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Bonsai 12th May 2013 12:09 PM

Michael Kiwanuka's SOA PAper
Michael's SOA paper can be down loaded here

SOA Protection for Audio Power Amplifiers


michaelkiwanuka 12th May 2013 01:20 PM

Thanks Bonsai.:)

wahab 12th May 2013 01:38 PM

How to do a lot with few , i mean , quite an exaustive study
of output stage protection circuitry , the most complete i ve seen so far,
congrats , mike , for this usefull paper.

jan.didden 12th May 2013 01:48 PM

Excellent! I think I have prodded Michael for at least the last 10 years to publish his work on SOA. A very worthwhile read!


Bonsai 12th May 2013 02:41 PM

Jan, fully concur! :)

Bonsai 12th May 2013 02:41 PM


Originally Posted by michaelkiwanuka (
Thanks Bonsai.:)

My pleasure. Now get writing and publish! :)

Pingrs 13th May 2013 05:16 PM


Originally Posted by Bonsai (
My pleasure. Now get writing and publish! :)

Almost all that content was published in EW in Oct 2002. I've been using his VI limiter methodology in my Excel spreadsheets to build accurate protection ever since!


Walkalone 14th May 2013 04:13 PM

Very thank you, Bonsai!
It's very useful.

michaelkiwanuka 16th May 2013 10:11 PM

Has anyone considered SOA protection in which the protection transistors are removed from the forward path of the amplifier and, instead, opto-coupled to a bistable which drops out the output relay?

The protection locus would have to be conservative as it would have to accomodate the fact that it may take up to ten milliseconds to drop out the relay.

Bonsai 17th May 2013 12:09 AM

Use solid state relay. Fast (50-200 us), great repetitive current handling capability (100A no problem), and can handle inductive energy up to 500mJ.

Here is one example: Solid State Relay with PCB Layout

There are quite a few others on DIY audio as well.

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