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Old 1st November 2006, 11:39 AM   #1
dhole is offline dhole  United Kingdom
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Default Simple 12v mono power amp for bass driver

Ello all

Im looking to build a mono power amp to power a subwoofer for my car .This being a diy forum there seems to be very little in the way of such things. Can anyone advise on an amp ? circuits etc ? Would have thought there would be.
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Old 1st November 2006, 11:45 AM   #2
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You need a switched mode power supply to get the necessary voltage rails, then any normal typical amp that can run 4 ohms will do.
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Old 1st November 2006, 03:46 PM   #3
sreten is offline sreten  United Kingdom
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generally car audio fans are not keen on complexity and
expensive building costs just for the sake of DIY.

Car amplifiers are complex due to the power supplies for high power.
A simple bridged circuit maxes out at 20W into 4 ohms, after that
you need switched supplies.

Take something like this :

Click the image to open in full size.

The casework would cost you near 40 before you've even started.

or this :

Click the image to open in full size.

25 !

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Old 7th November 2006, 08:29 AM   #4
dangus is offline dangus  Canada
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If you could score a broken car amp that still has a good power supply section, you could build your own power amp stage for it.

Or, you might come across an amp that just needs some basic repair like a busted volume control pot. (Like the 230 watt RMS mono Kenwood that I got at a flea market)
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Old 13th November 2006, 02:27 AM   #5
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There's one right here:

That's a supply; then, just hook up whichever amp you want. It's a tricky supply, though; better would be a microcontroller-based PWM supply using an H-bridge FET configuration... if you can get the output filters right.

I built that project 89 supply, though I haven't put much of a load on it to test it out. It's a little uneven from rail to rail, which makes me worry I wound the tranny with an extra coil on one rail. It is doable, though.
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