That will be a very interesting device when it i completed. Years ago I studied the plans published for "the femtofarad Meter" as part of a work project. But we needed to measure dielectric absorbtion and its variation and changes with aging and temperature. So measuring capacitance was not enough, nor was measuring leakage current.I am building a capacitor tester.
front end of charge-coupled preamps.
Those are for current sense, so they are mΩ(m=0.001), not MΩ(M=1000000).Set of 5, 200MΩ x 5 all in series... Not cheap!
Arcol Ohmite 13-SERIES CURRENT SENSE AXIAL RESISTORS 5Pcs 3W- 100mΩ Or 200mΩ | eBay
You find them in condensor microphones, such as the AKG C451. The capsule load resistor is 10G for the in-built JFET preamp.
OK, those would be the non-electret capacitor microphones, the electret mics are so very small that a big resistor would not fit.You find them in condensor microphones, such as the AKG C451. The capsule load resistor is 10G for the in-built JFET preamp.
(not a C451, but similar)
They are not difficult to get
Yes - proper studio microphones, not telephone handset inserts.OK, those would be the non-electret capacitor microphones, the electret mics are so very small that a big resistor would not fit.
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by Jake Hertz
by Jake Hertz
by Jeff Child