Installing bleeding resistors

bereanbill · 25th May 2009, 08:34 PM

How do I put bleeding resistors to drain out stored voltage before working on an amp ? I always drain from the plates of the outputs anyway...and leave it hooked up to prevent the caps from regaining their memory..LOL. Having resistors would keep me from having to reposition the clip wire when working.
Also...where can I find info on a bench isolation tranny? Thanks again for all of your advice so far....you guys are great !!!

aardvarkash10 · 25th May 2009, 09:40 PM

I always put a 200k bleeder (or thereabouts...) from the power live side of the supply caps to earth. In a CRCRC chain, I put it on the FIRST cap - the others will bleed back through it, and it doesn't impact the voltage of the final output cap this way. Takes a minute to bleed out, but its ALWAYS there, so you never get a nasty "reminder" ! In my latest amp, I put an LED in the bleed circuit as well, giving a visual indicator that the thing is still very much LIVE!!!! When the LED is no longer glowing, its safe to go inside...

bereanbill · 25th May 2009, 09:54 PM

To Aardvarkash10...the resistor on the power side to ground doesn't affect the circut during operation ? Also, can you explain to me how you added the LED...sounds like a great innovation !

Michael Koster · 25th May 2009, 10:33 PM

I always permanently solder a bleeder resistor to each filter capacitor.
This prevents there from ever being a misunderstanding as to the
charge level and avoids the dangerous spark-out method.

330K/3W works well for up to about 800V. These ones have a 1000V
DC rating.

GS3-100-3303-JLF

http://www.mouser.com/Search/Product...vN%2fvezPVc%3d

The multiple bleeders provide redundancy in case one fails or is disconnected.

Michael

aardvarkash10 · 25th May 2009, 10:53 PM

scruffy diagram, but hopefully you get the gist...

bereanbill · 26th May 2009, 12:25 AM

To Michael Koster: Hey, been a while...thanks for the pic. My Mutated 5C3 is a great amp...especially for a first build. I call it "The Severed Head"
To AArdvarkash10: Yeah, I got it...you have the bleeder after the first cap but before the first dropping resistor. I only need that one or one at each cap. ( You drew the exact scenario that I am addressing, BTW . Maybe we're the Cosican Brothers..LOL).

25th May 2009, 08:34 PM	#1
bereanbill diyAudio Member Join Date: Jan 2009	Installing bleeding resistors How do I put bleeding resistors to drain out stored voltage before working on an amp ? I always drain from the plates of the outputs anyway...and leave it hooked up to prevent the caps from regaining their memory..LOL. Having resistors would keep me from having to reposition the clip wire when working. Also...where can I find info on a bench isolation tranny? Thanks again for all of your advice so far....you guys are great !!!

25th May 2009, 09:40 PM	#2
aardvarkash10 diyAudio Member Join Date: Mar 2007 Location: Auckland, NZ	easy fix I always put a 200k bleeder (or thereabouts...) from the power live side of the supply caps to earth. In a CRCRC chain, I put it on the FIRST cap - the others will bleed back through it, and it doesn't impact the voltage of the final output cap this way. Takes a minute to bleed out, but its ALWAYS there, so you never get a nasty "reminder" ! In my latest amp, I put an LED in the bleed circuit as well, giving a visual indicator that the thing is still very much LIVE!!!! When the LED is no longer glowing, its safe to go inside... __________________ "Folks, you can't prove truthiness with information. You prove truthiness with more truthiness. In a process known as truthinessiness." - Stephen Colbert, The Colbert Report

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25th May 2009, 09:54 PM	#3
bereanbill diyAudio Member Join Date: Jan 2009	To Aardvarkash10...the resistor on the power side to ground doesn't affect the circut during operation ? Also, can you explain to me how you added the LED...sounds like a great innovation !

26th May 2009, 12:25 AM	#6
bereanbill diyAudio Member Join Date: Jan 2009	To Michael Koster: Hey, been a while...thanks for the pic. My Mutated 5C3 is a great amp...especially for a first build. I call it "The Severed Head" To AArdvarkash10: Yeah, I got it...you have the bleeder after the first cap but before the first dropping resistor. I only need that one or one at each cap. ( You drew the exact scenario that I am addressing, BTW . Maybe we're the Cosican Brothers..LOL).