Introduction: HI-FI 4 Channel Audio Amplifier VERY Simple and CHEAP!!!!

Picture of HI-FI 4 Channel Audio Amplifier VERY Simple and CHEAP!!!!

It's Time to Make Some nice amplifier which has nice audio quality with very low distortion and simple and quite easy to make because a circuit is very simple & very few components are required and all the pieces of stuff are easily available .

Hello, Guys, this is my fourth instructable and my previous experiences were great because of you all . And now I came with an amazing 4 channel audio amp Which sounds great .

Now without wasting more time I am going to tell you how to make one in very few steps !!!

Note:- Don't forget to Vote for my instructable thanks is advance

Step 1: Gather Components

Picture of Gather Components

First youn need to gather all the parts required for the circuit . You can buy all the components from your local elctronics shop or you can purchase complete circuit components online from here if you are from India .

  • TDA7388 IC (You can buy these in under 3$ from ebay,aliexpress etc.) X 1 Pc.
  • 470uf /50volt electrolytic capacitor X 1Pc.
  • 47uf/50volt electrolytic capacitor X 1Pc.
  • .1uf ceramic capacitor code(104) X 5Pcs.
  • 1uf ceramic capacitor code(105) X 2Pcs.
  • .47uf ceramic capacitor code(474) X 1Pc.
  • 10K resistor X 1Pc.
  • 47Kresistor X 1Pc.

Step 2: Other Stuffs

Picture of Other Stuffs

You need more stuffs more than components for this build and it can be according to your build I am giving basic list of stuffs which I have used for my build

  • Enclosure X 1Pc.
  • Knob for potentiometer X 1 or 2 Pcs.
  • 4 Rca Female Jack X 4 Pcs.
  • Led with 1K resistor X 1 Pc.
  • Stereo Female audio Jack X 1 Pc.
  • DC Barrel power jack female X 1 Pc.
  • Heat Sink X 1 Pc.
  • Perfboard X 1 Pc.
  • Aux cable X 1 Pc.

And you also need come common stuffs like soldering iron ,file,cutter ,screwdriver ,drill etc.

Step 3: Schematic OF TDA7388 AMP

Picture of Schematic OF TDA7388 AMP

Schematic is quite simple and it has very few external components I have attached 2 Schematic actually both are same and this is same as given in its datasheet .

Step 4: Lets Start by Making Circuit

Picture of Lets Start by Making Circuit

I have just attached some pictures of my build of circuit . And circuit takes very less space on PCB and Note one thing that you need to adjust legs of IC In order to align according to the holes of perf board and don`t forget to add a heatsink to your amp.

For Power supply, I`ve used my variable bench power supply to power this amp specification is 12 volt 5 amps. but you can use more powerful powers supply for getting more power and you also need much larger heatsink than mine actually it is loud enough even at 12v 3amps for a room and sound is really good .

Step 5: Test & Enclose Everything !!

Picture of Test & Enclose Everything !!

After completion of circuit you can test circuit by powering it by power supply and attaching speaker temporarily to test and after this step you can Enclose everything in enclosure of your choice you can also use wood or 3D printer for this purpose to enhance its beauty .

Step 6: Final LOOK !!!!

Picture of Final LOOK !!!!

Final loook of my amp after complete built .

Hope you all like it and feel free to ask anything or to give any suggestions . I really expect as many as possible Hits on I MADE IT BUTTON.




alejandrolleida made it! (author)2017-07-23

I made it!!! its very nice. I put it into a can and add a fan from a computer. Now it's the power amplifier for my car sound system. It's time to add a 250 uf capacitor to reduce the noise from the engine. And all under the 20€.

RajaH16 (author)2017-07-16

Hlo sir
1.Please recommend me speakers which can support this amp

2. And, can I use this at home with two speakers of 4 ohm speakers with DC

simbuvasa (author)2017-02-09

Bro where can I buy all these component through online ? I m from india and what about input ... Can i use single input 3.5 jack and get 4 output?

Filipino1122 (author)2016-11-30

Hi again, what is "IN"?

Akshay Jha (author)Filipino11222016-12-03

IN means audio input

Filipino1122 (author)2016-11-28

Hi, i have a 12v 25A power supply. It wiil be ok?

Akshay Jha (author)Filipino11222016-11-30

Yes, you can try that if you won't get too much heat from the heatsink .

kartik negandhi (author)2016-11-19

where did u buy the enclosure for it?can u tell me the shop or link to it?

Actually I baught it from indiamart from manufacturing company in hydrabad around 100pcs and I live in jaipur so they shipped that 100pcs at my doorstep but you can find as laptop enclosure on internet or if you want some I can send you for that U can give me ur contact no.

iqlogic (author)2016-11-15

Sorry, I don't like it at all. I tell you why:
1.) This is no even close to "HiFi grade" amplifier, so why this misleading title?

2.) Very small heatsink

3.) No openings => no airflow

4.) Soldering is very bad. You should watch some tutorials on YT, or here and practice, practice, practice :)

And if you interested in building amplifiers I can recommend you TDA7498 or PAM8406. Very powerful class D amps for very reasonable price :) You should try it.

