Advertisement

Spy Telephone Circuit

This FM spy telephone circuit is mounted serrial with the phone line. When is signal on the wires this transmitter will radiate airwaves thru the wires wich act as anntenna. There is no need for batteries because it got his voltage supply from the phone lines.

There is no need for antenna too, the phone wires radiate all the radio energy. The transmision frequency can be set from the trimmers.

Spy telephone circuit diagram

telephone spy schematic

17 Comments

Join the conversation!

Error! Please fill all fields.
Looking for the latest from TI?