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-   -   PSA: snubberized PSU schematic with part numbers (

Mark Whitney 24th October 2017 04:26 PM

1 Attachment(s)
Here is the PSU PCB. Both the diodes and power led circuit are correct here.

Hogwild 25th October 2017 06:35 PM


Thanks for that.

Yes, I know. I'm just trying to make it easier for newbies. It's never a great thing when a schematic doesn't match a PCB.

turion64 23rd June 2019 02:32 PM

I think both the schematic and the PCB are correct. If you measure the DC at the outputs you’ll find the +/- orientation is exactly the same even though the outputs are marked (from left-to-right) as V+/PG+ then PG-/V- If you reverse the polarity of your probes you’ll measure the direct opposite polarity from the V/PG outputs on their respective sides.

phase 5th July 2019 05:58 PM

Will likely work better if the snubber components are connected closer (directly) to the rectifier diodes (source of hf shot noise) and not at the opposite end of the board, inches away from them and the added inductance of the filter capacitors as well.

Pretty nice to have a board with everything on it though, much cleaner looking than some of my setups!

805amp 5th July 2019 07:28 PM

Tom Christiansen (Neurochrome Audio) has just posted a very interesting article - Rectification and Snubbers, well worth a read.

Power Supply Design: Rectification & Snubbers.

phase 6th July 2019 08:53 PM

That write up is odd to say the least, couldn’t figure it out really.
Starts out describing what happens, then claims it doesn’t matter...

I trust my ears and suggest that others do the same, could save yourself a lot of money and hassle possibly too it appears.

tomchr 6th July 2019 10:13 PM

Not only do I claim that the addition of snubbers will not make any difference to the output of an audio amplifier, I validate that claim with measurements.

Adding a snubber might make a difference on whether your amplifier can pass the regulatory requirements for EMI, but that's another story.


nigelwright7557 13th August 2019 05:49 PM

C7 is shorted out.

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