PSA: Chipamp.com snubberized PSU schematic with part numbers - Page 2

Mark Whitney · 24th October 2017, 04:26 PM

Here is the PSU PCB. Both the diodes and power led circuit are correct here.

Hogwild · 25th October 2017, 06:35 PM

Mark:

Thanks for that.

levistubby:
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. https://www.electronics-tutorials.ws/diode/diode_6.html

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 · 07:33 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.

Tom

nigelwright7557 · 13th August 2019, 05:49 PM

C7 is shorted out.

DaveFred · 11:10 PM

Quote:

Originally Posted by tomchr

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.

Tom

Hello Tom,

Where is this post?

[edit, nevermind, I found it Taming the LM3886 Chip Amplifier: Rectification and Snubbers – Neurochrome ]

Thank you,

David.

5th July 2019, 07:28 PM	#15
805amp diyAudio Member Join Date: Dec 2006 Location: Little Sutton Ellesmere Port	Tom Christiansen (Neurochrome Audio) has just posted a very interesting article - Rectification and Snubbers, well worth a read. Power Supply Design: Rectification & Snubbers. Last edited by 805amp; 5th July 2019 at 07:33 PM.

6th July 2019, 10:13 PM	#17
tomchr diyAudio Member Join Date: Feb 2009 Location: Calgary	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. Tom __________________ Modulus-86, 186, 286, & 686: 40-240W (8Ω), <-120dB THD. HP-2 Headphone Amp: 660mW, <-130dB THD. Taming the LM3886. Neurochrome : : Audio - www.neurochrome.com - Engineering : : Done : : Right

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Bd1000 part numbers	Rzabo2004	Car Audio	13	4th December 2012 06:18 AM
Carlos' snubberized Gainclone Power supply, Part II	peranders	Chip Amps	77	17th September 2009 10:14 PM
FS: Chipamp.com snubberized PSU boards	Nisbeth	Swap Meet	1	15th March 2007 01:59 AM
SMD part numbers?	nuppe	Parts	0	15th December 2004 11:04 PM

New To Site?	Need Help?
Register to Participate Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read

25th October 2017, 06:35 PM	#12
Hogwild diyAudio Member Join Date: Oct 2010	Mark: Thanks for that. levistubby: 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.

23rd June 2019, 02:32 PM	#13
turion64 diyAudio Member Join Date: Mar 2019 Location: Trenton, NJ	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. https://www.electronics-tutorials.ws/diode/diode_6.html

5th July 2019, 05:58 PM	#14
phase diyAudio Member Join Date: Oct 2004	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!

6th July 2019, 08:53 PM	#16
phase diyAudio Member Join Date: Oct 2004	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.

13th August 2019, 05:49 PM	#18
nigelwright7557 diyAudio Member Join Date: Apr 2008 Location: Carlisle, England	C7 is shorted out.