双色球模拟选号器

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双色球模拟选号器tube power supply pcb with bias supply

for my 815 amp, as well as other projects, i designed a pcb that provides hv rectifiers and filter caps plus an isolated supply that can be used as a negative bias supply.

it's pretty self-explanatory.  the hv side uses a bridge made of to-220 rectifiers (i would suggest a sic schottky) with a center tap.  this provides two voltages, a high voltage, and a lower (roughly 1/2 the high voltage).  the filter caps are arranged in series.  this allows you to generate a high b+ (for example, 600v) and a lower voltage for drivers and screen supplies.

pads are provided for chokes in both the b+ and s+ (lower voltage) path.  if you don't need a choke you can install a jumper wire.

the bias supply is a separate bridge rectifier and crc filter.  there's pads on the pcb to allow you to connect the positive side (c+) to gnd, so you get a negative bias supply (c-).  you do not have to make this connection, so you could also use it to generate a separate, floating power supply voltage.

For help designing a power supply, I highly recommend Duncanamps PSUD simulation program双色球模拟选号器.  It will help you figure out optimal values for the caps, chokes, and resistors.

Here's the schematic (or download a PDF file):

here is the pcb, available on :

双色球模拟选号器the assembled pcb:

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