At 11:02 AM 12/2/1999 -0500, you wrote:
Hello -
I would be very interested in looking at the schematic.
john
The attached file is from the fifth edition of the NAB Engineering
Handbook, 1963.
I used the lower part as the basis for my ringer, and doubled up on the
2N256's to get more currant. ( I had to ring big old phones reliably. If it
doesn't ring when it is supposed to, the sound man is in trouble!)
Later I installed a power transformer and rectifier so it could be run off
AC.
Also, you might do a search on the net for Don Britton Enterprises, 7906
Santa Monica Blvd. Hollywood CA, who were suppliers of various telephone
circuits and stuff about thirty years ago.
Regards
Charlie Fox