Search found 5 matches

by squonk
Sat Oct 11, 2003 7:48 pm
Forum: General Discussion
Topic: Signal sensing circuit
Replies: 5
Views: 1611

Re: Signal sensing circuit

Thanks, Dale, for your advice<p>Sorry! It’s conveyant.<p>I appreciate all the trouble you went to to help me! I found where the relay contacts punch down Thursday night. This is in a very busy hospital, which makes it very inconvenient to work on because it can never be shut down except for short pe...
by squonk
Thu Oct 09, 2003 3:55 pm
Forum: General Discussion
Topic: Signal sensing circuit
Replies: 5
Views: 1611

Re: Signal sensing circuit

Some more info. This is a Convayent PBX. There is a relay connected somehow to a 50 pair punch down. I can hear the relay click but I can't find the contacts on the punch down. I don't have any experience with the circuit components you describe above. I will be working on the system tonight. Any mo...
by squonk
Wed Oct 08, 2003 8:59 pm
Forum: General Discussion
Topic: Signal sensing circuit
Replies: 5
Views: 1611

Signal sensing circuit

Still trying to get the overhead paging system right. This time I need a circuit that will sense the incoming signal from the PBX console and pull in a relay that will apply the input to the paging amplifier. The signal comes in at line level, which is 1v peak to peak, I think. I want it to sense th...
by squonk
Fri Sep 05, 2003 4:08 pm
Forum: General Discussion
Topic: need help matching inputs to PA amp
Replies: 4
Views: 1190

Re: need help matching inputs to PA amp

Thanks, Guys for the great advice.<p>I have one of those small radio shack battery (9V)powered self amplified speakers which i can plug into that seems to work for the intermediate stage although it's noisy. Is there a better way to do this? It's interesting that if I use the earpiece and input it t...
by squonk
Thu Sep 04, 2003 3:58 pm
Forum: General Discussion
Topic: need help matching inputs to PA amp
Replies: 4
Views: 1190

need help matching inputs to PA amp

I want to use the output from a Plantronics telephone headset unit and feed it into a Radio Shack 100 watt PA amplifier. What do I have to do to match the impedance to either "microphone" or "CD/aux?" Assuming I can get that done, how can I get rid of any 60Hz hum that results? Can anyone help me? T...