I am doing something massively wrong and cant figuure heads to tails.
Ive got an api 325 line amp which is working fine.
Ive got a cinemag cmmi-7c which appears to be working fine. I can put a 1K, .1v signal between the brown/orange winding and get about .7v out from the yellow/green winding. That seems about right.
When I hook the transformer up the the card, however, I get a really loud hum, and no signal. This is with the case and screen floating. Connecting the screen to pin 1 on the mic input doesnt do anything. Connecting it to power ground makes the hum go away. I still can get no signal into the amplifier through the transformer. Ive got the secondary connected directly to pins 4/5 on a stock 325 amp. with a 600 ohm line level feeding the amp transformerless, it works fine.
This one seems fairly free of variables, I cant see what I could be doing wrong here. Any ideas?
thanks
dave
Ive got an api 325 line amp which is working fine.
Ive got a cinemag cmmi-7c which appears to be working fine. I can put a 1K, .1v signal between the brown/orange winding and get about .7v out from the yellow/green winding. That seems about right.
When I hook the transformer up the the card, however, I get a really loud hum, and no signal. This is with the case and screen floating. Connecting the screen to pin 1 on the mic input doesnt do anything. Connecting it to power ground makes the hum go away. I still can get no signal into the amplifier through the transformer. Ive got the secondary connected directly to pins 4/5 on a stock 325 amp. with a 600 ohm line level feeding the amp transformerless, it works fine.
This one seems fairly free of variables, I cant see what I could be doing wrong here. Any ideas?
thanks
dave