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large power amplifier

foTONICS

Sep 30, 2011
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I don't really have a question about this, I just figured people may be interested in this large transformer I found inside a power amplifier I have here at work
20150917_160049.jpg 20150916_164651.jpg

Actually I do have a question. The high wattage resistors across each of the caps, that's to slowly dissipate any left over energy inside the caps once I turn this off right?
 

davenn

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Sep 5, 2009
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I don't really have a question about this, I just figured people may be interested in this large transformer I found inside a power amplifier I have here at work

yup, typical of AF and RF power amplifiers over the last 10 - 15 yrs


Actually I do have a question. The high wattage resistors across each of the caps, that's to slowly dissipate any left over energy inside the caps once I turn this off right?


yes that is correct
 

Ratch

Mar 10, 2013
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I don't really have a question about this, I just figured people may be interested in this large transformer I found inside a power amplifier I have here at work
View attachment 22015 View attachment 22016

Actually I do have a question. The high wattage resistors across each of the caps, that's to slowly dissipate any left over energy inside the caps once I turn this off right?

Yes, those are called "bleeder resistors". If I knew the capacitance value of each of those caps, I could calculate the RC time constant of that circuit.

Ratch
 

foTONICS

Sep 30, 2011
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If I knew the capacitance value of each of those caps, I could calculate the RC time constant of that circuit.
Ratch

I believe it was 33000uF
 
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Ratch

Mar 10, 2013
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I believe it was 33000uF
OK, 33000uf *4 caps * 2000 ohms/4 = 66 sec, or a time constant of about 1 minute. So in 1 minute the voltage will drop to e^-1 or 37% of its max value and in 2 minutes it will drop to e^-2 or 13.5% of its max value.

Ratch
 
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