I have an input to a system that requires a 10mVpp max signal. I have to use my computer to input it due to constraints out of my control. I am well aware an audio card cannot go down that low. I have several attunators, one active and one passive (just a potentiometer and some resistors).
no matter what I do I cannot get the signal to go that low. I have also tried introducing a digital amplifier (just some high quality digital speakers with an audio out) into the system between the computer and the attenuators but had no success.
Where can I go next? what other information can I provide to help.
I am running audacity on a dell optiplex 760 (my computer) and it has the manufacturers audio card in it. I did some quick research and it seems most built in audio cards have about 46Ohm impedence. I couldn't find info on my exact card. It maxes out its output at about 3Vpp and starts to struggle keeping its output stable below 150mVpp.
I am also using a probe master 20:1/200:1 active attenuator (model 4231) and a homemade potentiometer attenuator.. about as simple as it sounds.
ANY help is appriciated.. this is stumping several of us and we are unsure of where to go next.
thanks in advance!