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Posts tagged connecting two telephones in parallel

Intercom switch circuit

Intercom switch circuit Intercom switch circuit Two line intercom plus a telephone changeover switch Click here for the circuit diagram. The circuit presented here can be used for connecting, The circuit presented here can be used for connecting two telephones in parallel

Switches Diagram for traffic signs

Switches Diagram for traffic signs

tube amp diagram

tube amp diagram using EL84, ECC82

Electronic circuit diagram Low distortion audio amplifier Using KA22135

Electronic circuit diagram Low distortion audio amplifier Using KA22135

Circuit HAMCOMM MODEM

The program only needs a simple “infinite gain” circuit to square off the input tones so that they can be read by the serial port. This is achieved using a 741 operational amplifier. The basic circuit of the unit is given below. The RS232 pins are given for a 9-pin serial port. A 25-pin port […]

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