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Old 18th June 2017, 07:21 AM   #21
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Quote:
Originally Posted by sajti View Post
I use separated small transformer for the speaker protection. I cost approx. 2Euro, and PCB mounted.
Same here, adapted from a Buildaudioamps schematics.

Jacques
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Old 18th June 2017, 07:38 AM   #22
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by JRKO View Post
Do these little guys protect against turn off thump? I have some compression drivers I'd rather not destroy
delay to ON and instant OFF isolates the speaker before tha amplifier starts to shut down.

Instant OFF requires detection of the AC waveform and that loss of AC triggers the circuit.

This can be used for input mute of a Power Amplifier and can also be used as an output mute of a Source.
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Old 18th June 2017, 08:34 AM   #23
sajti is offline sajti  Hungary
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Originally Posted by AndrewT View Post
Instant OFF requires detection of the AC waveform and that loss of AC triggers the circuit.
Or simply use the smallest possible capacitor in the protection PSU. I use 470uF only, followed by common 3 terminal regulator.

Sajti
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Old 18th June 2017, 08:37 AM   #24
AndrewT is offline AndrewT  Scotland
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too slow.
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Old 18th June 2017, 10:21 AM   #25
thimios is offline thimios  Greece
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Originally Posted by jacques antoine View Post
Same here, adapted from a Buildaudioamps schematics.

Jacques
Can you share files,pcb and schematic?
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Old 18th June 2017, 10:23 AM   #26
sajti is offline sajti  Hungary
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too slow.
No. It works well in practice.

Sajti
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Old 18th June 2017, 10:29 AM   #27
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Not a universal solution. AC detection is the only way to be certain of the fastest possible off.
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Old 18th June 2017, 10:34 AM   #28
sajti is offline sajti  Hungary
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Not a universal solution.
No, but easy to adopt, and easy to try in practice.

Sajti
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Old 18th June 2017, 10:39 AM   #29
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Quote:
Originally Posted by thimios View Post
Can you share files,pcb and schematic?
Hi Thimios,
Other Audio Related Projects | BuildAudioAmps
For the BOM you have to subscribe (it's free).
Cheers,
Jacques
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Old 18th June 2017, 10:47 AM   #30
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Quote:
Originally Posted by AndrewT View Post
too slow.
You should use very low Z relays without any capacitor after the rectifier.

PS : others should try to plug and unplug several times their boards to see what happened
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