Power acoustik schematic

[brandes.cm]

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

[Perry Babin]

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.

[brandes.cm]

I did indeed, they are IRL540N. I see the L version is rated at 36 amps rather than 33. Is that the only difference?

[Perry Babin]

No. The L version has a 2v threshold while the standard FET has a 4v threshold.

[brandes.cm]

Hence the datasheet stating "logic level" gate. I will have to hunt down the parts, since a standard 540 doesn't seem to work!!!

[Perry Babin]

I used standard IRF540Ns in the one I repaired and didn't have any problems. Why didn't they work in your amp?

[brandes.cm]

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.

[Perry Babin]

The biasing likely needs to be set properly.

[brandes.cm]

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

[mbates14]

almost like one of the transistors isnt conducting at all? look at the drivers and double-make-sure