attached here. > -----Original Message----- > From: firstname.lastname@example.org > [mailto:email@example.com]On Behalf Of ext Ryan Underwood > Sent: 10 January, 2004 14:26 > To: firstname.lastname@example.org > Subject: Re: C64 power supply replacement > > > On Sat, Jan 10, 2004 at 03:33:13AM +0200, > Gianmario.Scotti@nokia.com wrote: > > Hey Ryan, > > > > > > sorry to hear about your problems with the PSU. > > However, could you tell me more about this "Pinto" power supply? > > How does it blow up your C-64, exactly? > > I read on comp.sys.cbm archives that this power supply used a > rectifier > to cut the 9V down to 5V, and eventually due to heat/age, the > regulator would short and you would end up with 9V on the 5V output, > which isn't too nice to the C64 logic... > > > And, do you have pictures of this PSU, so I can be sure > which exactly you mean? > > Yeah, see here: > http://home.icequake.net/~nemesis/misc/c64-psu1.jpg > http://home.icequake.net/~nemesis/misc/c64-psu2.jpg > > This is after cracking the shell off and trying to chip some of the > epoxy off -- you can see a heat/ground plate exposed on the right side > of the picture. > > > I think it's simple to reverse engineer the PSU. > > I would think so too, if I had a way of getting rid of this brick of > epoxy without destroying the circuit.... > > -- > Ryan Underwood, <email@example.com> > Message was sent through the cbm-hackers mailing list
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