Telephone Line Tester Circuit


Posted on Mar 24, 2013

The telephone-line tester consists of nothing more than a meter (that`s used to measure line voltage in the on- and off-hook state), three resistors (one of which is variable), a pushbutton switch, and a modular telephone connector.


Telephone Line Tester Circuit
Click here to download the full size of the above Circuit.

When the circuit is connected to the telephone line, a meter reading of 5 to 10 V (when SI is pressed) indicates that the line is okay.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

hi-fi audio amplifiers with tl072
Surround Sound Decoder circuit diagram
radio mf tx
Audio Level Meter
Fast Voltage-Driven Current Source
Dodd Station
ultrasonic switch circuit
DIY ECG Machine On The Cheap
THREE FREQUENCY AUDIO OSCILLATOR
Simple timer circuit MC14541



Top