Telemonitor For Recording Phone Calls

Posted on Sep 7, 2012

This circuit switches a tape recorder via PL2. When on-hook, D5 conducts, turns on Ql, and cuts off Q

Telemonitor For Recording Phone Calls
Click here to download the full size of the above Circuit.

2. Ringing voltage will also cause D5 to conduct; C2 and CI should be rated 150 V or higher. When phone is off-hook, the 10 V or so present on the line will not break down D5, and therefore Ql is off and Q2 is biased on. PL2 connects to the remote control jack on the tape recorder. Audio is taken from PL1. Caution: Use either a battery tape recorder or an FCC/CSA/UL-approved ac adapter-powered tape recorder. This precaution is to avoid inadvertent 120 Vac on the telephone line.

Leave Comment

characters left:

New Circuits



Popular Circuits

One-Zener Precise Limiter
Three-Decade 15Hz To 15Khz Wien-Bridge Oscillator
Telemonitor For Recording Phone Calls
Emergency Telephone Dialer Circuit
infrared Help Troubleshooting This Circuit
Circuit Power audio Amplifier with TDA2030 2.1 Chanell 3 x 18 Watts Subwoofer Complete With PCB suggestion and power supply
A-3-7-type air compressor control circuit
Thirty light water CNC circuit diagram CD4067 CD40193 NE555