Multi-function telephone control switch circuit

Published:2011/6/12 22:28:00 Author:Christina | Keyword: Multi-function, telephone, control, switch | From:SeekIC

The function of this machine is as follow: (1)Remote control, local control: the operator can call the telephone which is in parallel with this control through the external, when the number of phone rings is equal to the value of the controller setting, the controller will automatically simulate the off-hook and send out the long beep of Di to remind the operator to input the password. (2)Off-electrical memory protection (3)Query function: you can query the opening and closing state of the switch (4)Automatically hangs up Components selection: the audions VQ4 and VQ5 can use the 9014. The VD5 and VD6 can use the 5mm red light-emitting diode. The resistance of R20 is 100Ω, the resistance of R19 is 47Ω, the resistance of R18 is 100Ω. The other components is as shown in the figure.



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