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sx-Amp and nx-Amp
sx-Amp and nx-Amp
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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, and BOM updated 18th September 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.

Last edited by Bonsai; 18th September 2016 at 05:16 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
Greg Erskine is offline Greg Erskine  Australia
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sx-Amp and nx-Amp
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
OnAudio is offline OnAudio
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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  Europe
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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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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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