No-global-loop amplification

I use this.
I think that the led inside is for 12v.(led+resistor).
When first time testing,i used a discrete led.
I will try again with the discrete.
 

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Mistery solved!
There are 3 different situations.
OFF=the lowest luminosity.
ON at delay time=a little brighter.
Delay time passed=full luminosity.😉
In my previus test i haven't the rails connected so system don't passed to real ON.(FLASHING LED).
Here is the full setup.:drink:
 

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Yes this is obvious,i will ask different...there isn't a power loss circuit in this protection when
other speaker protection systems have a such circuit.
Why? 😕
PS no need because this protection act instandly when power shut down?
 
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This is a different than a simple speaker protection system. In normal operation the voltage loss detection circuit doesn't need to shut off the speaker relay, the microcontroller does this. If the DC detection circuit activates due to power loss it does instantly disconnect the speaker relay as a redundant protection at the same time as it signals problems to the microcontroller though.