Bleeder resistor action

sam9 · 15th May 2003, 01:40 AM

Anyone have an opinion about how long bleeder resistors should take to drain the caps in a power supply? In terms of them being a saftey feature, I've assumed 1-2 minutes is about right since it would take at least that long to open the enclosure. I don't want it be so short that I'm wasting current, either.

I don't think it needs the be fool-proof since I expect to be the only fool opening the amp

sam9 · 15th May 2003, 01:41 AM

Yeesh!

faustian bargin · 15th May 2003, 01:50 AM

darn. i thought it was some advancement in biotechnology. self-replicating components, or something.

Circlotron · 15th May 2003, 03:00 AM

I thought it migh be a resistor of oriential origin.

karma · 15th May 2003, 03:30 AM

lol for me when i work on em.i use a old 120watt safety light and
discharge it i dont trust any bleeder resister. i likelly will be told it's not the right way to do it but it works

warning high voltages dont find out the hard way like i did trusting a resister !!hoohaaahollymonky

peranders · 15th May 2003, 12:41 PM

This is a typical trade off.

Short time = Heat.

I should think a time between 5-30 seconds is normal. You could also have an active solution with a transistor or relay + resistor.

sam9 · 15th May 2003, 03:47 PM

Thanks Peranders, more the response I was looking for.

Although it's my own fault I got the other responses, being a clumbsy typist.

audiofan · 15th May 2003, 04:08 PM

Be carefull if you are using inductive filter ( choke ) there is a minimum current needed to maintain magnetic flux in core to make shure inductor is making filtering action

jackinnj · 15th May 2003, 08:48 PM

bleeders are discussed in the ARRL handbook -- and the discharge time should be short, like 90% within a second or so. the formula for discharge is

E(sub t)/E(initial) = e^(-t/RC)

15th May 2003, 01:40 AM	#1
sam9 diyAudio Member Join Date: Jun 2002 Location: Left Coast	Breeder resistor action Anyone have an opinion about how long bleeder resistors should take to drain the caps in a power supply? In terms of them being a saftey feature, I've assumed 1-2 minutes is about right since it would take at least that long to open the enclosure. I don't want it be so short that I'm wasting current, either. I don't think it needs the be fool-proof since I expect to be the only fool opening the amp

15th May 2003, 01:41 AM	#2
sam9 diyAudio Member Join Date: Jun 2002 Location: Left Coast	I mean bleeder not breeder!! Yeesh!

15th May 2003, 03:00 AM	#4
Circlotron diyAudio Member Join Date: Jun 2002 Location: Melbourne, Australia	I thought it migh be a resistor of oriential origin. __________________ Best-ever T/S parameter spreadsheet. http://www.diyaudio.com/forums/multi...tml#post353269

15th May 2003, 12:41 PM	#6
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	This is a typical trade off. Short time = Heat. I should think a time between 5-30 seconds is normal. You could also have an active solution with a transistor or relay + resistor. __________________ /Per-Anders (my first name) or P-A as my friends call me

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15th May 2003, 01:50 AM	#3
faustian bargin diyAudio Member Join Date: Jan 2003 Location: piedmont	darn. i thought it was some advancement in biotechnology. self-replicating components, or something.

15th May 2003, 03:30 AM	#5
karma diyAudio Member Join Date: Feb 2003 Location: hamilton,ontario	lol for me when i work on em.i use a old 120watt safety light and discharge it i dont trust any bleeder resister. i likelly will be told it's not the right way to do it but it works warning high voltages dont find out the hard way like i did trusting a resister !!hoohaaahollymonky

15th May 2003, 03:47 PM	#7
sam9 diyAudio Member Join Date: Jun 2002 Location: Left Coast	Thanks Peranders, more the response I was looking for. Although it's my own fault I got the other responses, being a clumbsy typist.

15th May 2003, 04:08 PM	#8
audiofan diyAudio Member Join Date: May 2003 Location: quebec	Be carefull if you are using inductive filter ( choke ) there is a minimum current needed to maintain magnetic flux in core to make shure inductor is making filtering action

15th May 2003, 08:48 PM	#9
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	bleeders are discussed in the ARRL handbook -- and the discharge time should be short, like 90% within a second or so. the formula for discharge is E(sub t)/E(initial) = e^(-t/RC)

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