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

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

Please send your ideas, which are very important for our success…

Tags: , ,
10 comments on “Sensitive RF Voltmeter Probe
  1. Great information! I’ve been looking for something like this for a while now. Thanks!

  2. CNA Salary says:

    Great, I never knew this, thanks.

  3. found your site on today and really liked it.. i bookmarked it and will be back to check it out some more later

  4. cna training says:

    Wow this is a great resource.. I’m enjoying it.. good article

  5. This is such a great resource that you are providing and you give it away for free. I enjoy seeing websites that understand the value of providing a prime resource for free. I truly loved reading your post. Thanks!

  6. I’ve recently started a blog, the information you provide on this site has helped me tremendously. Thank you for all of your time & work.

  7. WP Themes says:

    Genial dispatch and this fill someone in on helped me alot in my college assignement. Thanks you as your information.

  8. Giochi says:

    I just wanted to comment and say that I really enjoyed reading your blog post here. It was very informative and I also digg the way you write! Keep it up and I’ll be back to read more in the future

  9. Kamran Shuja says:

    a good idia

Leave a Reply

Your email address will not be published. Required fields are marked *


This site uses Akismet to reduce spam. Learn how your comment data is processed.

Electronic Circuits


Enter your email address: