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

vzaichenko 12th August 2019 07:20 PM

Simpelstark+ ODNF amplifier boards GB
 
10 Attachment(s)
GB ordering is OPEN!

OK buddies, I'm opening ordering for the GB a little bit in advance - right now!
Please make your order via the web store at:

Simpelstark GB - Virtual Zero Audio Store

The reason I'm asking to do it that way - our shipping process is pretty much automated with the tools in the store, plus you will be able to specify the address and choose the preferred delivery method for your convenience.

Please put the desired products to the shopping cart, adjust the quantity if required, and proceed to checkout.
All the GB products are visible at the top of the front page.

Please specify the discount code at the checkout: DIYAUDIO

It will drop 25% off the price of the boards, resulting in the prices, announced earlier. It will not affect the price of jFETs though.

Please let me know if you will have some questions / need assistance with the process.

Cheers,
Valery

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ORIGINAL MESSAGE ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Simpelstark+ ODNF V1.3 is one of my favorite amplifiers, providing unprecedented sound quality at a wide range of listening volumes, from low volume ambient background to high-power focused listening. The amplifier is greatly appreciated by a number of DIY enthusiasts around the globe.

For more details about the design specialties and detailed characteristics please see the attached datasheet.

GB is available for 3 kinds of a bundle:


1) 2 x Simpelstark amplifier PCBs ($26.18)

https://cdn.shopify.com/s/files/1/00...ndle_0.png?986


2) 2 x Simpelstark amplifier + 2 x Compact PSU PCBs ($49.43)

https://cdn.shopify.com/s/files/1/00...ndle_1.png?986


3) 2 x Simpelstark amplifier + 2 x Compact PSU + Amp Control System V6.2.2 (full set of 5 boards) PCBs ($69.68)

https://cdn.shopify.com/s/files/1/00...ndle_2.png?986


Build Guides and technical support during the build will be available as usual.

The prices are shown for the case of reaching the quantity of around 50 bundles.
Orders will be taken via the Virtual Zero Audio Store. Shipping options will be available at checkout - normally it's around $15 for the most of international locations unless you choose some expedited delivery option.

Please express your interest here in the thread. I will open a special discount for placing the orders as soon as we get enough participants.
Don't hesitate to ask questions.

Cheers,
Valery

tuyen 12th August 2019 07:28 PM

1x (1) please!

pinnocchio 13th August 2019 04:48 AM

tuyen - 1x (1)
pinnocchio - 1x (1)

xrk971 13th August 2019 06:02 AM

Hi Valery,

That’s a nice looking harmonic profile!

https://www.diyaudio.com/forums/atta...b-03-01khz-jpg

Is there a thread or post somewhere explaining the “Only Distortion Negative Feedback” ODNF concept - with schematic? It sounds really interesting.

I have too many amp projects in the queue already, otherwise would probably sign up for this.

Cheers,
X

yogiDIYbear 13th August 2019 09:16 AM

1 x (1) for me. Thanks.

vzaichenko 13th August 2019 09:34 AM

Current list:

tuyen - 1x (1)
pinnocchio - 1x (1)
yogiDIYbear - 1x (1)

Cheers,
Valery

manniraj 13th August 2019 02:27 PM

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

Thanks

vzaichenko 13th August 2019 02:40 PM

Quote:

Originally Posted by xrk971 (https://www.diyaudio.com/forums/group-buys/341363-simpelstark-odnf-amplifier-boards-gb-post5882157.html#post5882157)
Hi Valery,

That’s a nice looking harmonic profile!

https://www.diyaudio.com/forums/atta...b-03-01khz-jpg

Is there a thread or post somewhere explaining the “Only Distortion Negative Feedback” ODNF concept - with schematic? It sounds really interesting.

I have too many amp projects in the queue already, otherwise would probably sign up for this.

Cheers,
X

Hi X!

Here is the initial thread:
No-global-loop amplification

Here is the post with some theory:
https://www.diyaudio.com/forums/soli...ml#post5328425

Simpelstark V1.1 post:
https://www.diyaudio.com/forums/soli...ml#post5347597

Very good discussion with Brian (traderbam) and Hugh (in the background) helped a lot to clarify my own understanding of what really happens in ODNF setup.

Version 1.1 was tested very successfully, however, later on, I introduced some further improvements in the output stage - current version is V1.3 (you can see the building guide with schematic in the store, being logged in).

The key idea - design an amplifier as linear as you can, having no global loop at all, providing the gain you need (e.g. 29db), and then add 18-20db of ODNF (overall gain will not change).

This is the very promising approach - I continue working on some pretty cool new designs, based on it.
If you will have some questions - please let me know.

Cheers,
Valery

xrk971 13th August 2019 02:57 PM

Thank you, Valery. This is good stuff!

https://www.diyaudio.com/forums/atta...nf-formula-jpg

outtek 14th August 2019 03:23 AM

Hi, I am interested in the bundle kit no.3. One kit to be more precise.
Thanks,
Florin


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