Bleeder Resister

[m.wanat]

I built a DC power supply and would like to install a bleeder resister across the cap. What specs should it have?

Power supply specs:
21 VDC output
47,000 uf, 75 v cap.
35 amp, 600 v bridge rectifier

[NC Cams]

Bridgeport used a 3.3K ohm, 1/2 watt resistor for many of their machines.

At a full 21volts, this resistor would initially sink 6.6 milliamps and, at that rate, should not get appreciabley warm. Naturally, as the voltage on the cap dropped, so would the current as would the power being dissipated.

[m.wanat]

Thanks for the info. I will order one up and wire it in. I would hate to get zapped by that cap.