F4 Psu help needed please ! - diyAudio
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Old 4th February 2011, 11:08 PM   #1
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Default F4 Psu help needed please !

Hello every-one ! I had just purchased the F4 pcb's from our "DiyAudio-store" here. My question is this > how may I use the BrianGT style pcb's from chipamp.com, they were designed for a Aleph-30 or mini ? There set-up for pos + gnd + neg @ 6 x 22,000uf -CCRC per board. I would like to use 2 such boards for my F4 build with a 400Va 2 x 18 vac transformer which I allready have. Any help would be greatily appreciated Thank's

Last edited by thor61; 4th February 2011 at 11:10 PM.
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Old 4th February 2011, 11:35 PM   #2
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for what exactly you need help ?

you wrote already everything

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Old 5th February 2011, 01:03 AM   #3
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Hello ZEN-MOD : My idea is to use 1 pcb per channel with a single transformer. I was thinking 6 x 10,000uf for each pcb, If you know the pcb's that I'm talking about, my question is what resistor values need to be used for CCRC to obtain the best performance for the F4 Psu ? Also is having 60,000uf per-channel enough or would more be better ? If so how much ? I have a very modest income and can't afford to experiment to much nor do I want to burn things up ect... Really just looking for some guide line to build my F4 the best way possible with the mix of boards I have. I have not ordered the Psu capacitors or resistors yet and can't afford to double order becuase I had made a mistake ect... They say measure twice cut once for best result. This is what I'm hopping to do with the help from other's who know alot more than I ! Any help would be help-full ! Again Thank-you .............
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Old 5th February 2011, 03:43 AM   #4
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Quote:
Originally Posted by thor61 View Post
If you know the pcb's that I'm talking about, my question is what resistor values need to be used for CCRC to obtain the best performance for the F4 Psu ?
If you really want best performance, skip the resistor and install a 2mH aircore inductor.


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Also is having 60,000uf per-channel enough or would more be better ?
plenty.

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Again Thank-you .............
no worries. BUT, if you really want to learn, download PSUD II, input the parameters off of the component datasheets, and start simulating!
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Old 5th February 2011, 09:37 AM   #5
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in case of using R there - use 0R1 - enough for decreasing ripple and not too much of increasing supply impedance
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Old 5th February 2011, 11:16 AM   #6
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Quote:
no worries. BUT, if you really want to learn, download PSUD II, input the parameters off of the component datasheets, and start simulating!
This needs to be in the forum sign-up document...

'I understand that I need to download and learn to use PSUDII <tickbox>'
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Old 5th February 2011, 01:48 PM   #7
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Zen Mod : Thank-you ! The board has a provision to parallel 5 - 3w resistors I'm gonna try 5 @ 0.47 ohm this should be close to 0R1. Also having not ordered the caps yet is 10000uf OK ? I can not down-load PSU designer II as I currently use a friends computer. Here is a picture of the board's I plan to use for a total of 120000uf @ 60000 per channel please advise if this is OK > Click the image to open in full size.

Last edited by thor61; 5th February 2011 at 01:51 PM.
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Old 5th February 2011, 02:03 PM   #8
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just go for it

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Old 5th February 2011, 02:03 PM   #9
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Not trying to get off topic but I had found this soft start and wondered what everyone thinks either good or bad for the F4 > soft start electronics for audiophile hifi audio amplifiers : avondale audio
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Old 5th February 2011, 02:37 PM   #10
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just use CL60 ( one for 110V or 2 in series for 220V ) - as Papa use
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