Transmission indicator

Posted on Nov 30, 2012

Everytime the push-to-talk button is closed the light will go on. The antenna samples the output RF from the transmitter. That signal is then rectified (detected) by germanium diode Dl, and used to charge capacitor C2. The dc output is used to trigger a small silicon-controlled rectifier (SCR1), which permits the current to flow through the small pilot lamp.

Transmission indicator
Click here to download the full size of the above Circuit.

For lower-power applications, such as CB radio, the antenna will have to be close-coupled to the antenna.

Leave Comment

characters left:

New Circuits



Popular Circuits

LED Flashing circuits
Digital Encoder with PIC16F57
Crystal Oscillator
Dual-Band Loop Antenna For 80-160 M Circuit
Precision Audio Generator For Musical Instrument Tune-Up Circuit
Servicing the Hammond B-3 Type Pre-Amp
RF-Radio Frequency 6
TV Transmitter circuit diagram (VHF)
555 timer voltage controlled oscillator
hacking rfid for fun
Car Amplifier Circuit Schematic using TDA2040 Integrated Audio Amplifier
Automatic lighting control telephone signals