diyAudio

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

xrk971 20th September 2019 10:22 PM

Nice input board. Is it a bal to single converter?

jwilhelm 20th September 2019 10:44 PM

I have two versions of surface mount speaker relay boards. The standard board has hole spacings for normal 3/4" (19mm) binding posts with #10 hole size. We also have a version with 30mm spacing 8mm diameter holes for larger binding post like the ones available on our website. If anyone would prefer the alternate hole spacing please let me know.

jwilhelm 20th September 2019 10:45 PM

Quote:

Originally Posted by xrk971 (https://www.diyaudio.com/forums/group-buys/341363-simpelstark-odnf-amplifier-boards-gb-post5920791.html#post5920791)
Nice input board. Is it a bal to single converter?

Thanks X. It's selectable balanced or single end input, single out. THAT1206.

meanman1964 21st September 2019 08:51 AM

What is this amp using as output fets or bjt ?

thimios 21st September 2019 09:09 AM

Quote:

Originally Posted by jwilhelm (https://www.diyaudio.com/forums/group-buys/341363-simpelstark-odnf-amplifier-boards-gb-post5913030.html#post5913030)
I've managed to test most of the boards. Simpelstark and the supplies are good. There's a bug in the Amp Control boards, I'll have replacements early next week. I haven't managed to test the new input adapter board yet, I hope to do that in the morning. I should be able to start shipping out some of the orders tomorrow.

Nice looking pcb & parts fitting!:cool:
I see polygon ground plane but i can't see well if used as gnd referance.

jwilhelm 21st September 2019 10:04 AM

Quote:

Originally Posted by meanman1964 (https://www.diyaudio.com/forums/group-buys/341363-simpelstark-odnf-amplifier-boards-gb-post5921071.html#post5921071)
What is this amp using as output fets or bjt ?

This amp version uses BJT drivers and outputs. The original used latfet drivers.

jwilhelm 21st September 2019 10:14 AM

Quote:

Originally Posted by thimios (https://www.diyaudio.com/forums/group-buys/341363-simpelstark-odnf-amplifier-boards-gb-post5921082.html#post5921082)
Nice looking pcb & parts fitting!:cool:
I see polygon ground plane but i can't see well if used as gnd referance.

There's no easy answer to a grounding question on a balanced adapter! The planes are power supply ground and ground reference for the THAT 1206 IC. To avoid ground loop issues the audio ground itself isn't directly connected to this plane. I'm going to write up the build guide for this over the weekend with an explanation how to properly connect this board. I spent a lot of hours at the test bench experimenting for best results. The noise floor drops dramatically when using the XLR connection but wiring is critical.

thimios 21st September 2019 12:15 PM

Oh sorry Jeff, i ask for the polygon ground plane (upper side) that i see in amplifier pcb. :)

jwilhelm 21st September 2019 12:22 PM

Quote:

Originally Posted by thimios (https://www.diyaudio.com/forums/group-buys/341363-simpelstark-odnf-amplifier-boards-gb-post5921171.html#post5921171)
Oh sorry Jeff, i ask for the polygon ground plane (upper side) that i see in amplifier pcb. :)

On the amp, yes that's signal ground.

vzaichenko 21st September 2019 04:32 PM

Quote:

Originally Posted by meanman1964 (https://www.diyaudio.com/forums/group-buys/341363-simpelstark-odnf-amplifier-boards-gb-post5921071.html#post5921071)
What is this amp using as output fets or bjt ?

Hi Meanman,

This version (v1.3) utilizes the class AB OPS with wider than normal class A region. Outputs configuration may look like CFP at a first glance but it's not. Configuration with "helper" transistors used here is rather low distortion open loop - that was my intention for this amplifier.

You can download the schematic if you register in the store - just let me know as soon as you create your account, I will give you the access for downloading the docs (manual procedure).

Cheers,
Valery


All times are GMT. The time now is 10:42 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 17.65%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright ©1999-2020 diyAudio

Wiki