c64 power supply 5vdc?

[modularkomplex]

Hi,

I'm trying to get up the optimized power-suppy. While measuring the c64 power-supply I noticed that instead of 5vdc, 6,57vdc coming out. Is this a fault of the psu? Can I use this one anyway?

thanks in advance.

[Jaicen]

This is apparantly a common occurance with the old C64 PSU's.They have passive rectifiers and an RC network to filter and bring the voltage down to +5vDC. Over time the components wear out leading to higher voltages which results in lots of dead C64's with damaged RAM chips such as the one I just fixed. (I'll happily take any broken C64's and VIC's anyone has ;) ).

In the case of a power supply for the MIDIBox, the  voltages are being externally rectified using an LM317 (I think), which will rectify the voltages down to the correct level regardless of the input voltage (within reason). You could probably pump 9V at 1A through before it shut down, which it will as it's internally voltage and temperature protected.

In short, don't worry! As long as the rectifiers are in place nothing will get damaged.

[modularkomplex]

Thanks for replying!

Got another psu in the meantime, giving me nearly perferct 5v. AC is near 10v, but that should work.

Need to troubleshoot my circuit, as its giving me not the needed 14v and is getting really hot  ::)