exxos's Atari, Amiga & retro forum

the -12V rail is down to -10.59 v and the 12V is 11.59, +-5V is good, fan spins up but the 12V is too low, any ideas? This is a Skynet supply with Chemicons so I haven't replaced any caps on it, maybe I need to? Would be good to have a schematic but that doesn't appear to be available anywhere, so any suggestions would be good, thanks!

This is normal and good.

Yes as Frank said this is within tolerance and fine

The + 12v from the powersupply has only a few milliamps and is not loadable ...

12v 200mA. Falcon pulls 130mA from it.

https://www.exxosforum.co.uk/atari/last/ ... htm#FALCON

OK, but is that acceptable for the -12 rail, a -10.69 sounds awfully out of tolerance, thanks!

jacolover wrote: 17 Mar 2021 22:17 OK, but is that acceptable for the -12 rail, a -10.69 sounds awfully out of tolerance, thanks!

There is probably no regulation on the 12V, only the 5V. 12V is just pot luck on winding ratios of the transformer itself. So "normal" could be 10V-14V etc.

Thanks exxos, I plan on using this supply with a Mega STe as they have the same connector and looks like the same voltage requirement, does that sound OK?

jacolover wrote: 17 Mar 2021 22:50 Thanks exxos, I plan on using this supply with a Mega STe as they have the same connector and looks like the same voltage requirement, does that sound OK?

Falcon PSU's are nothing like MEGA STE PSU's... They are not compatible.

Thanks for the heads up, just looking at them I thought they were, good to know!