exxos's Atari, Amiga & retro forum

arkadiusz.makarenko wrote: 23 Feb 2022 07:16 Electron will work with DC PSU.

I have a variable 15-22vDC PSU, so will use that. Have you used a particular voltage successfully?

I'm just guessing that about 16VDC is around the average of a rectified signal.

mrbombermillzy wrote: 23 Feb 2022 07:32

arkadiusz.makarenko wrote: 23 Feb 2022 07:16 Electron will work with DC PSU.

I have a variable 15-22vDC PSU, so will use that. Have you used a particular voltage successfully?

Im just guessing that about 16VDC is around the average of a rectified signal.

This is the PSU specs lifted direct from the service manual:


Hopefully will help.

mrbombermillzy wrote: 23 Feb 2022 07:32

arkadiusz.makarenko wrote: 23 Feb 2022 07:16 Electron will work with DC PSU.

I have a variable 15-22vDC PSU, so will use that. Have you used a particular voltage successfully?

I'm just guessing that about 16VDC is around the average of a rectified signal.

I bought one elk which arrived with 16V DC psu, and it just worked.

rubber_jonnie wrote: 23 Feb 2022 10:01 Hopefully will help.

Thanks ;)

I think Ideally, knowing the actual voltage, board side, straight after the power supply would really nail it.
If that isn't known and if we really want a precise measurement, then it'll be a case of finding out the size of the smoothing capacitor on the rectifier circuit and try to figure out therefore how fast the voltage drops in between the sine peaks and calculate a mean voltage. :)

Lets just say I sold my 'scope many moons ago, so that wont be happening! (Thats if I even had a 19VAC PSU to test!)

I'm guesstimating a 16VDC average, peak to drop mainboard side, but this may be wrong and I don't know what would need this on the board. (I would expect the usual 12v for motors/5v for the board components DC power lines, so wonder if there's something that actually uses AC in there, like e.g. the C=64 SID chip, that maybe gets stepped down and split off before the rectifier stage??).

Hope I'm making sense here. My electronics theory is very rusty. :lol:

arkadiusz.makarenko wrote: 23 Feb 2022 12:40

mrbombermillzy wrote: 23 Feb 2022 07:32

I have a variable 15-22vDC PSU, so will use that. Have you used a particular voltage successfully?

I'm just guessing that about 16VDC is around the average of a rectified signal.

I bought one elk which arrived with 16V DC psu, and it just worked.

Well, that's probably the easiest/simplest answer. Thanks. That's what I will do then. :D

Both my original PSUs are 19vAC

Anyway, enough of derailing @rubber_jonnie's thread. When I'm ready, I will create my own 'Uh, Oh, electron/me too' thread! :lol:

mrbombermillzy wrote: 23 Feb 2022 13:02 Anyway, enough of derailing @rubber_jonnie's thread. When I'm ready, I will create my own 'Uh, Oh, electron/me too' thread! :lol:

Hehehehe

:threadjacked:

Well, got one of these on the way, ElkSD64:


Expands the RAM to 64K and gives SD card storage, looks pretty neat :)

Nice case. :-)