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Simpelstark+ ODNF amplifier boards GB
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Old 14th August 2019, 06:29 AM   #11
vzaichenko is offline vzaichenko  Russian Federation
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Simpelstark+ ODNF amplifier boards GB
Quote:
Originally Posted by outtek View Post
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
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Old 14th August 2019, 08:17 AM   #12
cl00sed is offline cl00sed  India
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tuyen - 1x (1)

pinnocchio - 1x (1)

yogiDIYbear - 1x (1)

manniraj - 1x (1)

outtek - 1x (3)

cl00sed - 2X (1)
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Old 14th August 2019, 09:21 AM   #13
PurpleTube is offline PurpleTube
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1X(3) please
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Old 15th August 2019, 09:31 AM   #14
touchdown is offline touchdown  Italy
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Location: Vicenza
tuyen - 1x (1)

pinnocchio - 1x (1)

yogiDIYbear - 1x (1)

manniraj - 1x (1)

outtek - 1x (3)

cl00sed - 2X (1)

PurpleTube - 1X (3)

Touchdown - 1x (1)
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Old 15th August 2019, 12:25 PM   #15
twocents is offline twocents  South Africa
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Simpelstark+ ODNF amplifier boards GB
I am very interested in 1 x (2), but have a question please - what toroids are needed here?
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Old 15th August 2019, 01:23 PM   #16
vzaichenko is offline vzaichenko  Russian Federation
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Simpelstark+ ODNF amplifier boards GB
Quote:
Originally Posted by twocents View Post
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
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Old 15th August 2019, 02:46 PM   #17
twocents is offline twocents  South Africa
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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).
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Old 15th August 2019, 02:47 PM   #18
xrk971 is offline xrk971  United States
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Simpelstark+ ODNF amplifier boards GB
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.
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Old 15th August 2019, 02:50 PM   #19
vzaichenko is offline vzaichenko  Russian Federation
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Simpelstark+ ODNF amplifier boards GB
Quote:
Originally Posted by twocents View Post
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
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Old 15th August 2019, 03:04 PM   #20
vzaichenko is offline vzaichenko  Russian Federation
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Simpelstark+ ODNF amplifier boards GB
Quote:
Originally Posted by xrk971 View Post
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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