03-01-2010, 05:40 PM
I have a schematic for a universal A-B-C supply around here somewhere. Let me see if I can find it.
It uses zener diodes to provide several B and C voltages from the same 120 volt source, plus a separate, regulated A supply.
I built it back when I used to collect 1920s battery radios. I no longer have the supply, nor do I have any of the 1920s battery sets from that period of my collecting hobby. I do have one three dialer that I acquired a year or so ago, an AK 20 Big Box with an AK model L horn. The radio needs complete restoration, and the horn has no driver.
It uses zener diodes to provide several B and C voltages from the same 120 volt source, plus a separate, regulated A supply.
I built it back when I used to collect 1920s battery radios. I no longer have the supply, nor do I have any of the 1920s battery sets from that period of my collecting hobby. I do have one three dialer that I acquired a year or so ago, an AK 20 Big Box with an AK model L horn. The radio needs complete restoration, and the horn has no driver.
--
Ron Ramirez
Ferdinand IN
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
