speaker hum..or back ground noise on the 48 in 1

pacman71

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okay what causes ... back ground noise in the speaker. It isn't terrible but it is present. It isn't effected by turning up or down the volume.

the speaker is 8 ohms and the I believe that is what is called for by the 48 in 1 board.

Is there easy way to reduce this noise? other than unplugging it.
 
I think there was a thread on this before.. I can't remember the final answer..

speaker is grounded? have the positive / negative to the correct leads?
 
Make sure that it is not just your board. Grab a pair of powered speaker (computer speakers would be fine) and plug it in to the 1/8 inch jack and see if you still get your buzz.

That is what I had to do, as if I went off of black and white off of the board, I would get a buzz to it, that was driving me nuts(not loud, but bothersome). Now I use an amp off of an old set of CPU speakers and have it powering the cab speaker and I just use the jack on my 60 in 1. Much less buzz and (it could be me or my board) but the in-game sounds better using the jack instead of the black and white jamma wire.


;
 
Try splicing shielded wires into it (microphone wire from RS if necessary). I had a game that was like that. because the way it was wired the speaker wired run up along the side of the monitor and along behind the fluorescent tube in the marquee. If I turned both of them off, the buzz went away (hard to play the game though). So I used some shielded wire from a set of speaker cables and the noise went way, way down.

Try turning the monitor off and the marquee light off one at a time and then together and see if that helps. If it does, shielded wire. If it doesn't, then try the separate amp trick.

ken
 

my PAC MAN had this and when i gently wiggled the connector, the buzz went away.

i ended up clamping the wires to the cabinet near the connector which solved the problem by holding the connector in a different position on the game PCB.
my next step was going to be to replace the pins inside the connector to see if that solved the problem but i havent done that yet.
 
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