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Old 25th September 2013, 07:49 PM   #1
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Default Digital Designs - Z1, removing short circuit protection?

I'm wanting to remove, or desensitise the short circuit/low impedance circuit in two of these amps..

Basically, what happens is, the better the supply voltage/current I have available, the more the amps go into protect...

More input voltage = more output voltage = more output current = more protect...

I haven't even looked into how they do this part of the protect circuit, so I'll look into that now and probably update this thread, but if someone has done this before, or could guide me in the right direction, that would be great.

Thanks!
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Old 26th September 2013, 12:17 AM   #2
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R30 on the driver board (270 ohms) sets the reference. Increase the value slightly to reduce the sensitivity. I wouldn't expect the outputs to survive long if driven for long periods of time where the original protection circuit set point was causing it to shut down.
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Old 26th September 2013, 12:21 AM   #3
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I've hammered on these amps with insufficient battery, and not had issues with protect... the issue was always when I added more batteries, they'd go into protect...

Running them at 0.5ohm daily....
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Old 26th September 2013, 12:26 AM   #4
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I assume you mean the amplifier driver board, not the power supply driver board.

based on the photo I have, R30 isn't 270ohm.
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Old 26th September 2013, 12:30 AM   #5
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Audio driver. Does it have 2 driver ICs or 4 driver ICs?
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Old 26th September 2013, 12:32 AM   #6
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it has four IR2184's
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Old 26th September 2013, 12:35 AM   #7
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It appears that R30 on either driver board is 270 ohms.
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Old 26th September 2013, 12:36 AM   #8
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I dont know what amp you're looking at, but R30 appears to be 20k
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Old 26th September 2013, 03:49 AM   #9
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On driverboard with 4x21844 (v20) R30=330/1%
R30=270/1% on 2x21844 (dwm3640v30/v40)

but ThyDntWntMusic talking about dd z1, not z1a

UPD: ThyDntWntMusic, on driverboard find something like that
Click the image to open in full size.

Last edited by SPLing; 26th September 2013 at 03:58 AM.
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Old 26th September 2013, 04:26 AM   #10
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What resistor would you change on the above diagram?

I had already found the part of the circuit that looks like that, and thought it was probably R80 or R62 (on the above diagram) that I should change... both of which are 330ohm on my board.
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