Obi110 plus SPA8000 as Poormans Analog PBX
Shale:
Confirming Stooba info: K1 is the spot for a relay. R38 and R39 are jumpers that close the path for the N.O. contacts. These would be removed if a relay were to be installed.
RF150 and RF151 are fuses that connect the Line to the swingers on the contacts.
I see gary-gary (who may have gotten the info from another post) identifies the relay in http://www.obitalk.com/forum/index.php?topic=6413.msg40769#msg40769 as K1 - TX2-4.5V (Panasonic)
That relay's pins are on a 0.1 inch grid and that relay is available from distributors.
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