POT4a

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revisions from POT4

removed unused input resistors and capacitors
On POT4 a 1meg resistor was stacked on CC3 - this resistor added to SCH and PCB
removed 4th order filter, changed 3way jumper to 2way
2nd order filter is now NON-Inverting
unused opamp OPTIONALLY used to drive input cable shield ????

changed 0805 output cable CAP to 1206. Panasonic X5R series @ 25V 1uf to 10uF!

add option for variable gain

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