Why did my amp get crispy? pics inside

[techforce]

It went up in smoke becasue:

The amp was ran at too low of an impedance.

The amp was ran hot due to clipping or some other reason, and protect circuit didnt catch it, or failed.

The amp had a lose power or ground.

The amp dipped to low on voltage.

The amp was vibrated to death, and with vertical mosfets they break easily and cause a chain reaction.

You could of blew a sub, and protect circuit didnt catch it and the woofers voice coil created a dead short on the amp.

Looking at the amp it seems like the powersupply went out, killing all the mosfets or most of them, and gate resistors.

Repair costs are ruffly $150-$225 from db-r electronics.

PSU was my take on it also... good breakdown bro!

[techforce]

I always try to run 300's cause a dead short will cause any fuse to pop, so why not have less current resistance... something iraggi had preached to me while spending time at his shop...

[audiofanaticz]

low voltage and running too small of fuses for the comps... at least get a battery back there... fuck the bullship burp box rules and try to run your amp with a 20 amp fuse... that fuse popping is a sign of a strain on the entire system, the fuse, cant pass enough power to the amp and the amp suffers... II will run 300 or 200 or none

Too small of a fuse on your amp will not cost the amp to fry. Your theory sounds correct, but it is wrong

Running a small fuse will not limit the amount of voltage or current going thru it. Ill break it down more below.

But yes, I agree a rear battery is needed!!

You toasted the power supply section... Thermal runaway is a bitch. B is right about the reasons why.

Im always right bro

I fried my fair share of things in the past, sometimes on purpose, sometimes accident or just not caring. LOL

caused by excessive gain?

Excessive gain and or bassboost.

PSU was my take on it also... good breakdown bro!

Thank you

I always try to run 300's cause a dead short will cause any fuse to pop, so why not have less current resistance... something iraggi had preached to me while spending time at his shop...

Fusing...

Is it needed, of coarse!

But will it stop a amp from blowing? No

If something is going to blow, it will blow reguardless if there is a fuse inline on the power wire, or the amp itself, you could have 10 fuses on your 1 amp, but it wont stop the amp from releasing magic smoke, but will create a good amount of resistance thru your power wire. All fuses are ment for is protecting your vehicle from catching fire incase your power wire shorts out.

The way fuses are created is to allow current to flow thru them. Each one is designed for its desired current flow needs and not blowing when being used at their max load (300amps in this case).

Generally a dead short will not blow the fuse immediately. I encourage you to take a 300amp fuse and holder, connect 2 pieces of wire to it, and arch it a few times across a high rate agm battery (like a XS Power D3100 which max short circuit amps is 5000). More then likely if you dead short this fuse on this battery, you will see around 5000amps of current go thru it for a split second and it will not blow.

A 300 amp fuse generally will not blow until it sees about 375-400+ amps of current for a good 5 seconds or so (sometimes longer, sometimes shorter. Every brand of fuse is different). At this point your shorted wire had enough time to get very hot and could easily start to melt your carpets or anything else along the run of power wire, or worst start a small fire.

So the question is, does a 3000wrms amp need 300 amps of fusing? No, You could be perfectly safe with a 200amp fuse.

As most of us should know by now a amp will almost never make rated power after you calculate impedance rise into the equation.

Now if you add a rear battery or two this will result even a smaller fuse being needed on your main power wire(s) Since electricity will flow the path of least resistance. Which results in your amp pulling most its needed current from the rear batteries putting less strain on your power wire going front to back.

/essay done,

hopefully its some waht decent, pretty tired. lols

[skittlesRgood]

get it fixed quick before the world runs out of mosfets.

[Boon]

get it fixed quick before the world runs out of mosfets.

Too late

Honestly although the smoking part is in the power supply I would say dollars to donuts there will be a shorted out part in the output section.

Vertical mosfets + spring clips without the super duper DB-R strengthening technique means the output FETs break off, the other ones in parallel can't handle the load and burn which makes them go short circuit, however the power supply section blows the fuck up before the output section can smoke properly.

My guess? Total rebuild, including output driver board, $400-500.

[AI James]

low voltage and running too small of fuses for the comps... at least get a battery back there... fuck the bullship burp box rules and try to run your amp with a 20 amp fuse... that fuse popping is a sign of a strain on the entire system, the fuse, cant pass enough power to the amp and the amp suffers... II will run 300 or 200 or none

the fuse would pop before an amp blowing

[luke perez]

what ever the problem is it suck good luck my friend

[skittlesRgood]

Too late

Honestly although the smoking part is in the power supply I would say dollars to donuts there will be a shorted out part in the output section.

Vertical mosfets + spring clips without the super duper DB-R strengthening technique means the output FETs break off, the other ones in parallel can't handle the load and burn which makes them go short circuit, however the power supply section blows the fuck up before the output section can smoke properly.

My guess? Total rebuild, including output driver board, $400-500.

i want to know more about this strengthening technique. i thought you would want the parts to be flexible.

[audiofanaticz]

My guess? Total rebuild, including output driver board, $400-500.

Thats awefuly expensive to fix a powerbass amplifier. My spl dynamic 3000s where only $300 to rebuild the powersupply @ db-r

i want to know more about this strengthening technique. i thought you would want the parts to be flexible.

Db-R solders the mosfet legs from both the bottom side and top side of the pcb to stiffen them up as much as possible.

The weak solder joints from the factory is what allows the mosfet legs to stress and break, keeping them flexible while fixing the amp will result in the same problem.

[IH8PunkRok]

wow lots of info. thank you guys for the enlightenment.

i think im gonna lay this amp to rest and try a new project