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Old 19th January 2010, 11:54 PM   #1
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Default Power acoustik schematic

I have a BAMF1600/4 series that I would like a schematic for. I sent off an email to Power Acoustik and haven't heard anything.

I am more interested in the output config, it uses all irf540's. Not what I am used to seeing. So any schematic with that config would be useful.

Thanks,
cory
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Old 20th January 2010, 12:04 AM   #2
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The last time I requested a schematic for this series, they wouldn't release it because it was still in production.

Did you misread the part number? In the 2200/2 I repaired, it had IRL540Ns in it.
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Old 20th January 2010, 12:22 AM   #3
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I did indeed, they are IRL540N. I see the L version is rated at 36 amps rather than 33. Is that the only difference?

Last edited by brandes.cm; 20th January 2010 at 12:26 AM.
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Old 20th January 2010, 12:41 AM   #4
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No. The L version has a 2v threshold while the standard FET has a 4v threshold.
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Old 20th January 2010, 01:12 AM   #5
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Hence the datasheet stating "logic level" gate. I will have to hunt down the parts, since a standard 540 doesn't seem to work!!!
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Old 20th January 2010, 02:45 AM   #6
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I used standard IRF540Ns in the one I repaired and didn't have any problems. Why didn't they work in your amp?
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Old 20th January 2010, 01:21 PM   #7
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They did work I guess. I just noticed the lower half of the signal being clipped prematurely. Not using the same part made me think it was the replacement parts fault. I need to look a little further into this amp.
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Old 20th January 2010, 07:11 PM   #8
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The biasing likely needs to be set properly.
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Old 21st January 2010, 02:18 AM   #9
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Here is a pic of the board. It has bias test points for all 4 channels, what am I looking for on those. Right now they all read differently. When I adjust the bias pot for channel one, it will pop a 10 amp fuse when adjusting in either direction. With Rockford amps I just put a voltmeter across my .005ohm series resistor in my supply line and watch for the mV's to shoot up, then adjust back a little. I don't see that spike with this amp.

When I load channel 1 with 3 ohms I lose the lower half of the sine wave. Unloaded I can get ~22Vrms out, normal channel is 24.5Vrms.

cory
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Old 21st January 2010, 02:27 AM   #10
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almost like one of the transistors isnt conducting at all? look at the drivers and double-make-sure
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