After Thanksgiving Dinner this year I took the opportunity to make progress on the power supply for my 1939 transmitter.
I completed the 500 VDC and 7.5 VAC sections needed for the amplifier.
PSU Designer II indicated that I needed to allow for almost 2000 volts across each of the diodes in the bridge rectifier. I ended up using two 1000 PIV diodes in series for each leg of the bridge. This is a boat anchor power supply with silicon hidden under the chassis. It needed some glow. I added a type 80 rectifier connected only to 5 VAC so that it would look right. After all, real radios need to glow in the dark.
Eventually I'll add components to power the
oscillator/buffer stage including 250 VDC, 150 VDC and 2.5 VAC. In the meantime I can drive the amplifier with either my Utah Jr or Meissner Signal Shifter.
After Thanksgiving Dinner this year I took the opportunity to make progress on the power supply for my 1939 transmitter.
I completed the 500 VDC and 7.5 VAC sections needed for the amplifier. PSU Designer II indicated that I needed to allow for almost 2000 volts across each of the diodes in the bridge rectifier. I ended up using two 1000 PIV diodes in series for each leg of the bridge. This is a boat anchor power supply with silicon hidden under the chassis. It needed some glow. I added a type 80 rectifier connected only to 5 VAC so that it would look right. After all, real radios need to glow in the dark.
