DIY 4×22W car audio amplifier based on TDA7384
So this time I decided to make pretty simple but powerful enough audio amplifier. For this I’ve chosen quad bridge car audio amplifier TDA7384 which has four input and four output channels with power capability 4×35W(4Ω).
If connect to car battery where operating voltage is about 13.2V, then each channel can give 22W(4Ω) – what is more than enough for me. This amplifier I probably will use to test audio processor TDA7313 which is stil in development phase. I didn’t find much information about this chip on the internet so I decided to built it and try on my own.
As datasheets of TDA7384 says it is low distortion, low output noise, low external component count. Also has Stand-By function and Mute function. It has several protections like from output short circuit to GND or to Vs, capable to handle very inductive loads, thermal limiter, load dump voltage. TDA7384 is an AB power amplifier cased in flexiwatt25 (eagle library is included in project archive) package wich is designed for high end car radio applications. It allows rail to rail output voltage swing with no need of boot-strap capacitors.
(click to enlarge)
I have followed the schematic in datasheed when building circuit. In datasheet you may also find PCB layout but it is two layered and didn’t fit to may box I’ve chosen. So I have made single sided PCB 50X100mm.
As I put pins on PCB for ST-BY and Mute but I not using them, I connected these pins to VCC like it is shown in PCB view. According to datasheet St-By and Mute turns off amplifier if signal in input is lower than 3.5V. So it is recommended to connect these pins to Vcc if not used.
Maximum power dissipation of chip is 80W(Tcase=70ºC), so it can handle 4 channels working at power of 20W each. But of course chip in a box doesn’t have good ventilation so I’ve put a radiator to ensure that amplifier effectively dissipates heats. I didn’t try to load amplifier to maximum to se if it doesn’t heat up to much. But at normal sound level it stays warm what is normal.
Dont forget to put thermal paste between chip and radiator to ensure lower thermal resistance. And here we go – brand new power amplifier ready to go:
When I will try it more I will write comments on it.
Project files are here: TDA7384 Eagle Files.
Thoughts Aside
When you get a car audio amplifier, you could get great cell phone deals. Almost all cell phones can be charged with a car charger. The way digital cameras need to be charged or their battery needs to be replaced. With all the hassle, wireless technology like wireless speakers, wireless keyboards and mouse are much more user-friendly.
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May 9th, 2007 at 5:10 am
Hi,
Great project, I am in need of a simple 10 - 20 watt amplifier for a small mono digital recorder. I want the output to drive a regular stereo speaker. It also needs to run off of 12VDC - 15VDC and less than 2 AMPS if possible. I am a beginner but am having fun learning, I bought DIPTrace, to learnhow to make my own circuit boards.
Where did you get that heat sink?
Really great job!
May 9th, 2007 at 9:45 am
If you don’t need four separate channels, then I recommend to use simpler chip like TDA8560Q or less powerful stereo amplifier.
I have bought raw heat-sink at local market place and cut off a part. If you are not going to drive at near maximum power, then you don’t need big heat-sink, as chip can handle up to 80W without it. But of course there should be air circulation and so on. so it is better to use one.
I had a chance to connect this amplifier to a car audio. I can say that sound is pretty clean, and powerful, but not enough for a good acoustic system. There could be more low frequencies in my opinion. But again, this is low budget amplifier. If you need more quality and power better try something different.
May 22nd, 2007 at 5:52 pm
Hi, I am thinking to use something like that pcb amplifier into a car audio system.
I need to be as small as possible and I would like to get the same quality and power of any car radio unit without extra amplifier and to be used with the car standar audio system. Could quality and power be increased using a different audio processor? Thanks.
September 11th, 2007 at 11:24 pm
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January 14th, 2008 at 1:26 am
Nice project. Planning to add it to my car as part of its restoration process. A few questions please. Can the amp channels be bridged from 4 to 2 in order to increase it power output?
tanx…
January 14th, 2008 at 11:40 pm
Lovely circuit. Worked perfectly on the first try. Thoug its not as loud as I would have loved and I’m still open to suggestions on how its poer could be increased. Any Ideas?
February 19th, 2008 at 11:33 pm
—Lovely circuit. Worked perfectly on the first try. —Thoug its not as loud as I would have loved and —I’m still open to suggestions on how its poer —could be increased. Any Ideas?
Replace the chip with the 7386 to get more wattage, be sure to read the data sheet to make appropriate changes. A higher yield approach would be to get more efficient speakers. Every 3db in efficiency is like doubling amplifier power.