The power lights on the receivers do not appear any brighter when plugged into the PS1, than when plugged into the adaptor. Playstation controllers with dualshock feature, vibrate through the aid of a 9v signal that is not used in the APPE adaptor design.
I thought that maybe, the receivers were picking up extra power from the 9v line. I went and brought a 7809 voltage regulator and stepped down the 12v signal from the ATX supply to a 9v and provided the receivers with that current to the formerly unused pin. No difference at all.
I don't understand how they could be that different?? Both the receiver and a regular wired pad, plug into the same socket on a PS1/2. Logically I would therefore think that both devices must provide the PS1/2 input with the same signals in order for them to function.
So on that basis, I'm inclined to think that the PS1 is providing the receivers with something that the APPE adaptor is not, or the APPE adaptor is throwing something at the receiver it can't handle. I have however removed and replaced, all the wires one at a time, from the adaptor to the receiver, to try and isolate the wire/signal causing the problem. It didn't change anything. So it must be something the PS1/2 provides the receiver with that the adaptor doesn't.
I'm running out of ideas and inspiration ATM :-?
Still hunting for info on the receivers.