Pls find the attachment. Our aim is to turn on relay when telephone detects ringing signal. 555 configured as monostable. T1 turns on by optocoupler. This applies a negative going trigger at pin2 of 555.
Is there any issue of shorting both Vcc's when T1 on. Kindly reply......
Is there any issue of shorting both Vcc's when T1 on. Kindly reply......
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