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Hoffman Amps Forum image Author Topic: doing math ?  (Read 1777 times)

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Offline shooter

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doing math ?
« on: November 26, 2016, 07:42:53 pm »
Using 2 balance R's on series caps, + acts as bleeder.  2 150k in series, tied to caps, B+ ~ 500vdc.

I'm using V-squared / 300,000, coming up with .83W, doubling, (for good measure) ~2W?

thanks, ya slap me again, just don't want unwanted smoke:)
Went Class C for efficiency

Offline sluckey

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Re: doing math ?
« Reply #1 on: November 26, 2016, 07:57:24 pm »
.83 watts is the total power for both resistors. Each individual resistor only dissipates .42 watts, so you really only need to use 1 watt resistors for safety.

Fender was fond of 220K/1W balance/bleeder resistors.
A schematic, layout, and hi-rez pics are very useful for troubleshooting your amp. Don't wait to be asked. JUST DO IT!

Offline PRR

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Re: doing math ?
« Reply #2 on: November 26, 2016, 09:03:07 pm »
> don't want unwanted smoke:)

Smoke is learning.

Offline shooter

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Re: doing math ?
« Reply #3 on: November 27, 2016, 06:12:59 am »
thanks guys, I don't mind a smoke now n then, but this aint mine so....no smoke please :laugh:
Went Class C for efficiency

Offline drgonzonm

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Re: doing math ?
« Reply #4 on: November 27, 2016, 01:56:22 pm »
Use two watts just to be safe.   I can see a case where one ties the R in series with the caps, and there is a node where two Rs and two Cs are wired together.  Resistance then be comes a function of frequency, and one must use complex numbers to do the math.   :sad2:

 


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