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Old 18th January 2013, 06:09 AM   #1
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Default Car Audio Amplifier

Does anyone know of a good solution for a 12V car cigarette lighter powered amplifier? (either DIY or commercial)

An age old issue I've been trying to deal with is driving music through the aux jack on my 2008 BMW 328xi with my Galaxy Nexus which does not produce loud enough of audio; annoyingly the aux and 12V power jack on this car are located in the center compartment where there isn't a whole lot of space to put anything big. (most longer car plugs will prevent the compartment from being able to close) I tried using a bluetooth receiver from Griffin ( Amazon.com: Griffin Technology BlueTrip AUX for iPhone and Smartphones: Cell Phones & Accessories ) and it was perfect form factor-wise but it was even quieter than my phone and it also completely killed the bass so I returned that within a day.

The only product I've found so far that matches the overall objective is: 12 Volt Boostaroo Revolution® Audio Amplifier & Sound Enhancer
I've been trying to look around and see if there is anything I can either buy or DIY - any ideas?
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Old 18th January 2013, 11:18 AM   #2
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How about building one based on this cirquit?

LA47536
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Old 18th January 2013, 01:45 PM   #3
Bone is offline Bone  United Kingdom
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Or one of these http://www.ebay.co.uk/itm/2-X-25-Wat...item19d73a732f or http://www.ebay.co.uk/itm/YJ-TA2020-...item2ec2360c2a

Last edited by Bone; 18th January 2013 at 01:48 PM.
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Old 18th January 2013, 06:26 PM   #4
jaycee is offline jaycee  United Kingdom
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You probably dont need a power amplifier at all, just some gain on the output of your phone before you feed it into the aux input of your car's audio system.

In that case all you need is a dual opamp, which you can run quite easily off of a single 12v supply
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Old 18th January 2013, 06:56 PM   #5
jaycee is offline jaycee  United Kingdom
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A circuit arrangement like this would be sufficient. Any dual opamp would do such as a 4558, tl072 or ne5532. As shown, it would provide 2x gain (6dB). For ~3x gain (10dB) change R4 to 4K7.
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Old 18th January 2013, 07:19 PM   #6
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Yea for a DIY solution a power amp isn't needed as you only need a bit of gain for the aux jack - my visualized solution would probably be something like the following:

Power: Isolated DC-DC dual output (+/-) converter with 12V cigarette lighter input
Amp: Something like a CMOY essentially or an Objective2 with 3.5mm input and output; Voltage Gain ~5
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Old 10th February 2013, 04:09 AM   #7
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Here's what I ended up making in order to power a cMoyBB off of the car's 12V cigarette lighter receptacle.

Click the image to open in full size.

Click the image to open in full size.

I get a nice, clean, and isolated 12V to power the cMoyBB with a voltage gain of 5 which amplifies the aux input nicely.
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Old 10th February 2013, 05:51 AM   #8
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hi friend
i need a peri amp for my input amp too
can eny one help me please ?
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