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Simpelstark+ ODNF amplifier boards GB
Simpelstark+ ODNF amplifier boards GB
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Old 12th August 2019, 07:20 PM   #1
vzaichenko is offline vzaichenko  Russian Federation
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Location: Moscow, Russia
Simpelstark+ ODNF amplifier boards GB
Arrow Simpelstark+ ODNF amplifier boards GB

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)

Click the image to open in full size.


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

Click the image to open in full size.


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

Click the image to open in full size.


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
Attached Images
File Type: jpg 02 Simpelstark PLUS V1.3 macro.jpg (871.0 KB, 743 views)
File Type: jpg 03 01KHz.jpg (456.7 KB, 742 views)
File Type: jpg 04 10KHz.jpg (443.6 KB, 159 views)
File Type: jpg 05 20KHz.jpg (427.7 KB, 124 views)
File Type: jpg 06 IMD_14-15KHz.jpg (457.4 KB, 112 views)
File Type: jpg 07 01KHz square.jpg (105.5 KB, 106 views)
File Type: jpg 08 20KHz square.jpg (101.3 KB, 98 views)
File Type: jpg 05.JPG (821.0 KB, 221 views)
File Type: jpg 07.jpg (285.5 KB, 294 views)
Attached Files
File Type: pdf Simpelstark AX2 Datasheet DIY.pdf (399.4 KB, 183 views)
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Last edited by vzaichenko; 27th September 2019 at 06:10 AM.
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Old 12th August 2019, 07:28 PM   #2
tuyen is online now tuyen  Australia
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1x (1) please!
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Old 13th August 2019, 04:48 AM   #3
pinnocchio is offline pinnocchio  Canada
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tuyen - 1x (1)
pinnocchio - 1x (1)
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Old 13th August 2019, 06:02 AM   #4
xrk971 is online now xrk971  United States
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Simpelstark+ ODNF amplifier boards GB
Hi Valery,

That’s a nice looking harmonic profile!

Click the image to open in full size.

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
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Last edited by xrk971; 13th August 2019 at 06:05 AM.
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Old 13th August 2019, 09:16 AM   #5
yogiDIYbear is offline yogiDIYbear  India
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1 x (1) for me. Thanks.
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Old 13th August 2019, 09:34 AM   #6
vzaichenko is offline vzaichenko  Russian Federation
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Simpelstark+ ODNF amplifier boards GB
Current list:

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

Cheers,
Valery
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Old 13th August 2019, 02:27 PM   #7
manniraj is offline manniraj  India
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yogiDIYbear - 1x (1)
manniraj - 1x (1)

Thanks
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Old 13th August 2019, 02:40 PM   #8
vzaichenko is offline vzaichenko  Russian Federation
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Simpelstark+ ODNF amplifier boards GB
Quote:
Originally Posted by xrk971 View Post
Hi Valery,

That’s a nice looking harmonic profile!

Click the image to open in full size.

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:
No-global-loop amplification

Simpelstark V1.1 post:
No-global-loop amplification

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
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http://vzaudio.com/

Last edited by vzaichenko; 13th August 2019 at 02:43 PM.
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Old 13th August 2019, 02:57 PM   #9
xrk971 is online now xrk971  United States
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Simpelstark+ ODNF amplifier boards GB
Thank you, Valery. This is good stuff!

Click the image to open in full size.
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Old 14th August 2019, 03:23 AM   #10
outtek is offline outtek
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Hi, I am interested in the bundle kit no.3. One kit to be more precise.
Thanks,
Florin
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