This article will help you to build yourself a radio frequency probe. It is an useful plugin to any Digital Multimeter. Most devices of this kind are simple full wave diode rectifiers. Their biggest drawbacks are the high input capacitance and low input impedance. These make it impossible to give right readings at high frequencies. In some cases, these probes change the parameters of the measured circuit so much, that it stops working.Another major issue is that these devices do not operate with input voltages below 0.4VThe radio frequency probe described in this article, consists of a high frequency buffer with very low input capacitance and a transistor detector instead of diode one. These allow the specifications described.
- Low Input capacitance less than 5pF. - Frequency range from 0.2 to 500 MHz. - Supply 9V 6F22 battery. - Input Voltage range from 0.02 to 2.3 V - Time to build: Appr. 2 hours. - Cost of elements: Appr. USD 3.
- 4 high speed NPN transistors. - 13 resistors. - 6 capacitors. - a multiturn potentiometer. - a casing from an old 6F22 battery.
In the zip file (2.6MB) you will find:
- Circuit diagram with EAGLE PCB design. - LTspice simulation of the circuit. - Read me.pdf file with explanations and practical tips. - Pictures of the the device.
Complete the form below with your name, e-mail, Subject: Buy RF Probe, Massage: I have read and agree Terms section and I commit to buy the article 'RF Probe' from easy-diy-ideas.eu. Payment instructions will be e-mailed to you.