Dig Dug amp problem

MRCMRC

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[SOLVED] Dig Dug amp problem

Hello.

I'm making an adaptor to connect my Dig Dug PCB on a Jamma cab. I'm building a small amp for the sound, just this one:

http://pfnicholls.com/electronics/lm380.html

I'm not using C2 between LM380 pin 1 and GND. I use a pot of 10K, and the negative input is connected to GND.

When I move the pot, nothing happens (no sound), until I get a position of the pot, where there is sound. Moving a little the pot from this position makes the sound disappear.

Do you know what am I doing wrong?

Thanks for the help.
 
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