A little over a year ago, I posted a request for help (1) in designing a circuit to get 300VDC out of a power supply that was pumping out ~520VDC. I got many helpful replies, but unfortunately, I was unable to complete the circuit. I now have three transmitters (2,3,4) that would like a nice source of high voltage and I must now admit that I really do need your help in completing this project.
I own a really nice, heavy transformer that I'd like to use- unfortunately, the voltage is a bit too high- it puts out ~520VDC (after a 3-pole filter 10uF/10H/10uF with 40kOhm bleeder resistor). I am looking for some ways to bring this down to the voltage I need.
Although I consider myself a competent builder, I am unfortunately not much of a designer - this is what has prevented my progress for the past year! I own the '05 ARRL handbook and Art of Electronics, but I'm just not comfortable doing this myself. Specifically, telling me the type of transistor/tube and not specifying the part number or an article describing a similar HV regulator would leave me somewhat stranded. I know I'm asking a lot here -- please understand that I am immensely greatful for any of your help!
Here is my specification / wish-list, in decreasing order of importance:
- produce ~370Vdc at 120 mA
- cost less than
- not require modification of the transformer
- also be able to produce ~240Vdc at 40 mA
- also be able to produce ~300Vdc at 70 mA
- be hollow-state
- be elegant
References (1) One link to this thread is at