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-   -   Simpelstark+ ODNF amplifier boards GB (https://www.diyaudio.com/forums/group-buys/341363-simpelstark-odnf-amplifier-boards-gb.html)

vzaichenko 14th August 2019 07:29 AM

Quote:

Originally Posted by outtek (https://www.diyaudio.com/forums/group-buys/341363-simpelstark-odnf-amplifier-boards-gb-post5883214.html#post5883214)
Hi, I am interested in the bundle kit no.3. One kit to be more precise.
Thanks,
Florin

Hi Florin,

Thank you - noted.

tuyen - 1x (1)
pinnocchio - 1x (1)
yogiDIYbear - 1x (1)
manniraj - 1x (1)
outtek - 1x (3)

Cheers,
Valery

cl00sed 14th August 2019 09:17 AM

tuyen - 1x (1)

pinnocchio - 1x (1)

yogiDIYbear - 1x (1)

manniraj - 1x (1)

outtek - 1x (3)

cl00sed - 2X (1)

PurpleTube 14th August 2019 10:21 AM

1X(3) please

touchdown 15th August 2019 10:31 AM

tuyen - 1x (1)

pinnocchio - 1x (1)

yogiDIYbear - 1x (1)

manniraj - 1x (1)

outtek - 1x (3)

cl00sed - 2X (1)

PurpleTube - 1X (3)

Touchdown - 1x (1)

twocents 15th August 2019 01:25 PM

I am very interested in 1 x (2), but have a question please - what toroids are needed here?

vzaichenko 15th August 2019 02:23 PM

Quote:

Originally Posted by twocents (https://www.diyaudio.com/forums/group-buys/341363-simpelstark-odnf-amplifier-boards-gb-post5884713.html#post5884713)
I am very interested in 1 x (2), but have a question please - what toroids are needed here?

Hi Twocents,

You can take this one as a "template":
AS-3435 - 300VA 35V Transformer - AnTek Products Corp

Power rating you need for the best performance is around 150-200VA per channel. 300VA one is fine assuming you still use 2 x PSU modules (1 per channel). The secondary voltage you need is 2 x 35...36V.

Cheers,
Valery

twocents 15th August 2019 03:46 PM

Cool, thanks Valery.
Another question - will you be shipping the boards from Moscow or Canada? I have an account with a shipping agent but they don't have a office in Moscow (yet).

xrk971 15th August 2019 03:47 PM

One note regarding toroidal power supplies is that using a single big one (300VA) with two CRC boards may tend to have ground loop hum. Quietest way is to have dual smaller trafos and dual CRCs. Use star grounding and isolate dirty Earth/chassis ground from clean 0v common power/analog ground with an NTC (CL60 etc) 22nF film cap.

The loop comes from the SE source input which usually has a common ground and that will tie the two grounds together causing hum.

vzaichenko 15th August 2019 03:50 PM

Quote:

Originally Posted by twocents (https://www.diyaudio.com/forums/group-buys/341363-simpelstark-odnf-amplifier-boards-gb-post5884840.html#post5884840)
Cool, thanks Valery.
Another question - will you be shipping the boards from Moscow or Canada? I have an account with a shipping agent but they don't have a office in Moscow (yet).

We ship from Canada. I recommend you to check the shipping options that will be offered at checkout - they are normally good.

Cheers,
Valery

vzaichenko 15th August 2019 04:04 PM

Quote:

Originally Posted by xrk971 (https://www.diyaudio.com/forums/group-buys/341363-simpelstark-odnf-amplifier-boards-gb-post5884843.html#post5884843)
One note regarding toroidal power supplies is that using a single big one (300VA) with two CRC boards may tend to have ground loop hum. Quietest way is to have dual smaller trafos and dual CRCs. Use star grounding and isolate dirty Earth/chassis ground from clean 0v common power/analog ground with an NTC (CL60 etc) 22nF film cap.

The loop comes from the SE source input which usually has a common ground and that will tie the two grounds together causing hum.

Thank you, X - a very valid comment.

In my prototype build, I used 2 x 200 VA transformers - having a true dual-mono as a result.

In case of a single transformer, star ground or T ground approaches show good results.


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