2002-11-03
Phone Tap
Not much to say about this project. It is a phone audio pick-up circuit I made many moons ago. Recently the subject came up on a news group and I took a look at the device, drawing up the circuit and posting it.
It is designed with safety for the connected recording device in mind. While it has no suppression gas-gap, it should handle minor transients and the full ring voltage in all countries. The isolation transformer is really not optional! It is what gives it most of its safety features. It probably won't stop a good lightening transient, stick a gas-gap across it if you like.
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| title | type | size |
|---|---|---|
| circuit postscript source | image/jpeg | 21.930 kbytes |