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Old 29th April 2020, 06:19 PM   #51
minek123 is online now minek123  United States
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Elvee, can you elaborate on this? A practical schematic perhaps?
This seems like easiest and cheapest speaker protection that
I can build into speakers, instead of adding new protection circuits
into each amp I build..
Either regular fet with batteries, or power depletion fet.
Perhaps this fet would do (without batteries):
IXTH10N100D2
It's expensive, but if it's gonna solve the problem once and for all....
It seems easier than your ASPv2...



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If you do, please include as many cases/outlines as possible: oranges are not the only fruit, and the CPC's are not the only depletion MOSFet around.

Another option that might also be desirable (perhaps a different PCB) is a "false" depletion FET: a regular, dirt-cheap enhancement FET having permanently connected 3 lithium button cells directly in series with the gate.
OK, not a true depletion device, but will behave so for the next 20 or 40 yrs: just the shelf life of the cells
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Old 24th May 2020, 02:00 PM   #52
Elvee is online now Elvee  Belgium
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Sorry, I now realize that I was over-enthusiastic: the circuit cannot possibly work as intended, because of the body diodes of the FETs.


If the input and output are reversed, it could act as a current-limiter, because the depletion FETs will combine with the load resistance to form a CCS, but current will still flow and will be determined by the pinch-off voltage of the FETs.

I do not see a simple way to remedy the problem, unfortunately
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Old 24th May 2020, 02:58 PM   #53
minek123 is online now minek123  United States
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Thanks Elvee.
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Old 24th May 2020, 04:33 PM   #54
minek123 is online now minek123  United States
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Quote:
Originally Posted by Elvee View Post
Sorry, I now realize that I was over-enthusiastic: the circuit cannot possibly work as intended, because of the body diodes of the FETs.
What if each FET is replaced by 2 FETs in sequence in opposite directions?
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Old 25th May 2020, 11:13 AM   #55
Elvee is online now Elvee  Belgium
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I bent and twisted the circuit in every possible way, and the least worst configuration I found was the one I posted.

When something looks too good to be true, it probably is.

There are bright people on this forum, and maybe someone else will see the light and come up with an acceptable solution......
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Old 25th May 2020, 12:16 PM   #56
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The better way to use mosfets as speaker protectors is to use them to open the rails to the output stage. Only to the output stage, and open both simultaneously. Leave a DC feedback path intact (fior very low output current of course). If the fault clears (ie, it was your subsonic input signal causing it) it can be made to automatically reset. The body diodes won’t cause any trouble - in fact you need them if it operates with an inductive load like a speaker with a lagging phase angle. Unfortunately, this technique has to be designed into the amplifier, not something that can be easily added on to some kit without modifying it.
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