Small phone deconcentrator circuit

Published:2011/10/23 22:22:00 Author:May | Keyword: Small phone, deconcentrator | From:SeekIC

Working principleIfthe line connects totwo phones, which are separately connectedto L and L'. ( We know that when the phone is wating, the different of switch on office line L will have 60V or 48V DC voltage. When it is ringing, there is 95V or 75V AC voltage. When the phone is off-hook, the line voltage will drop to about 10V because the intervene of pnone internal resistance, this device is designed according to this principle. ) If there is phone now, AC current will ring through above-mentioned circuit diagram. If you want to turn to standy phone, the off-hook can dial number keylike standby phone ( attention: thephone must be in impulse dial state). Components choose BG1, B2are MCR100-6 small single-track SCRs, andthey require breakdown reverse voltage to begreater than 100V. D1, D2are 18V voltage regulator diodes. The whole cricuit can load in phone junction box.



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