neazoi
Advanced Member level 6
Hello, how can I pulse dial a phone line using a micro?
I think a transistor must be connected with it's base to the micro, its emitter (npn) to the gnd and it's collector to one of the two telephone lines. Each time a pulse is sent by the micro, the NPN pulses the line to form the digit.
Do I need to connect a resistor somewhere between the transistor and the line to avoid hard short circuit?
I think a transistor must be connected with it's base to the micro, its emitter (npn) to the gnd and it's collector to one of the two telephone lines. Each time a pulse is sent by the micro, the NPN pulses the line to form the digit.
Do I need to connect a resistor somewhere between the transistor and the line to avoid hard short circuit?