Another item I was given by my Grandfather...a former Illinois Bell employee.
I would like to wire this up as an extension doorbell buzzer (this one IS the proper one to do so)
And i wondered which 2 of the 3 wiring terminals should be used. I had written it down somewhere, but that location has evaded my mind...
Thanks!
if your power supply is AC wire without the interupter most likely terminals c and a .If DC wire through the interupter terminals C and D most likely.
Quote from: rdelius on February 08, 2018, 09:53:50 PM
if your power supply is AC wire without the interupter most likely terminals c and a .If DC wire through the interupter terminals C and D most likely.
Well, it appears our system utilizes AC power.
What would be the interupter you are mentioning? I do want to make sure this gets properly wired...
7D buzzer voltage range:
4-15 volts AC, 50-60 cycles....connect to terminals A and C
OR
4-15 volts DC....connect to terminals D and C
Ref: Bell System Practice Section 501-120-100, Issue 8, March 1973
most doorbell transformers are AC output. ignore the part about the interuptor, that's not part of a doorbell system. just connect the wires to the A and C terminals and you should be good to go....
Just saw the picture in the original post: this is a 7D bell, not a 7D buzzer, so the voltage range is a little different:
7D Bell:
6-18 Volts AC or 3-10 VDC
http://bellsystempractices.org/500-/501-/501-120-100-i08_1973-03-01.pdf