Author Topic: Its big! Car audio amplifier... (Read 42038 times)

Monkeh · « **Reply #1 on:** October 27, 2013, 07:42:08 pm »

Because it's important the people on the other side of the six lane motorway can hear your taste in music as they go past.

SeanB · « **Reply #2 on:** October 27, 2013, 07:44:22 pm »

So that is where that month's production of Lelon capacitors went..... I was wondering who bought the batch.

Should only take about a week to change them all when they die.

c4757p · « **Reply #3 on:** October 27, 2013, 07:47:55 pm »

Quote from: Monkeh on October 27, 2013, 07:42:08 pm

Because it's important the people on the other side of the six lane motorway can hear your taste in music as they go past.

The worst part is that once you've gone deaf, you don't even need to maintain a good taste in music. You might as well play an endless loop of a guy farting in your boom wagon, the bystanders are the only ones who have to hear it...

I'm not sure if I am joking or not.

SeanB · « **Reply #4 on:** October 27, 2013, 07:54:25 pm »

I did once hear a bus coming from 1km away along a busy road. I decided to wait for the next one that was not sound propelled. Back 2 rows of seats were missing, the area being one massive wall of subwoofers. I think the sound system definitely cost more than the 50 year old Leyland bus did.

tom66 · « **Reply #5 on:** October 27, 2013, 08:25:45 pm »

Those caps are 220V, 1000uF. I wonder how many times over it would kill you if you touched that bus while live.

Monkeh · « **Reply #6 on:** October 27, 2013, 08:27:06 pm »

Quote from: tom66 on October 27, 2013, 08:25:45 pm

Those caps are 220V, 1000uF. I wonder how many times over it would kill you if you touched that bus while live.

And just how much you'd deserve it.

AmmoJammo · « **Reply #7 on:** October 27, 2013, 08:29:22 pm »

+-175 volt rails

tized · « **Reply #8 on:** October 27, 2013, 08:36:28 pm »

How fast would it drain the car batteries if you forget to have the engine running?
More than just acoustic pollution to this beast...

tszaboo · « **Reply #9 on:** October 27, 2013, 08:42:14 pm »

Wow, thanks for sharing. Can we bridge them?

Clint · « **Reply #10 on:** October 27, 2013, 08:49:15 pm »

Quote from: Monkeh on October 27, 2013, 08:27:06 pm

Quote from: tom66 on October 27, 2013, 08:25:45 pm
Those caps are 220V, 1000uF. I wonder how many times over it would kill you if you touched that bus while live.

And just how much you'd deserve it.

Tongue ?

NiHaoMike · « **Reply #11 on:** October 28, 2013, 12:54:16 am »

Quote from: AmmoJammo on October 27, 2013, 08:29:22 pm

+-175 volt rails

I guess it started out as a power inverter design? If you could score one of those for cheap (perhaps one with a bad DC/DC), it should be very easy to make it into a VFD for a small air conditioner.

c4757p · « **Reply #12 on:** October 28, 2013, 01:15:15 am »

Quote from: AmmoJammo on October 27, 2013, 08:29:22 pm

+-175 volt rails

Sweet mother of god, why!?

How many watts does this thing put out? A quick back-of-the-envelope (OK, top-of-the-calculator) calculation gave somewhere between "on fire W" and "molten kW" per speaker...

AmmoJammo · « **Reply #13 on:** October 28, 2013, 02:04:47 am »

Designed and built by Zenon in Korea. Should do just under 10,000 watts per amp into 1ohm. The first pic was too amps side by side

TMM · « **Reply #14 on:** October 28, 2013, 02:22:54 am »

That's not an audio amplifier, it's a precision arc welder

AmmoJammo · « **Reply #15 on:** October 28, 2013, 02:59:26 am »

And yes you can strap two together for 20kw into 2 ohm

PedroDaGr8 · « **Reply #16 on:** October 28, 2013, 04:09:16 am »

Speaking of arc welder. I remember a guy telling me back in the 90s a few of the amplifier companies used to do just that. To show their amps were stable into fractional ohms (at over 1kW) they would actually use them as arc welders.

rexxar · « **Reply #17 on:** October 28, 2013, 04:25:42 am »

Quote from: PedroDaGr8 on October 28, 2013, 04:09:16 am

Speaking of arc welder. I remember a guy telling me back in the 90s a few of the amplifier companies used to do just that. To show their amps were stable into fractional ohms (at over 1kW) they would actually use them as arc welders.

That's insane.

poorchava · « **Reply #18 on:** October 28, 2013, 07:57:32 am »

I remember a guy on Polish electronic forums, who built a 3kW RMS (IIRC) AB-class audio amplifier. He was boiling water in a 50l bucket as a load test

Mechatrommer · « **Reply #19 on:** October 28, 2013, 08:05:43 am »

Quote from: c4757p on October 28, 2013, 01:15:15 am

Sweet mother of god...

god doesnt have a mother. where did you hear that bollock?

tom66 · « **Reply #20 on:** October 28, 2013, 08:14:44 am »

Is that 10kW continuous? I don't believe you can do 10kW with just a small cooling fan -- you'd need water cooling to do that.

"sweet mother of god" is a saying which refers to the Virgin Mary... it's a saying... don't take it too seriously.

Psi · « **Reply #21 on:** October 28, 2013, 08:24:02 am »

Quote from: tized on October 27, 2013, 08:36:28 pm

How fast would it drain the car batteries if you forget to have the engine running?
More than just acoustic pollution to this beast...

Math says 2-3min, but probably more like 30 sec due to the battery starting to melt/boil
10kw is 833A

AmmoJammo · « **Reply #22 on:** October 28, 2013, 08:32:44 am »

Battery life would depend entirely on how many batteries you have?

These amps weigh in at 28kgs, and are of course class D, so I believe they have enough heatsinking to run fairly continuously

peter.mitchell · « **Reply #23 on:** October 28, 2013, 08:34:05 am »

I am not certain but I thought on the highr power units they required a 24/36v/48v supply opposed to just 12v?
Class D huh? Looking at the filtering they look like they'd be better as an AM transmitter at 10kw then. ..

grumpydoc · « **Reply #24 on:** October 28, 2013, 08:36:31 am »

Quote

Should do just under 10,000 watts per amp into 1ohm

A few others have asked the same question - where the fuck do you get 20kW from in a car with 12V wiring and perhaps a 1kW alternator?

Unless, of course, you plan on towing one of these behind you

Edit:

Quote

I am not certain but I thought on the highr power units they required a 24/36v/48v supply opposed to just 12v?

OK, even at 48V that's over 400A without taking the amp efficiency into account.

But, see above, where do you find 20kW in a car?


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Author Topic: Its big! Car audio amplifier... (Read 42038 times)

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