centipede jamma adapter

mudhens1

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i'm getting a working board and a jamma adapter with sound, is that all i need? i see there's another connector at the other end of the board and i'm not sure what it's for...thanks in advance for the info
 
That other edge connector on the board is sound and video output. The JAMMA adapter I built has another connector attached for that 2nd edge connector....
 
the adapter i have is from y plus...it combines two of the edge connectors...there is a third one on the board, what's that one for?
i can faintly hear game sounds but there is a loud hum, there wasn't one on the golfing jamma board that was in there previously
 
ahhh...i see...thanks for the info...
any help on the loud hum and lack of audio?

A normal Centipede generates its sounds on the CPU board, and amplifies them on the AR2 board. Since the Jamma setup doesn't use the AR2, it needs its own sound amp. If you have faint sounds, the CPU is probably doing its job, so look for loose connections or problems with the on-board adapter amp.
 
it's a brand new adapter...how hot should the ic (circled in red) get that's right below the volume pot? it doesn't blister my finger, but it's hotter than warm...
 

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it's a brand new adapter...how hot should the ic (circled in red) get that's right below the volume pot? it doesn't blister my finger, but it's hotter than warm...


I have that adapter and the sound pot is trashed and missing the knob, anybody know what value pot I should replace that with??
 
Make sure your edge connectors are clean and making good contact.
 
it's a brand new adapter...how hot should the ic (circled in red) get that's right below the volume pot? it doesn't blister my finger, but it's hotter than warm...

That the audio amp.... he designed the circuit poorly so it oscillates at high frequencies (too high to make it through the speaker), so it gets hot.

I don't know what's so hard about reading datasheets.
 
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