Hifonics Brutus BXi 2608D

Dr Zeus · 10th June 2011, 04:31 AM

Ive got this amp in for repair which I'm very close to fixing. It came in with about $50 worth of damaged parts, from a dozen IRFP064N ps fets and drivers to another dozen IRF640/9640 outputs.

Taking what I learned about a weak driver circuit from a Crunch ground pounder here: Crunch Ground Pounder GP1500D, I modified the PS drive circuit for use with BD139/BD140 drivers, and bridged the 500 ohm R60 and R60A. In the previous Crunch amp with similar power supply doing this increased the drive circuit of the PS. I also used 47ohm gate resistors on the IRFP064N fets (down from 100 ohms). This slight modification appears to be working just fine for now... except...

The amp powers and idles just fine (does not heat up), and will probably play audio as it has +-80 dc rail voltage. I am however affraid to keep it powered for very long because the output of the ps is running unregulated at the moment.

I temporarilly removed the R60/R60A jumper so the circuit is now back with 500ohm and the PS still operates unregulated

Perry Babin · 10th June 2011, 04:48 AM

Do you know for a fact that it has a regulated power supply?

What are the rail caps rated for?

What is the DC voltage at the B+ and ground terminals?

Dr Zeus · 10th June 2011, 05:05 AM

Well I'm not 100% sure, but this amp is one of the largest MaxxSonics amps I've had on my bench in awhile. Its got 12 power fets and 20 IRF640/9640 outputs so its pretty large I'd say. This one in particular also says "25th aniversary 2600 Watts Super D_Class Mono" on the case. I think I remember the crunch amp being regulated.

Rail caps are 100V 3300uF

I'm using a 10A power supply for rebuilding this amp, which natually measures 13.75v with nothing connected. Powering this amp is not a problem, and the voltage only drops to 13.6 across B+ and Ground.

Perry Babin · 10th June 2011, 05:08 AM

Well.. Maybe it's regulated but only to protect the rail caps or the outputs (both of which can take ±100v). If that's the case, there would be no reduction of pulse width at ±80v.

gizmo1961 · 14th June 2011, 03:44 PM

Dr Zeus that amp is similar to the one I am working on now. What went wrong with it just the power supply? Is it in working condition now?

Dr Zeus · 15th June 2011, 03:25 AM

yes i fixed it the other day. it needed a whole new power supply from drivers, gates, and fets also about half the outputs. what happened to yours¿

gizmo1961 · 16th June 2011, 03:34 AM

My output is just fine and so are the rectifiers and caps. The only thing that failed for the second time is the fets and drivers in the power supply. The reason it failed the first time I was running an Orion HCCA 15.2 wired at 1 ohm and the battery under my hood failed. The voltage fell drastically and the amp drew too much current and the power supply fets went out. Stupid me for not having an inline fuse. I do now

10th June 2011, 04:31 AM	#1
Dr Zeus diyAudio Member Join Date: Oct 2010	Hifonics Brutus BXi 2608D Ive got this amp in for repair which I'm very close to fixing. It came in with about $50 worth of damaged parts, from a dozen IRFP064N ps fets and drivers to another dozen IRF640/9640 outputs. Taking what I learned about a weak driver circuit from a Crunch ground pounder here: Crunch Ground Pounder GP1500D, I modified the PS drive circuit for use with BD139/BD140 drivers, and bridged the 500 ohm R60 and R60A. In the previous Crunch amp with similar power supply doing this increased the drive circuit of the PS. I also used 47ohm gate resistors on the IRFP064N fets (down from 100 ohms). This slight modification appears to be working just fine for now... except... The amp powers and idles just fine (does not heat up), and will probably play audio as it has +-80 dc rail voltage. I am however affraid to keep it powered for very long because the output of the ps is running unregulated at the moment. I temporarilly removed the R60/R60A jumper so the circuit is now back with 500ohm and the PS still operates unregulated

10th June 2011, 04:48 AM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Do you know for a fact that it has a regulated power supply? What are the rail caps rated for? What is the DC voltage at the B+ and ground terminals? __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

10th June 2011, 05:08 AM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Well.. Maybe it's regulated but only to protect the rail caps or the outputs (both of which can take ±100v). If that's the case, there would be no reduction of pulse width at ±80v. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

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10th June 2011, 05:05 AM	#3
Dr Zeus diyAudio Member Join Date: Oct 2010	Well I'm not 100% sure, but this amp is one of the largest MaxxSonics amps I've had on my bench in awhile. Its got 12 power fets and 20 IRF640/9640 outputs so its pretty large I'd say. This one in particular also says "25th aniversary 2600 Watts Super D_Class Mono" on the case. I think I remember the crunch amp being regulated. Rail caps are 100V 3300uF I'm using a 10A power supply for rebuilding this amp, which natually measures 13.75v with nothing connected. Powering this amp is not a problem, and the voltage only drops to 13.6 across B+ and Ground.

14th June 2011, 03:44 PM	#5
gizmo1961 diyAudio Member Join Date: Jun 2011	Dr Zeus that amp is similar to the one I am working on now. What went wrong with it just the power supply? Is it in working condition now?

15th June 2011, 03:25 AM	#6
Dr Zeus diyAudio Member Join Date: Oct 2010	yes i fixed it the other day. it needed a whole new power supply from drivers, gates, and fets also about half the outputs. what happened to yours¿

16th June 2011, 03:34 AM	#7
gizmo1961 diyAudio Member Join Date: Jun 2011	My output is just fine and so are the rectifiers and caps. The only thing that failed for the second time is the fets and drivers in the power supply. The reason it failed the first time I was running an Orion HCCA 15.2 wired at 1 ohm and the battery under my hood failed. The voltage fell drastically and the amp drew too much current and the power supply fets went out. Stupid me for not having an inline fuse. I do now

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