Schematic? Sundown SAZ-1500, Elevation Audio DX1500.1, RD 1750.1, Atomic AT-1600.1D - diyAudio
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Old 20th February 2012, 10:25 PM   #1
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Default Schematic? Sundown SAZ-1500, Elevation Audio DX1500.1, RD 1750.1, Atomic AT-1600.1D

Does anyone have any info on these amps?
They all use the same board, and I have a ReSponse branded amplifier here, that also uses the same board.

I've used two of these amps in the past at 0.5ohm daily, no issues, never went into protect, no matter how much abuse I gave them. Even blew all the fuses in one.

Nevertheless! I've recently bought two second hand, brand new, never used, amps, and they don't like 0.5ohm at all... and thats what I bought them to run at!

SO, I'm hoping to modify the protection circuit to make it less sensitive, a schematic would be excellent, or even just a little info.

Thanks for any input!
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Old 21st February 2012, 07:27 AM   #2
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I know you've used these amps in the past into 0.5 ohm but the manual states they are only stable down to 1 ohm. If you modify the protection cct surely you're going to cause more harm than good?
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Old 21st February 2012, 08:01 AM   #3
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I agree but if you can't use the amp like it's supposed to be used, find the 8 pin op-amp that has pin 4 connected to the negative rail. There will be a voltage divider across the shunt resistor. That voltage divider feeds the inputs of the 8 pin op-amp. Compare the resistors of that divider in the old and new amps. If they're the same, compare the voltage on the reference terminal. The reference terminal will be the input to the op-amp that has more voltage than the other input terminal. Measure the voltage with the black probe on the negative rail. The reference voltage will be very low (less than 0.2v, likely) so measure carefully.
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Old 21st February 2012, 11:24 AM   #4
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I don't think you mentioned where exactly the shunt resistor is
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Old 21st February 2012, 11:52 AM   #5
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They look like this in most amps.
Attached Images
File Type: jpg IMG_0165x.jpg (785.8 KB, 167 views)
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Old 21st February 2012, 11:55 AM   #6
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I figured they did.

It has four, all appear to be on the negative rail? is that correct?
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Old 21st February 2012, 11:58 AM   #7
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Probably so.
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Old 21st February 2012, 12:00 PM   #8
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ok, it seems that no opamp in the whole circuit has pin 4 connected to the negative rail.
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Old 21st February 2012, 12:03 PM   #9
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There should be one near those resistors. If not, follow the small traces away from those resistors to see if they lead you to an op-amp.

It may not be an 8-pin but I can' remember them using anything else.
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Old 21st February 2012, 12:05 PM   #10
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it only has 8 pin opamps.

Sundown SAZ 3000 D

is this the opamp I'm meant to be looking for? that section of the circuit is the same (or very similar) between the 1500, and 3000watt amps.
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