MiniAmp Replacement. Mono Audio Amp. Gain = 20

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FYI, I think there are about 3 versions of the RS MiniAmp. The current version is 277-008C. I think there is also a version A and B. Attached is another version that claims to be official. The circuit P001-V2, is one that I drew out after I disected an mini-amp, and traced out the circuit and identified the parts. All versions that I have come across including the one I disected have different components.

I'm in the process of building the version that you sent me. I am short a couple of caps so I'll see if I can make it work after I get those.
 

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  • RadioShack-Offical-Speaker-Design.jpg
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  • P001_V2.png
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Your capacitor C2 in series with the geophone coil is only 100pF which is MUCH too small for any audio and lower frequencies to be produced by the geophone coil.
A capacitor in series with the geophone is not needed anyway.
 

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