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Old 31st March 2005, 01:37 PM   #1
Sherman is offline Sherman  United States
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Question Built-in bleeder in ASC?

I connected my DVM to the second cap in my PSU and powered up and after five or so minutes powered down. The voltage quickly dropped to zero without a bleeder resistor installed. I then did the same check on the first cap with the same result.

Questions-
1- Is there a bleeder resistor built into ASC caps?
2- If "No" to question 1 then is the rest of the circuit acting as a bleeder and discharging the caps?
3- If "No" to 1 and 2 could the 8H choke between the caps be acting as a bleeder to discharge them?
4- If "No" to 1, 2 and 3 what the heck is discharging the caps? Do ASC caps just discharge quickly when power is removed?

Enquiring minds want to know. I was apparently doing nothing when I thought I was discharging the caps using my 220K "Resistor-on-a-stick" custom made cap discharger .
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Old 31st March 2005, 03:34 PM   #2
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Sherman, I just did the same thing and my ASC caps discharged as if all by themselves. Never saw this before. Half wave rect, choke filtered, through a 15K resistor.
By the way, I tickled mine up to 1000v without failure, and less than 1ma of current.
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Old 31st March 2005, 08:56 PM   #3
Sherman is offline Sherman  United States
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Quote:
Originally posted by dshortt9
Sherman, I just did the same thing and my ASC caps discharged as if all by themselves. Never saw this before. Half wave rect, choke filtered, through a 15K resistor.
By the way, I tickled mine up to 1000v without failure, and less than 1ma of current.

1000V? Wow, I don't know that I would have tried that. My caps are rated at 370VAC so I figured they'd be fine at a ~400VDC.

My PSU is tube full wave rectification (5U4-G), 40uF ASC cap, 8H choke, 100uF ASC cap.
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