I have an immediate need (for a stage play) to take the audio from the microphone of a telephone handset and feed it to a Shure M67 audio mixer, familiar to anyone who's been in radio for a while (mixer PDF). Note that the schematic of the unit is on the last page.
I took a gamble and just soldered two wires to the two pins on the microphone and fed it directly to one of the inputs on the mixer to see if it might be "good enough". It moves the needle, and I can hear myself in headphones, but the audio controls are turned all the way up and there's a lot of noise, of course. Note that there's also a "line input".
I'm hoping the only problem is an impedance mismatch and someone can figure out a resistive matching circuit for me since it's been too long since I've done that and I need it by Thursday (and I'm panicing). Can someone help me out, please?
EDIT: Note that the schematic of the unit is on the last page.
Here's a picture of the phone with a line connected to the microphone and running to the XLR connector: https://i.stack.imgur.com/nxhPL.jpg
And here's the back of the mixer that it connects to: https://i.stack.imgur.com/DblhA.jpg
EDIT2: I just realized I hooked up to the earpiece and not the microphone but I wouldn't think that would matter but maybe I'm wrong.