Hi guys, I'm still here...
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I bought a hammond 154e..20mH.. to put in my psu.
My psu pcb is not the standard one on sale..I make it on a breadboard.
I would like to do it this way.
I ask if you see something strange..something missing ... in short, if there are corrections to be made ... I would appreciate it ..and Sorry for my poor English!
In my valve pcb board i have 6 x 150uf 400v.
In this schematic i suppose is ok ...total of 333uF before the L and 183uF..after the "L".
I am looking for the "quieter solution" and I am able to change the capacities of the entire circuit according to your advice!
More or less I quantized the values of C (around "L") by reading on this forum and also looking at your psu photos.
I was also taught that the capacity before and after L no must never be identical as strange oscillation phenomena can be created!
Considering these capacities before and after "L" ... and the capacities on the valve board (6 x 150uf) .. is everything ok?
In my drawer I have 3 options for diodes. The ones you recommended MUR4100..or I have MUR460 and up I also have HFA08TB60PBF.
I would be grateful if you had a look at the respective datasheets to help me understand which ones to use. They are all already in my drawer.
Diodes Option:
MUR4100 (75ns) >
http://www.liteonsemi.com/download.php?hSFile=MUR4100-0.pdf&hDFile=tecfile01493279020.pdf MUR460 (60ns) >
https://www.onsemi.cn/PowerSolutions/document/MUR420-D.PDFHFA08TB60PBF (UltraFast and UltraSoft /// 55ns or less) >
https://www.infineon.com/dgdl/hfa08tb60pbf.pdf?fileId=5546d462533600a4015355bfd7ed15d5This is my pattern (voltage values are under load):
![](https://i.ibb.co/TLctD02/SCHEMA-FORUM-NEW-PSU-WITH-HAMMOND.jpg)
So I was wondering:
- If the capacity before and after the "L" are fine or if I have to increase / decrease them.
- Would it be better to put on capacitors..of low capacity bypasses? If yes, how much? One per capacitor or one per group of capacitors?
- If on the capacitors I have to put R's in parallel .. to discharge them and to make the transformer see more a "resistive" rather than capacitive load.
I read something about it but I didn't understand much (I would prefer for the capacitors to discharge quickly on shutdown).
- Which diodes are the most suitable for my situation and my availability? I already have the three options.
-....and finally ... the snubber talk about diodes. Should I put them yes or no? I suppose YES...but....but I would like confirmations .. especially based on the diodes that are used. Does it depend on the diodes?
I did some reading and there are also options to put only one snubber at the exit of the bridge..and therefore not a snubber for each diode.
Someone says that if you put subber on fast diodes ... it doesn't make sense because the snubber slows them down !! I have no idea ...
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I would only like the quieter solution!
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I really hope that you will clarify these doubts because I would like to get down to work immediately to make this pcb ... definitive again.
Thank you so much.
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