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

Updated January 15 2016

I've put the complete write-ups for the nx-Amplifier and sx-Amplifier up on my website hifisonix.com

If you want to make 'em, including where to buy PCB's, 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. 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 PCB 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 V2.09 build document here The Ovation nx-Amplifier V2.0_9 | hifisonix.com

You can also buy a set of very high quality double sided through hole plated, silk screened gold flashed V2.0 boards from Jim's Audio here: http://www.ebay.co.uk/itm/100Wx2-Ova...item4adfee591b

sx-Amplifier

15W RMS into 8 Ohms current feedback class A amplifier, 28 Watts peak class A into 8 Ohms. DC-530 kHz (-3 dB) bandwidth, 140 V/us slew rate and rise times <1 us. Uses +-20V to +- 22V DC power supply . You can download the full amplifier write-up and build document here: http://hifisonix.com/the-sx-amplifier/ (updated March 2016)

You can buy a set of very high quality double sided, through hole plated gold flashed sx-Amplifier PCB's from Jim's Audio here: http://www.ebay.co.uk/itm/15Wx2-clas...item4af29feb25

Notes About Components

The BC547 and BC557 have been discontinued by a number of suppliers and this has lead to problems in both the sx-Amp and the nx-Amp for some builders.

In place of the BC547(C) NPN devices you can use the BC550(C) - data sheet here https://www.fairchildsemi.com/datasheets/BC/BC547.pdf

For the originally specified BC557(c) PNP devices you can use the BC560(c) - data sheet here https://www.fairchildsemi.com/datasheets/BC/BC557.pdf

You can use either the C suffix with an hFE range of ~400 to 800 or the B suffix with an hFE range of ~200 to 450. I suggest if you can use the C suffix, then that should be the first option. However, note that you should use the same hFE suffix for both the NPN and the PNP small signal transistors.
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Last edited by Bonsai; 20th July 2016 at 04:27 PM.
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Old 24th May 2013, 05:41 PM   #2
Bonsai is offline Bonsai  Europe
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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  Europe
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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
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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  Europe
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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  Europe
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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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