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sx-Amp and nx-Amp | diyAudio
https://www.diyaudio.com/community/threads/sx-amp-and-nx-amp.236522/
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.
sx-Amp and nx-Amp | Page 11 | diyAudio
https://www.diyaudio.com/community/threads/sx-amp-and-nx-amp.236522/page-11
The Ovation nx-Amplifier V2.0 A full set of boards as shipped is shown below. Circuit boards are professionally made, double-sided, solder mask and silkscreen top and bottom side, plated through holes. They are made from Gerber plots provided by Bonsai, the OP of this thread. nx-Amp PCB $10 each, $20/stereo set. plus shipping and Paypal fee
sx-Amp and nx-Amp | Page 4 | diyAudio
https://www.diyaudio.com/community/threads/sx-amp-and-nx-amp.236522/page-4
(I suspect there will be a few other things like this as more people build the nx-Amp - I will just update the doc as and when they come up.) With R34 and R35 set to 10k the TIS current is 28mA in simulation. However, I measured the values on my nx-Amp, and it is 43mA - quite a bit higher. There are two reasons for this 1.
sx-Amp and nx-Amp | Page 134 | diyAudio
https://www.diyaudio.com/community/threads/sx-amp-and-nx-amp.236522/page-134
2022-01-07 6:03 pm. #2,662. Heres is what I suggest you do (no load connected to the output) 1. Power up the amp. 2. set the lab PSU to 0V and connect it to the input (the amp is DC coupled) through a 10k resistor. 3. Adjust the lab PSU voltage up slowly while monitoring the output voltage of the amp. It should increase linearly with the input ...
sx-Amp and nx-Amp | Page 101 | diyAudio
https://www.diyaudio.com/community/threads/sx-amp-and-nx-amp.236522/page-101
The gain of the nx-Amp is 37x so with a little over 1V input, the amplifier output will swing to 40V peak, giving 100W RMS into 8 Ohms which was the design goal. Same logic applies in the sx-Amp which is powered off +-20 to 22 V rails - 1 volt input or thereabouts gives full output.
sx-Amp and nx-Amp | Page 113 | diyAudio
https://www.diyaudio.com/community/threads/sx-amp-and-nx-amp.236522/page-113
Bonsai, R6 is 1k (and this is the value I used when I got I=634mA) R20 is 2.2k (actually 2.19k) R21 is 1k (actually 0.997k) I checked Q11, it seems to be ok (without desoldering). 0.33 resistors are ok too (I saw in earlier posts they had to …
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