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Old 2nd October 2012, 07:06 AM   #1
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Default looking to build a car audio amplifier?

I am wondering if there are some blueprints or a schematic of some kind or something
for making a simple mono car audio subwoofer amplifier
like at least a 25-50 watt amplifier to power some cheap subwoofers
something that's similar to a car subwoofer amplifier or a monoblock amp
I want to have very low noise level on the output to my subwoofers and speakers so that it doesn't sound staticy when im not playing any music.
I also want to be able to build it really easily and quickly with less than 50 parts
and since bigger parts are easier to put together.
is there something like this that's easy to build when i have the right parts to build it?
something that can fit on a breadboard from radio shack?
I've searched online but there's nothing that's close to what I want to make.
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Old 2nd October 2012, 07:16 AM   #2
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well.... there are lots of other sections that have a bunch of threads on this site, not just home amps. i believe there is a good one mentioned in the "favorite threads" sticky. search the site some. then again, someone here may just post up a simple schematic. "50 parts" might be a little hard for good sq. then again, if you are going to run it from 12v, then you could probably get away without a power supply. i have a bunch of little kicker amps that do 100w@1ohm, 50@2, and 25@4. no power supply, and run at 11.5v regulated rails, iirc.
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Old 2nd October 2012, 07:25 AM   #3
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also I am wanting to power a 4ohm subwoofer with this amplifier so you know what kind of speakers i am powering so you know what type of amplifier that I would want to build
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Old 2nd October 2012, 08:01 AM   #4
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With your 50-parts requirement, I'd think a chip amp is the way to go. Have a look around for bridged outputs that can handle that 4 ohm load running at 12 volts. That will provide the power you desire. And it will easily fit the approx. 4"x6" proto board that RS sells (or did last time I was there). The heatsink will be the largest expense.
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Old 2nd October 2012, 03:58 PM   #5
maylar is offline maylar  United States
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The most power you can get into 4 ohms from a 12V source (14V with engine running) is about 50 watts peak (16-22 wrms depending on distortion). That's what a typical car radio has per channel. If that's enough for you, check the Chip Amps forum for ideas.

Beyond that you would need to build a DC-DC converter power supply to boost the voltage up, and the level of complexity rises considerably.
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Old 2nd October 2012, 11:54 PM   #6
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i have a bunch of transistors that I could use so I was hoping I could make a good amplifier that uses transistors and a bunch of resistors and capacitors. some more simple stuff like that. and without any LM chips because I don't have any that I could use.
also I want my amplifier to make lots of bass and lots of powerful low frequencies to power a large subwoofer
and with minimal distortion if possible.
and how would I build a dc to dc converter power supply? is there a simple schematic or something I could check out?
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Old 3rd October 2012, 12:32 AM   #7
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It's virtually impossible to build a simple, high power, low distortion discrete power amplifier from random parts. Each stage has to be designed to drive the next stage. The output of the amplifier has to be monitored and fed back into the input stage to limit distortion. All of this has to be designed to be stable (resistant to oscillation) regardless of the load on the amp.

There are simple DC-DC converters but if you want to build an amplifier, you should use a salvage amplifier's power supply to drive the amplifier that you build. After you have your amplifier working properly, then you can move onto building a power supply.

Page 109 of my car audio site and the sticky at the top of the main page for this car audio forum both have information about building power supplies. The ESP site (google) also has power supply information as well as circuit boards to build amplifiers.
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Old 3rd October 2012, 12:44 AM   #8
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Take a look at the Class-D chips from Texas Instruments -- you can, in fact, squeeze blood from a turnip.
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Old 3rd October 2012, 04:31 AM   #9
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okay let's say I made my amplifier... but when I try to remove the DC going to the speakers (from a simple transistor amplifier)
every time I try to use a capacitor it just makes the sound extremely quiet and no output at all... how would I work around this?
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Old 3rd October 2012, 04:34 AM   #10
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When you use a split power supply (positive and negative supply voltage, instead of only positive voltage (12v and ground)), the amp is biased to 0v and there is no reason to have DC on the output unless the amplifier is defective or improperly designed.
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