Home » Audio » Group Build » Can someone spot me a bleeder resistor for the PS cap
Can someone spot me a bleeder resistor for the PS cap [message #30594] Sat, 19 February 2005 10:36 Go to next message
colinhester is currently offline  colinhester
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Please. I have everything except for this.....Colin

Re: Can someone spot me a bleeder resistor for the PS cap [message #30597 is a reply to message #30594] Sat, 19 February 2005 10:53 Go to previous messageGo to next message
PakProtector is currently offline  PakProtector
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This depends on the use. If we wanted a bleeder to insure at least critical current was drawn, we might want a differnet value than if we just wanted a resistor to bleed the PS capacitors down.

Back to the question: bleeder R. We need this R only to provide a discharge path. V-squared over R to determine power requirements. Let's say 200V. Anything over 40kOhm will need less than a watt. Two 1/2 watt 100k in parallel, is reasonable( and available from Radio Shack @ $1 for 5).
regards,
Douglas

Two RS resistors it is [message #30598 is a reply to message #30597] Sat, 19 February 2005 11:48 Go to previous messageGo to next message
colinhester is currently offline  colinhester
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Excellent

Re: Two RS resistors it is [message #30603 is a reply to message #30598] Sat, 19 February 2005 13:15 Go to previous message
Damir is currently offline  Damir
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Registered: May 2009
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I`d use 47k/3W metal-oxide resistor (or, say 2x100k/2W in parallel). Non-flammable, with 200V it`ll dissipate P=U^2/R=0,85W. But, in extreme case - unloaded PS (5687 "dead" or removed) B+ can go up close to the theoretical 1,4142*Urms = 350V (little less, actually), and then we`ll need 3W resistor...

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