Sensitive RF Voltmeter Probe Circuit
This Circuit measures RF voltages beyond 200MHz and up to about 5V.
|C1||0.001µF (Disc Ceramic)|
|Q1||2N3819, 2N5459, MPF102|
The Diode should be mounted in a remote probe, close to the probe tip. Sensitivity is excellent and voltage less than 1V peak can be easily measured. The unit can be calibrated by connecting the input to a known level of RF voltage, such as a calibrated signal generator, and setting the calibrate control.
VR1 =For Calibrate
VR2 = For Zero set
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