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Old 24th May 2013, 03:41 PM   #1
Bonsai is offline Bonsai  Taiwan
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Default sx-Amp and nx-Amp

Updated November 14 2014

I've put the complete Gerbers and drill files for the nx-Amplifier and sx-Amplifier up on my website hifisonix.com

If you want to make 'em, everything is there - look under the respective amplifier posts.


nx-Amplifier

100W RMS into 8 Ohms CFA class AB Amplifier featuring DC-570 kHz bandwidth, <1us rise times, ~200 V/us slew rate and low distortion. Uses +-45 to +-50V Power Supply. PSU +Protection board with Mosfet SSR provides overcurrent, DC offset and on/off muting.

The new V2.0 nx-Amplifier incorporates all of the errata changes and suggestions made by builders over the last year: Ovation nx-Amplifier: A 100 W class AB Current Feedback Amplifier

Download the nx-Amp V2.0 build document here The Ovation nx-Amplifier V2.0_9 | hifisonix.com

You can also buy a set of very high quality through hole plated, silk screened gold flashed V2.0 boards from Jim's Audio here: 100WX2 Ovation NX Current Feedback Amplifier PCB Set New Version 2 0 | eBay

The set includes 2 off amplifier boards and 1 off PSU +Protect board. Price excl. shipping is about $25.99. Note, the V2.0 boards are dimensionally the same as the original boards and the layout is the same but the silk screen has been updated.

sx-Amplifier

15W RMS into 8 Ohms class A CFA Amplifier featuring DC-530 kHz bandwidth, <1 us rise/fall time and slew rate of ~250 V/us (front end filter disabled). Uses a simple unregulated power supply of +-18-22V.

I have had a number of requests for sx-Amp boards from people who want to etch their own. You will find a single sided version of the sx-Amp board on my website - you can use this layout to etch your own boards. A component overlay is also included. The component numbers for the DSTHP and SS boards are the same.

For those of you that want to get your boards etched by a PCB company, here is the link to the Gerbers sx-Amp and nx-Amp

Here is the link to the sx-Amplifer build document Ovation sx-Amplifier: A 15 W class A Amplifier

On the sx-Amplifier build page, I also have links to DSTHP PCB Gerbers, for those of you that want something a bit more up-market. Currently these are not available to buy, so if you use them, you will need to arrange your own group buy.

ERRATUM - January 2015: in both the nx and sx Amplifiers, the output coupling inductor should be wound as follows: 10 turns on a 10mm diameter former using 1.6mm diameter wire. This gives the correct inductance of >0.5 uH (actually, ~0.6 uH - see post #1204 in this thread for the calculation)

If you have already built your ampifiers with the old winding details (yielding 0.4 uH) as per the documentation - do not change them. This erratum notice only applies to new builds.

Any questions, feel free to ask me


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Last edited by Bonsai; 7th January 2015 at 12:48 AM.
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Old 24th May 2013, 05:41 PM   #2
Bonsai is offline Bonsai  Taiwan
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The title should read sx-Amp and nx-Amp. The merlot is to blame.
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Old 24th May 2013, 09:53 PM   #3
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Brilliant work!
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Old 25th May 2013, 08:46 AM   #4
Bonsai is offline Bonsai  Taiwan
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Thanks Greg!

The merlot wasn't bad either - an Aussie 2007!
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Old 25th May 2013, 09:33 AM   #5
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nice
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Old 26th May 2013, 10:31 PM   #6
Holgi is offline Holgi  Germany
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Nice work, though I don't really like a merlot
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Old 26th May 2013, 10:59 PM   #7
PMI is offline PMI  United States
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This looks very cool! And, besides being very generous to post the gerbers (!), I can actually understand the description in the PDF file, without a secret decoder ring...
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Old 26th May 2013, 11:08 PM   #8
Bonsai is offline Bonsai  Taiwan
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Quote:
Originally Posted by Holgi View Post
Nice work, though I don't really like a merlot
Zinfandel? Cab?
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Old 26th May 2013, 11:09 PM   #9
Bonsai is offline Bonsai  Taiwan
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Quote:
Originally Posted by PMI View Post
This looks very cool! And, besides being very generous to post the gerbers (!), I can actually understand the description in the PDF file, without a secret decoder ring...
Thanks!
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Old 31st May 2013, 08:28 AM   #10
Holgi is offline Holgi  Germany
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Quote:
Originally Posted by Bonsai View Post
Zinfandel? Cab?
Cab is fine, though if I may choose freely (and without arguing with my gf) I'd rather go for a classic good ol' german beer
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