I retrieved a Motorola Telephone-Style handset wich was in service with a Motorola radio GM380. It is the same as https://shop.motorolasolutions.com/rln4756-telephone-style-handset/product/RLN4756A but with two additionnal keys (F1 and F2).
I would like to get the mic output of the handset to a 3.5mm jack for a computer. I already managed to make the speaker work, but I can't get the mic to work.
The connection is an RJ50, and I didn't find the pinout for the GM380. So I did some reverse engineering and the pinout seems similar to this one (from the GM300), if you take pin 1 as pin 2, pin 2 as pin 3, ... : Here is the circuit in my handset (both wires red and black at the bottom go to the mic) :
WHITE - pin 1 "PB1" BROWN - NC BLUE - pin 3 "HOOK" BLACK - pin 4 GND RED - pin 5 MIC AUDIO GREEN - pin 6 PTT PURPLE - NC YELLOW - pin 8 HANDSET AUDIO
I only did some basic electronics and never any audio thing before, so I don't get how can I make the mic work. Can someone help me please?