RF detector circuit diagram using transistors

Posted on Feb 4, 2014

This circuit responds to RF signals bellow the standard broadcast band to over 500MHz and provides an visual, and audible indication when the rf signal is detected. By adjusting the bias of D2 with the R2 potentiometer the circuit can detect low power or strong signals. A very sensitive setting can be obtained by modifying R2 until the LED begins

RF detector circuit diagram using transistors
Click here to download the full size of the above Circuit.

to light. Keep diode and capacitor (C1) leads short to minimize stray inductance. The used transistors can be: 2N3906, 2N2907 or other PNP high gain transistor for Q2 and PN2222A, 2N3904 or other NPN high gain transistor for Q1.

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    Automatic Fader Circuit
    pH Sensors LMP91200 Schematic Diagram
    Charge the battery capacity tester and realize the scheme
    Simplest and low cost USB AVR
    phase shift oscillator circuit
    25 watt audio amplifier circuit
    Digital thermometer circuit based on CA3162 CA3162 and LM35
    Light Related
    Nathans Z80 Project Mark 2
    Motion Detector
    Simple square wave generator
    Lighting controller circuit
    Blackout emergency lights 4
    Efficient inverter control circuit