Search found 5 matches
- Sat Oct 11, 2003 7:48 pm
- Forum: General Discussion
- Topic: Signal sensing circuit
- Replies: 5
- Views: 3601
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...
- Thu Oct 09, 2003 3:55 pm
- Forum: General Discussion
- Topic: Signal sensing circuit
- Replies: 5
- Views: 3601
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...
- Wed Oct 08, 2003 8:59 pm
- Forum: General Discussion
- Topic: Signal sensing circuit
- Replies: 5
- Views: 3601
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...
- Fri Sep 05, 2003 4:08 pm
- Forum: General Discussion
- Topic: need help matching inputs to PA amp
- Replies: 4
- Views: 2647
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...
- Thu Sep 04, 2003 3:58 pm
- Forum: General Discussion
- Topic: need help matching inputs to PA amp
- Replies: 4
- Views: 2647
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? C...