Probably cannot get a schematic for you. I would have to disassemble the wiring so I can use a magnifier to see it. It's SMT and some of the components can't see any markings on them. Can't even get a good photo of it because the board is turned over face down and wires/ribbon are in the way, and i don't want to risk damaging it.
That mod I did is probably okay. I don't know enough about the bipolar power supply and probably had my DDS signal generator set wrong offset. Those cheap DDS do not adjust well or at all. So I plan to do some more checking and studying. Just an example i learned that 15K resistor damps the square wave and cuts off the corners. You see I am very ignorant to all this.
Thanks for your offer to help. If i ever get the thing apart I will let you know.
BTW, you can view Carl's schematic go to the geotech1.com click on LRL then click Reports, then click Mini Eliminator II.
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