Hi sir, i tried your link intercom and got a perfect result for 9 phone handsets unless i connect the buzzer to the switch hook inside the phone handset. When the phone is off-hook then the collector of its associated transistor is getting a voltage due to the voltage at the pin of handset's switch hook in off-hook condition. Due to this there is an additional clock pulse to the counter for the output pins after that particular handset, for example if #4 is off-hook and we dial #6 then the ring goes to #7 instead of #6. Could u please help me out for connecting the buzzer properly to the switch hook so that i can get rid of that voltage. Please reply me as early as possible, its very urgent. Thank you..
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