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Telephone speech recorder circuit

A telephone recording with a tape recorder simple circuit shown in Figure X and Y in the phone lines, resistors R1 and R2 form a voltage divider, R2 the voltage into the tape recorder's "MIC-IN" jack, R1 accordance with the value of R2 recorder "MIC-IN''side to adjust the input impedance of the capacitor C1 from the blocking effect. hang up, the bridge rectifier with 48V DC voltage output, D5 breakdown, the transistor Tl turns on, T2 cutoff, relay RL is not action, no voltage on the power outlet recorder, tape recorder does not work. hook, the bridge rectifier output DC voltage of about 10V, D5 deadline, T1 end, T2 conduction, RL pull, tape recorders have electricity and telephone recording began. hang up, the recording automatically stops. peacetime should be placed within the tape recorder, and press the record button, so that once the hook, a voice recording begins. capacitor C2 ensures that the number dialed does not jitter when the relay contacts.

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Telephone speech recorder circuit