Apollo voltage-regulator modules

[Stedy]

@x56h34:

There does not appear to be much in the Apollo 040 rom, take a look (Tek Hex format)

From what I can see, it is just used for Auto config stuff.

@Patrik,
It should be possible to make your own regulator board up. You could use a 3.3V LDO regulator.

I have the details of the wire links for power, somewhere...

[Stedy]

This is the circuit used



The Voltage regulation is set by the TL431 adjustable voltage reference. The whole system is not that efficient (upto 65%) but does the job.

On the Apollo 040, you have to remove 2 jumper links and solder an appropriate connector into the group of 4 and 3 solder pads near the AMD MACH device. Probing the card with the power on, will reveal which is 5V and which is 0V.

Have fun  :-P