Question about Hifonics Brutus BX 1505D Car Audio Amplifier

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Hifonics Taurus circuit diagra???

I got this hifonics taurus amp which is bein a pain. protect light comes on and i've traced the problem to the final power transistors (it uses the TIP35C MOSFETS). I replaced the faulty power transistor and when I hook it up it overheats the same component. i done a pretty detailed search around the affected area but all components seem to be intact. voltage regulators and such seem to be in order and everything else is throwing me off track.

does anyone have a wiring diagram for this sort of amp, or any suggestions at all would be welcomed.


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  • andreyi Apr 09, 2008

    hey thanks for the help.
    i cannot keep the power on it longer than let's say 10 seconds or the MOSFET will overheat and die so i can only do "cold" measurements.

    the power light stays on for a few seconds at startup, after which it switches onto protect.

  • andreyi Apr 10, 2008

    you were right, the protection circuit didnt kick in but a couple of resistors from the "previous stage" started smoking (couldnt get any readings).
    The "driver" stage seems to be intact, I've also replaced BJTs along the track thinking that they might be at fault but same result. Recon it could be something in the pre-amp stage?

    and just for my were talking about removing ONLY the affected MOSFET to take the readings ???



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You need to measure the voltages at the output transistors. The previous "driver" stage may have a problem. These outputs use .6V as the bias differential. Check for DC voltage on the inputs to the transistors. These are standard designs. I'd check for DC anywhere along the signal path.

Posted on Apr 09, 2008

  • ABRsvcs Apr 09, 2008

    My original post got clipped. Remove the output transistors before you take the measurements. With no current draw, the protection circuit won't kick in.



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