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In Reply to: RE: Good pick-up Jeff. posted by banpuku on February 24, 2017 at 07:45:22
You got it, basically. Read on "Time constant" to get an idea of what values of R and C are ideal for your circuit. And the other point Jeff made is that you may need a higher B+ ahead of the RC decoupling network, so to account for the necessary voltage drop across the new R. That's if you want to keep B+ to the output stage the same as it is now.
Follow Ups:
Lew,
Thanks for the TC comment. I just read on Time Constant. Here is what I came up with:
Fc = 1 / (2*pi*R*C)
I want to target an Fc of roughly 2-4hz.
My C is already determined by my existing caps which are 50uF. So, if I pick an R value of 1000 ohms, this gives me an Fc = 3.18 hz. This will drop the B+ going to the driver, but I think that will be OK because I will reduce the existing 22K Plate Resistor that drops the Plate Voltage to 133V. I can work on that offline.
let me know if this sounds correct.
Thanks,
Pat
No !! You let us know !! :-)Plug the entire filter into PSUD, and tell us what you need to get 1 mVAC at C3. That would be L1/C1.L2/C2/R1/C3. C3 equals 50-51 uF. Do not worry too much about a low time constant, but concentrate on 1 mVAC of ripple at C3, as your design priority.
Low Mu
Edits: 02/24/17
Jeff - I would like to use PSUD, but I have a MAC computer and PSUD is for PCs only. I got the Time Constant to work with an Fc = 3.1 hz by using a 1k R1. Pat
Don't tell soul I told you this, but it can be three times or more higher, and NOT be a problem. But I want 1 mVAC at C3. Call me some times, and I will ask you for data to input, and I can PSUD supply for you.Is the new Pontiac GTO running well ?? Still liking the purchase??
JM
Edits: 02/24/17
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