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Chipamp IC amp kits & PC boards from ChipAmp

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Old 24th October 2017, 03:26 PM   #11
Mark Whitney is offline Mark Whitney  Netherlands
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Here is the PSU PCB. Both the diodes and power led circuit are correct here.
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Regards Mark.
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Old 25th October 2017, 05:35 PM   #12
Hogwild is offline Hogwild  Canada
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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.
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Old 23rd June 2019, 01:32 PM   #13
turion64 is online now turion64  United States
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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
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Old 5th July 2019, 04:58 PM   #14
phase is online now phase  United States
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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!
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Old 5th July 2019, 06:28 PM   #15
805amp is offline 805amp  United Kingdom
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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 06:33 PM.
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Old 6th July 2019, 07:53 PM   #16
phase is online now phase  United States
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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.
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Old 6th July 2019, 09:13 PM   #17
tomchr is offline tomchr  Canada
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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.

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
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Old 13th August 2019, 04:49 PM   #18
nigelwright7557 is offline nigelwright7557  United Kingdom
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C7 is shorted out.
2020 versions of PCBCAD51, PCBCAD360 and PCBCAD720 out now >>> https://www.murtonpikesystems.co.uk
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PSA: Chipamp.com snubberized PSU schematic with part numbersHide this!Advertise here!
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