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Alpha Nirvana 39W SE Class A Amplifier GB
Alpha Nirvana 39W SE Class A Amplifier GB
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Old 16th January 2020, 04:49 AM   #81
andyr is offline andyr  Australia
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Quote:
Originally Posted by xrk971 View Post
This is the Group Buy and Build thread for the Alpha Nirvana 39W SE Class A amplifier designed by AKSA.

PCBs:
Click the image to open in full size.

Amp module looks like this assembled:
Click the image to open in full size.
Hi X,

Comparing the 'built' pic against the PCB pic ... am I right in thinking that only one of C102, 103, 104, 105 gets populated on the PCB?

In your case, the 10uF Wima was used?

Thanks,
Andy
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Old 16th January 2020, 05:16 AM   #82
xrk971 is offline xrk971  United States
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Alpha Nirvana 39W SE Class A Amplifier GB
Yes, C102,103,104,105 are all the same input coupling cap. Simply there to give you choices as to what cap package you can use. Yes, I have a 10uF Wima MKP there. A 10uF Silmic II at C105 can work very well and hardly costs anything.
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Old 16th January 2020, 05:57 AM   #83
andyr is offline andyr  Australia
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Quote:
Originally Posted by xrk971 View Post
Yes, C102,103,104,105 are all the same input coupling cap. Simply there to give you choices as to what cap package you can use. Yes, I have a 10uF Wima MKP there. A 10uF Silmic II at C105 can work very well and hardly costs anything.
Great - thanks, X.

Andy
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Old 16th January 2020, 01:02 PM   #84
SanjeevM is offline SanjeevM
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X,

Please consider adding a speaker protection circuit and relay on the amp board itself, it greatly simplifies wiring.
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Old 16th January 2020, 02:09 PM   #85
xrk971 is offline xrk971  United States
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Alpha Nirvana 39W SE Class A Amplifier GB
Hi Sanjeev,
If you like simplicity, please consider the ABBB amp. Very similar to the Alpha Nirvana, but 50w capable and has built in SLB and SSR DC protection and delay circuit. You just need to connect a trafo and speakers. It also has output MOSFETs and Cap Mx BJTs on quick connect Molex for remote mounting.

The Alpha Big Boy with Buttah (ABBB) 52w Class A Amp GB

Here is one channel of Vunce’s build:
Click the image to open in full size.
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