Quoted from Daniel5:

Hi everyone
I'm posting on an old thread because I've solved an old problem. I'm the guy who makes the PSU5 and this is a blatant plug for my product. I changed the color.
Actually, after a long delay I finally found a solution to the noise generated by the PSU5 when some games are switched off. It is due to the PSU5 switching on and off rapidly when the voltage on the electrolytic capacitors recovers a little after the load disappears. The new revision of the module fixes this issue on all the machines where its been tested. Some of the details can be found on the shop page for the module https://www.ezsbc.com/product/psu5-nonoise/.
I have sold many and its removed reset problems from many machines but introduced the unwanted noise on some. A good way to remove the reset problems on about every Williams machine is by using Rob's WPC Power Fix board. It's super simple to install and fixes all the resets.
Daniel
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