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Old 11th September 2005, 12:50 AM   #1
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Default The Most Powerful Single Supply Amp??

I'm looking to make a nice sound boost to my car audio system but I need to know a good amp choice to do it with. I'm only using a single supply by using a 120w DC-DC converter to up my car battery to 24v. So I will only have one positive voltage. I've been working with the LM4752 which is a very nice single supply stereo amp but it only outputs 11w per channel and I'm hoping to get at least double that. I tried hooking up the LM1875 in Single Supply but it only gave me about 9w max. Can anyone recommend a good powerful single supply amp?

-Segasonicfan
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Old 11th September 2005, 02:23 AM   #2
Tim__x is offline Tim__x  Canada
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How much power are you looking for, and into what impedance?

The most you'll get out of a single 24v supply without bridging is around

6W into 8Ohms
12W into 4Ohms or
24W into 2Ohms

Assuming an amp with around 2.2v of rail loss.
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Old 11th September 2005, 02:27 AM   #3
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I'm using 4ohms and I'm looking for the most power I can get (25w+). 12w is really lame I guess my best bet is to just bridge the LM4752 :/

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Old 11th September 2005, 05:09 AM   #4
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look at the data sheet of TDA7386, its says 40wattx4 at 13.2, i ve used this chip and it is really good
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Old 11th September 2005, 05:52 AM   #5
DcibeL is offline DcibeL  Canada
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I believe you are incorrect, abidr. Looking at the datasheet, on the very first page it is stated:

4 x 24W/4W @13.2V, 1KHz, 10% THD

A very poor rating, so looking further down the datasheet, to page 3 it is stated that at 13.2V you have a typical output power available of 18W at 13.2V with 0.8%THD measured at 1kHz. On page 6 there are a couple graphs of distortion measured at 14.4V supply. Quite poor quality if you ask me, but I guess it's what to be expected of a car cdplayer amplifier chip.
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Old 11th September 2005, 06:04 AM   #6
BWRX is offline BWRX  United States
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if you aren't afraid of class d amps then have a look at this:
http://www.41hz.com/Forums/topic.asp?TOPIC_ID=129
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Old 5th October 2005, 04:25 AM   #7
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Why don't you use Philips IC TDA1562Q, which works on 14V supply voltage and gives about 70W of power, because, it's a class-H amplifier. Simple schematic ;-)
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Old 5th October 2005, 11:59 AM   #8
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tda1562 can pump in the rated max for only few secs depending on the power caps that u use at its power rails.
i have a four channel amp driving six speakers in my car(4 ohm each).
tda1554q is great.22w/channel,2channels and very simple to make.works of +12v!!
tda8563 can drive down to 2 ohms with 40w/channels,2 channels,very very simple to build.it drives 4 speakers in car.runs off +12v!!
so both can be connectecd directly to car batteries.so total power at disposal for me is 120w rms.
so use of these highly recomended(people ask me bout good quality system in my car!).whats more,i use my sony discman as i/p for both without any preamp and the i/p is sufficient for the amp.
both ics stereo
so choice with u
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Old 5th October 2005, 12:03 PM   #9
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oh!i forgot.try tda7560 and another one named similarly,might be 7563.the rated power o/p is good.both for car and run from car battery i havent used them bec very costly from my source of semiconductors.
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Old 5th October 2005, 06:06 PM   #10
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tda8563 is quite nice, I have also used it in a amp. Phillips have discontinued the TDA1554, TDA1553 and the TDA1558. Try the TA8210, I think Toshiba makes them, they also have a higher power version both of them work from 13.3v, they are also quite common in some small car amplifiers and don't sound too bad either...
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