Akshay Jha (author)iqlogic2016-11-15

It`s completely okay if you don`t like it but

1.) The reason I have said HIFI is because of its output quality and datasheet

2.)Yes heatsink is very small because I am not running it on its full power I am just running it with 12v 3amp and it gives negligible distortion and I found very less heat dissipation actually

3.) When I was putting this amp in that small enclosure I thought to do some holes on enclosure but when I tested It I found no reason to do that

4.) Yes might be my soldering skills are not so good .but this time I want to make it as small as possible I think that is the reason it becomes quite messy

5.) Actually, we are learners and I am DIY lover and I,ll try this just for the sake of making it and I also tried many other amps like 6283 ,4440 and Pam8403,Tda2030 and many others and I already have PAM8406 lying on my workbench

And I have never tried TDA7498 but if you are suggesting me I`ll give it a try thanks for raising such points :-)

tda7498 is amazing..I've tried it..worth the money?

AlissonD (author)2016-11-19

While it's not really Hi-Fi, it's quite cool! I was looking for an amp with so few components for a long time.

Akshay Jha (author)AlissonD2016-11-19

Thanks for comment

FroggZ (author)2016-11-16

Hey, thanks! I learned something from this.

Akshay Jha (author)FroggZ2016-11-18

Welcome :-)

iqlogic (author)knud.knudmand.72016-11-16

No, it's not...

I Don't have that much to spend on it but some day definitely I'll buy someday.............thanks for comment :-)

alejandrolleida (author)2016-11-16

I have a question. Can bridge any outputs? example for a bass speaker

boatmakertoo (author)2016-11-15

Truly amazing. You power four 40 watt amplifiers with a 24 watt power source. The energy crisis is over.

Akshay Jha (author)boatmakertoo2016-11-15

Sorry brother I have edited that

AshokK17 (author)2016-11-14

Good job.
it's so easy to make.

Akshay Jha (author)AshokK172016-11-14

Thanks bro & by the way it is cheap also so no need to invest too much on amps

toasterizer (author)Akshay Jha2016-11-15

Ii like it. How does it sound?

Akshay Jha (author)toasterizer2016-11-15

It sounds fairly nice sound .

andrewty (author)2016-11-15

Have a look at the chip dissipation when delivering power to the 4ohms loads.

The graph shows ~23W being dissipated when 1W is being delivered.

the heatsink will need to be very large to get rid of 23W if you plan to have continuous average outputs of 1W into your loads.

Look at the THD vs output graph.

the signal distortion rises rapidly as the output passes above 15W

It passes 0.1% THD when the output reaches ~18W into 4ohms when the supply has sagged to 14.4Vdc.

The Absolute maximum operating voltage is specified as 18Vdc.

Allowing for voltage sag at the supply pins makes this a quad 18W amplifier, not 40W.

rafununu (author)2016-11-14

12V 2A produces 24W.

To deliver 4x40W to the output, the power supply must be able to furnish
at least 160W. If the supply is coming from mains, it must be well
regulated and C7 couldn't be 470µF, it must be increased.
(1000µF for 1A)

Akshay Jha (author)rafununu2016-11-14

You caught me on that actually while writing instructable I have used initially that power supply but after that right now I am using 12 volt 15 amp car battery and the best part is that it is not necessary to use Exact high power supply

ac-dc (author)Akshay Jha2016-11-15

You cannot reach higher wattage without higher voltage. Amps don't mean much and by that I mean that normally there would be a larger electrolytic capacitor to get past the peaks.

There is nothing wrong with building a low power amp for a purpose, but it shouldn't be stated as higher wattage than it is. Try using 18V to 28V Vs and 5A power supply, which is in the datasheet, with a much larger heatsink on it, capable of 80W dissipation, also in the datasheet.

Even then, distortion goes through the roof at a mere 10W, also in the datasheet. Do you see a trend here? You've taken their already silly marketing info and not even followed their requirements to get THAT.

This amp would be quite fine to power speakers to a usable level, but don't expect more than about 15W from an enclosure like that unless it's class D.

petras (author)rafununu2016-11-15

Yes its 4x4 W not 4x40.But its enough loud on 4ohm speakers.On 8ohm its less then 4x2.5W.

Akshay Jha (author)petras2016-11-15

No brother its 4*40 watts you can check from its datasheet and I am sorry right now I am using car battery which is of 12v and 15 amp for powering it thanks

jesterod. (author)2016-11-15

Very nice but theres one thing that bothers me.... Yellow is for video

Akshay Jha (author)jesterod.2016-11-15

I also want to upload video of amp but my exams are going on but soon I'll upload the video

corystal (author)Akshay Jha2016-11-15

I think he means the color of the output jacks... red and yellow as opposed to red and white.

Wush (author)2016-11-12

What impedance speakers did you use? How many RMS Watts do you get?

Akshay Jha (author)Wush2016-11-14

I have used 4 ohm speakers and I have not measured Rms watts I have mentioned according to the datasheet

About This Instructable



Bio: Hello I am Tech Creator Akshay I love electronics and get in touch for more projects
More by Akshay Jha:Add Voice to Your Arduino Projects Without Using Any Module(BLINK WITH VOICE)How to Interface Oled and Arduino (Part -1)DIY Helping hand for soldering and elec.(SIMPLE & CHEAP)
Add instructable to: