I need help with designing a circuit to help me in cutting customers telephones lines from one central office to another. The basic idea is to be able to hear the ANI (automated number identification) from the test line on my talk line. My TALK LINE is a normal phone connection to a facilities tech.. I want to dial the ANI with my DIALER on the TEST LINE and be able to hear the number call-out from that line on my talk line.
I have a working circuit I am using now but the volume is very low coming from the test line. I am using .01 uf caps (200v) as C1 and C2 with a 600ohm 1:1 isolation transformer. Can someone suggest the correct cap values which would give the loudest audio from the test line to my talk pair or suggest a better simple circuit.
My circuit:
**broken link removed**
I may be way off track but my reasoning behind this circuit design is to use the isolation transformer to separate the power sources from two central offices and the two capacitors to block DC current to NOT take the phones off hook.
Line voltages are 45v dc on-hook, 5-10v dc off-hook and ringing volts spiking to aprox 90v vrms 20hz.
I am not worried about voltage or current protection anywhere in this circuit , except the caps and transformer, as the end equipment are telco test sets and are already protected..
Any help would be appreciated..
Thanks, MarkW
I have a working circuit I am using now but the volume is very low coming from the test line. I am using .01 uf caps (200v) as C1 and C2 with a 600ohm 1:1 isolation transformer. Can someone suggest the correct cap values which would give the loudest audio from the test line to my talk pair or suggest a better simple circuit.
My circuit:
**broken link removed**
I may be way off track but my reasoning behind this circuit design is to use the isolation transformer to separate the power sources from two central offices and the two capacitors to block DC current to NOT take the phones off hook.
Line voltages are 45v dc on-hook, 5-10v dc off-hook and ringing volts spiking to aprox 90v vrms 20hz.
I am not worried about voltage or current protection anywhere in this circuit , except the caps and transformer, as the end equipment are telco test sets and are already protected..
Any help would be appreciated..
Thanks, MarkW