PHONE TRANSMITTER

 

PHONE TAPE - 1

This simple circuit will allow you to tape-record a conversation from a phone line. It must be placed between the plug on the wall and the phone. The easiest way is to cut an extension lead. Wind 300-500 turns of 0.095mm wire on a plastic straw and place the reed switch inside. Start with 300 turns and see if the reed switch activates, Keep adding turns until the switch is reliable.  Fit two 100n capacitors to the ends of the winding for the audio. Plug the Audio into "Mic"

on tape recorder. Plug the remote into "remote" on the tape recorder and push "record." The tape recorder will turn on when the phone is lifted and record the conversation.

PHONE TAPE - 2

The circuit is turned off when the phone line is 45v as the voltage divider made up of the 470k, 1M and 100k puts 3.5v on the base of the first BC557 transistor. If you are not able to cut the lead to the phone, the circuit above will record a conversation from an extension lead. The remote plug must be wired around the correct way for the motor to operate.