8 Intercom line using 89 c 51
This project is intended to make the intercom system of low cost 8 lines that can interact with this hardware.Main Board:On this card there are 89 c 51 microcontroller is used. Micro controller is the MT8870 controller and analog DTMF encoder switch MT8816.SLIC Plate:On this card, there is a constant current source is used to activate the phone. The LM339 is used to detect out-of-hand and the
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