• You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.

Bleeder resistors

238

Active Member
May 20, 2019
146
9
28
77
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
 

dxChat
Help Users
  • No one is chatting at the moment.
  • @ Wildcat27:
    Hello I have a old school 2950 receives great on all modes and transmits great on AM but no transmit on SSB. Does anyone have any idea?
  • @ ButtFuzz:
    Good evening from Sunny Salem! What’s shaking?
  • dxBot:
    63Sprint has left the room.
  • dxBot:
    kennyjames 0151 has left the room.