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Old 17th May 2013, 01:25 AM   #11
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I am not sure why there is a "sudden" interest in SOA protection in numerous threads at the moment. Haven't we DIYers (not professional Electrical Engineers) known about this forever and deliberately decided to accept the risks? I can understand it being extremely important to Electrical Engineers designing consumer products.

Just a couple of points about "reference 3" in the paper. Elliott is spelt with 2 t's and Phil Allison is well known in Australia as a Toaster Repairman with a potty mouth, Phil Allison - Australia | LinkedIn.
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Old 17th May 2013, 10:05 AM   #12
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Originally Posted by Bonsai View Post
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.

Can those relays be used to turn off the supply rails instead of having them in series with the output?

In other words, if SOA protection is invoked or DC offset detected, then disconnect the DC supplies from the amplifier.

A latch would be necessary as you don't want the supply rails re-connected to the amplifier unless power is cycled.
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Old 17th May 2013, 10:11 AM   #13
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Originally Posted by Greg Erskine View Post
I am not sure why there is a "sudden" interest in SOA protection in numerous threads at the moment. Haven't we DIYers (not professional Electrical Engineers) known about this forever and deliberately decided to accept the risks?
Actually I suspect those folk who "accept the risks" do so because they don't know better. The purpose of the paper is to enlighten them.
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Old 17th May 2013, 10:20 AM   #14
dadod is offline dadod  Croatia
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Quote:
Originally Posted by michaelkiwanuka View Post
Can those relays be used to turn off the supply rails instead of having them in series with the output?

In other words, if SOA protection is invoked or DC offset detected, then disconnect the DC supplies from the amplifier.

A latch would be necessary as you don't want the supply rails re-connected to the amplifier unless power is cycled.
I use this(similar, a bit upgraded) power supplay with all needed protection. Power supply cap multiplier with electronic protection
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Old 17th May 2013, 11:00 AM   #15
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Yes, you could switch the rails - in fact it would probably be easier than the speaker. I have toyed with the idea but not organized my thoughts into a circuit yet.
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Old 17th May 2013, 11:14 AM   #16
dadod is offline dadod  Croatia
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Originally Posted by Bonsai View Post
Yes, you could switch the rails - in fact it would probably be easier than the speaker. I have toyed with the idea but not organized my thoughts into a circuit yet.
You can take a look at my circuit diagram and, maybe take some ideas from it(as I took some from JLH)
Power supply cap multiplier with electronic protection
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Old 17th May 2013, 02:05 PM   #17
Bonsai is offline Bonsai  Taiwan
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Thanks dadod.

There seems to have been a profusion of protection circuits lately - driven I believe by fast MOSFET switches, cheap bipolar output transistors and more use of simulators.
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Old 17th May 2013, 02:49 PM   #18
dadod is offline dadod  Croatia
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Thanks dadod.

There seems to have been a profusion of protection circuits lately - driven I believe by fast MOSFET switches, cheap bipolar output transistors and more use of simulators.
This one was built and it is in daily use in my TT amp with no problem, even ones saved my speaker coused by amp bad solder connection.
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Old 17th May 2013, 03:12 PM   #19
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You can take a look at my circuit diagram and, maybe take some ideas from it(as I took some from JLH)
Power supply cap multiplier with electronic protection

Thanks Dadod,

I'll look at it later.
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Old 18th May 2013, 12:22 PM   #20
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Dadod, I think you use a regulated power supply? There is no need for a regulated power supply for power amps.

The idea I proposed is to have solid state switches in the unregulated supplies of the amp. to disconnect them from the amp. in the event of SOA violation or DC offset.
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