ring detection circuit

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summersnow

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ring detector circuit

I have a problem here.
i tried to build a ring detection circuit.
But when i connect the ring and tip of the telephone cable to this circuit,i found out that it automatically being off hook.
As a result,it cant be used to detect the ringing signal and it get engaged when i call to the telephone.
Is there anyone who can explain to me why it get off hook even there are no ringing signal?
Thanks in advance
 

Hi,

Please try this circuit. It works well for most European countries.

Var1 : varistor. For protection purpose.
L5, L6 : for EMC purpose. Avoid unwant signal radiates out through telephone line.
K3010 : Bidirection photocoupler. For line reversal only. You can keep on use your current photocoupler.

Roger
 

telephone ring detection circuit

I have a similar ring detector as yours.
It works perfectly.

Maybe you would like to take a look for reference,
**broken link removed**
 

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    summersnow

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