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Per-Anders Sjöström

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Power supplies / Re: Placement of regulator and...
Last post by Branko - April 16, 2024, 05:34:18 PM
thank you for answering.

If I then place the regulators as close as possible: could I place the transformers a bit away in separate enclosure? also regarding audio quality.

Best regards
Power supplies / Re: SSR01 input/output
Last post by thommy - April 16, 2024, 12:29:19 PM
So i tried to work it out and got it wrong, shorted the output to ground. The BC556 at the output has melted so I replaced it and can measure the correct output voltage again but when connecting it to a load the led goes dim and the LM317 gets hot, is anything else likely to have failed?

Interestingly the bench psu also craps out when the regulator has a load on it, dropping from 18v to 4v.

So SSR01 without load is fine.

Bench psu powering load directly is fine.

SSR01 and bench psu not happy under load.
Power supplies / Re: Placement of regulator and...
Last post by thommy - April 15, 2024, 01:36:12 PM
A year late,but you want to run the regulators as close as possible to the device. Youre basically running two antennas through other noisy gear and that is going to reinject noise into your low noise power line. I use silver plated ptfe coax cable and keep it as short as i can.
Power supplies / SSR01 input/output
Last post by thommy - April 15, 2024, 01:33:04 PM
I am reviving an old project and doing some rewiring. Nowhere on the SSR01 page can I find any mention of which connections are for power in and out! The schematic image is too low resolution to read anything and the downloads link just takes me to a Paypal site in Swedish which I cannot understand!
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Off topic / HealthAware: Raising Salubrity...
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Phono RIAA amplifiers / QSXM2 Input Transistor Biasing
Last post by MattB94 - October 05, 2023, 02:51:41 AM
Hi Per-Anders (and to anyone here who can answer this question),

First, just want to say thank you for all your good work designing all these things and making them available to us DIYers. On to the question...

I am planning on building a QSXM2 phono preamp, and I hope to optimize it for my Sumiko Blue Point No.3 MC cartridge. It has a fairly low output impedance, 28 ohms. I hope to bias the input transistors of the QSXM2 (so, T5-T12 and T17-T24) to 1mA, at least. Do I need to change anything? Presumably, I would alter the value of R16-R23 to something other than 15kohms. Should I change these resistors? Or something else?

Thank you for your help with this!
Power supplies / Re: Placement of regulator and...
Last post by Branko - June 18, 2023, 07:56:06 PM
Power supplies / Placement of regulator and tra...
Last post by Branko - April 03, 2023, 03:56:39 PM

I am in the process of building a streamer, a dac and a phono pre.
As I would like to have the enclosures as small as possible I would like to put some parts a little away.
Here is the question: could I put the transformers and or the super-regulators in separate enclosures away from the other items (some feet)?
How long could the dc line be and what cable to use?
If in separate enclosure would it be better to use normal transformer or toroidal type. Normal type would be also cheaper.

Best regards
Phono RIAA amplifiers / Re: QSX03 A new RIAA amp with ...
Last post by goldkenn - March 04, 2023, 09:05:31 AM
20230 =P