Received a 107b telephone speaker from a fellow member the other day and need some pointers on how exactly these hook into a desk set (500C/D or 500L/M specifically).
I know they bridge part of the transmit circuit going to handset and need a wall-wort power supply (also read 9v battery mounted internally works too) but I cannot find any specifics on the wiring color code and placement on the network.
Thanks
Use this BSP:
http://www.telephonecollectors.info/index.php/browse/bsps/by-division-number/wiring/doc_details/2639-463-221-100-i8-1980-107b-loudspeaker-tl (http://www.telephonecollectors.info/index.php/browse/bsps/by-division-number/wiring/doc_details/2639-463-221-100-i8-1980-107b-loudspeaker-tl)
Red to term GN on network, Green to R on network, bk and y to 10-18 vac 2012b transformer.
You can use 12 vdc on the black and yellow. If you use a 9v battery ill will run down fast.
This will let you hear what the handset receiver hears.
Thank you very much to you both, just the info I needed!
finally got to finishing the "spokesman" addition. I opted for using two 9v batteries in series to power the speaker as I dont have the outlet space for another wall-wort. A tight fit inside to be sure, but works great.
Lastly, and I hope i dont catch too much flak for this; i ended up painting the shell black to match a 501 serving as the host (rather than the moss green 500 it was intended for) as the plastic was a very discolored bright green and this was easier than sanding etc.