Simple Telephone Recorder
This nifty little circuit lets you record your phone conversations automatically. The device connects to the phone line, your tape recorder’s microphone input, and the recorder’s remote control jack. It senses the voltage in the phone line and begins recording when the line drops to 5 volts or less. R1 1 270K 1/4 W Resistor R2 1.5K 1/4 W Resistor R3 68K 1/4 W Resistor R4 33K 1/4 W Resistor C1 0.22uF 150 Volt Capacitor Q1, Q2 2N4954 NPN Transistor D1 1N645 Diode MISC Wire, Plugs To Match Jacks On Recorder, Board, Phone Plug.
Read more original source:http://www.aaroncake.net/circuits/phonrec.asp
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Categories: Telephone Tags: Recorder Audio, telephone circuit, Telephone Recorder
Telephone Recorder Switch by FET
This circuit will allow you to record both sides of your telephone conversations for future reference. For commercial orders placed over the phone such a recording device is invaluable.
Read more original source:http://electronics-diy.com/electronic_schematic.php?id=575
Categories: Audio diagram, Telephone Tags: Recorder Audio, telephone circuit, Telephone Recorder
Parallel Phone Tap Circuit Diagram
In a recent article, I discussed the difference between parallel and series telephone taps. In this article, I present a very simple and reliable parallel phone tap circuit useful for recording telephone conversations onto a tape recorder.
When installing a telephone tap, its advisable not to cut the telephone line in anyway. Cutting the telephone line for any time is detectable, and therefore series devices can be detected in this way. Parallel devices can be installed without cutting any telephone wires, and is thus harder to detect.
The diagram shows a simple circuit using just 6 very cheap and common components. To build the circuit, you will need some Veroboard or prototype board (whatever you favourite is), some wire, and a 3.5mm plug that will connect to your tape recorder’s microphone input socket. I have left it to the reader to work this bit out, as its very simple to do but quite awkward to explain!
Source:http://www.spyreview.co.uk/2006/10/08/parallel-phone-tap-circuit-diagram/
Categories: Audio diagram, Pre Amplifier, Telephone Tags: telephone control, Telephone Recorder
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