Recently finished recapping my Data East sound board and power board in hopes to combat the hum/buzz many DE games have. This did not work, however, wiring in an aux power supply to power the sound board solved the issue.

Now, I still have a slight buzz from the transformer, but it is no longer filtering through the speakers. However, I still have a buzz during attract mode when the lights are dancing around (which i do not think there is a solution for yet), and I am also getting some noticeable "white noise" coming from the right speaker.

It is not a "hum" or a "buzz" but more like a white noise as if your not directly tuned into a radio station. I am not sure if this has always been there, and am just now noticing now that the main buzz noise is gone, or if this is a new issue.

Could this be a bad capacitor solder? I'm definitely not the best at it so its very possible...any other ideas what could cause this white noise?

Thanks,
Jim

I'll have to get a buddy to help with that...a bit out of my capabilities. But good place to start! Thanks! It's not super annoying, but its noticeable when game is in attract mode.
Jim

Yeah, I have checked all the main culprits. Everything is tight and secure...will double check the ground on the PS though...I have an alpha numeric display so I can't use that test to judge it. I did just hook in an aux PS to power the sound board, and maybe the white noise is coming form the new PS? I do have another PS laying around I can use to test....

I am a little new at this (but have done alot of research) and my setup is as follows with pictures to explain.

The incoming AC wires into the aux power supply, which then feeds into the transformer. The outgoing DC power of the aux PS (+12, -12, +5) feeds the sound board. The COM connection on the aux PS feeds the GND pin on the sound board.

I will say that the aux PS does have a FG connection that I am not using (I was told using the COM would be ok). The black wire in this case is the ground wire and also included a pic of the outputs of the aux PS.

Do I need to move the ground wire to the actual FG ground on the PS? I also included a pic of the PS data sheet...thank you so much for the help!

Jim

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This is exactly why i come to this forum as I am not entirely sure. I was just following another PINSIDE thread regarding this setup...

To answer your questions, I do have a ground braid running through my entire machine, and as far as i know, everything is connected to it correctly. As for the aux PS, Im not powering it from the transformer, im powering it from the AC line right after the switch...then powering the transformer.

As for the PS ground...I was just following what someone else has suggested. Are you saying I should consider connecting the Power Supply Floating ground to the ground braid?

Correct, I am just hearing the "white noise" mainly in the RIGHT speaker. It exists in the left, but very very faint. I would say I heard 90% of it in the right, 10% in the left.

I apologize, it does seem like the white noise is coming from all 3 speakers (though louder on the right).

I will look Further into grounding the aux power supply.