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Bleeder resistors

238

Active Member
May 20, 2019
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Putting bleeder resistors on old Maco's. Wondering what size would be best. Capacitors are 100uf x 450 volts. Jim/238
 

The three-filter Maco board we sell on fleabay uses 220k 2 Watt. Or 240k when Mouser runs out.

A smaller resistance value will speed up the bleed down. If you want to use 100k, it should be rated at 5 Watts.

It's a tradeoff between bleedoff speed and the power dumped by each resistor. A 330k or 470k runs cooler, takes longer.

Most important reason is to equalize the voltage across each cap in a series string. Just gotta use the same resistance for each bleeder.

73
 
I am not always sure what kind of resistor to use. Would it be best to use metal film or carbon film or carbon compose. I have 390k 3watt metal film and some carbon 470k 2 watt. Witch would be best? Jim/238
 

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