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Old 18th April 2009, 04:03 AM   #1
john65b is offline john65b  United States
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Default Choke Input Filter on Class A PS

Hello all,

I have a PS question - I have used a Choke input design to better reduce ripple and reduce the B+ of a tube amp before and it worked perfectly.

I am looking at another Choke input application where I can use a Dual secondary tranny (40 - 0 40 - 0) with a choke input to get around +/-35 VDC rails (VDC =.9 x VAC) for a class A Zen amp.

I found an SAE EMI filter that measures 12mh (with my LC meter), .1 ohm series resistance input to output. Also rated for 6A each side. Looks to be a perfect drop in solution to put after the FWB rectifier and a Cap multiplier. The diagram is shown below. The diagram shows the small caps across the rails, and two 7 mh coils on both sides with a 270k ohm resistor in center.

Anyway, any reason to think this wont work as a choke input filter?? I see these al l the time on flea bay and wonder if instead of finding a 2.5mh inductor, just use one of these jobbies...

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Old 20th April 2009, 09:09 AM   #2
AndrewT is offline AndrewT  Scotland
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calculate the maximum and minimum currents that the 7mH can supply.
regards Andrew T.
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Old 20th April 2009, 09:48 AM   #3
MRupp is offline MRupp  Germany
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Anyway, any reason to think this wont work as a choke input filter??
Yes, this piece has common mode chokes and won't work, except as a noise filter as designed. Unless off course you have only a few mA to run through it and wire as differential mode.
Martin Rupp
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