@▷ Sensitive RF Voltmeter Probe | Diagram for Schematic

Sensitive RF Voltmeter Probe

Sensitive RF Voltmeter Probe

Sensitive RF Voltmeter Probe Circuit

This Circuit measures RF voltages beyond 200MHz and up to about 5V.

Sensitive RF Voltmeter Probe Circuit diagram

PARTS LIST R1 4.7MΩ R2 1MΩ R3 1MΩ R4 100kΩ R5 330Ω R6 10kΩ R7 10kΩ VR1 2kΩ VR2 2kΩ C1 0.001µF (Disc Ceramic) C2 0.001µF(Disc Ceramic) C3 0.01µF D1 1N914 Q1 2N3819, 2N5459, MPF102 M1 100µA S1 Switch BT1 9V Battery

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

MPF102 n-channel  JFET VHF Amplifier pin configuration

MPF102 N-Channel JFET VHF Amplifier Pin Configuration

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