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RING Detect

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dramrattan

New Member
Hi,

I am trying to detect a ring and send it to a PIC18F452. I used the first circuit on the link below and getting approximately 3.85V at the output everytime the phone rings. I was getting 5V at the output when i have C2 = 10uF but the time constant formed by C2 & R1 to reduce the voltage back to zero volts was too long (1s) and causing conflict with the PIC18F452.

I changed the capacitor to a 1uF so the voltage would reduce back to zero volts in 0.1 seconds but the voltage at the "ring detect" now drops to 3.85V everytime the phone rings.

How do i keep the time constant at .1 seconds but have the ring detect voltage at 5V?. :confused:
 

Torben

Well-Known Member
You forgot to include the link.


Torben
 
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