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Problem on telephon hold circuit.....

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smorteza

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Hi.
What should I do to hold four telephone_line with one hold_circut that none of them can hear speaking of other lines.
Thanks.
 
To hold the line "off hook" you just have to put a current load on it. Use an opto isolator with transistor output and resistor load on each line. Do you have a power supply for the LEDs?
 
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