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Old 3rd March 2017, 11:15 AM   #1
luigidedom is offline luigidedom  United Kingdom
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Default Audio driver board

On these boards which resistor is changed to make protection less sensitive
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Old 3rd March 2017, 12:00 PM   #2
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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Circuit?
Make?
Model?
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Old 3rd March 2017, 01:17 PM   #3
Perry Babin is offline Perry Babin  United States
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R30
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Old 3rd March 2017, 06:53 PM   #4
luigidedom is offline luigidedom  United Kingdom
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Sundown 3500
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Old 3rd March 2017, 06:55 PM   #5
luigidedom is offline luigidedom  United Kingdom
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Perry, Increase or decrease value of R30?
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Old 3rd March 2017, 06:58 PM   #6
Perry Babin is offline Perry Babin  United States
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Are you sure that you want to make the protection circuit less effective?

If you lower the value, the threshold for shutdown will be lower (it will shut down sooner). Increase the value to make the amp less reliable.
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Old 4th March 2017, 03:08 AM   #7
luigidedom is offline luigidedom  United Kingdom
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The amp is being used purely for spl it shutting down just before the end of the roll so just need to increase that threshold. R30 on this amp is 3k9 I see on some other similar boards its 4k7
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Old 4th March 2017, 03:43 AM   #8
Perry Babin is offline Perry Babin  United States
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390, not 3.9k
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Old 4th March 2017, 04:27 AM   #9
Perry Babin is offline Perry Babin  United States
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Side note... The resistor value AND the shunt resistor value determine the shutdown. You cannot compare the value of R30 to other amps unless they use the exact same shunt resistors. Even then, if the output configuration and rail voltage are different, the value of R30 may be different.

Increasing its value will do what you want but you should tell the owner that here is a risk of much greater damage if/when the outputs fail.
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Old 5th March 2017, 05:02 AM   #10
luigidedom is offline luigidedom  United Kingdom
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Correction yes 390 and 470 and yes the owner is aware of the consequences. I have told him to check the impedance at the frequency and that his box or port is more than likely the problem and not the amp. But you know these spl guys know it all when it comes to box design......
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