05-29-2014, 01:36 PM
Forum members,
I have a Philco model 38 Farm radio in restoration. I need to build a power supply for it to replace the batteries. I remember seeing some time ago a schematic that showed the circuit. I believe the circuit had connected several zeners to arrive at the various voltages needed. It was simple and clever. I started looking for the diodes, but lost the paper and with it the design. Has anybody in this forum built this before? I thought perhaps Ron Ramirez might remember. I think that it tapped +135vdc, +67.5vdc, +2vdc, -3vdc, and -7vdc. These are the listed source voltages for the 38, per the schematic. Otherwise, I'll need to breadboard something up and experiment.
St Tee
I have a Philco model 38 Farm radio in restoration. I need to build a power supply for it to replace the batteries. I remember seeing some time ago a schematic that showed the circuit. I believe the circuit had connected several zeners to arrive at the various voltages needed. It was simple and clever. I started looking for the diodes, but lost the paper and with it the design. Has anybody in this forum built this before? I thought perhaps Ron Ramirez might remember. I think that it tapped +135vdc, +67.5vdc, +2vdc, -3vdc, and -7vdc. These are the listed source voltages for the 38, per the schematic. Otherwise, I'll need to breadboard something up and experiment.
St Tee
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
