DIY 100 Watt Audio Amplifier

About: Hi my name is Steve and i'm a Creative and I got Technical skills i can build anything just stick to my account . I'm a YouTuber so you also can see my all videos here https://www.youtube.com/SteveWillsonKujur

Hey! everyone My name is Steve.

Today I'm going to show you How to Make 100 Watt Portable Amplifier in a Very Simple Way

Click Here to See The Video

Let's Start

Step 1: Features

Output Power

  • 100 Watt x 1 @ 4Ohms

Input Power

  • 16 - 35V DC

Built-in Protection

  • VERY HIGH OPERATING VOLTAGE RANGE (±40V)
  • DMOS POWER STAGE HIGH OUTPUT POWER (UP TO 100W MUSIC POWER)
  • MUTING/STAND-BY FUNCTIONS
  • NO SWITCH ON/OFF NOISE
  • NO BOUCHEROT CELLS
  • VERY LOW DISTORTION
  • VERY LOW NOISE
  • SHORT CIRCUIT PROTECTION
  • THERMAL SHUTDOWN

Step 2: Thing I've Used

Step 3: Circuit Diagram

You can see the circuit diagram to make it easier

Step 4: TDA7294

DESCRIPTION ABOUT TDA7492

The TDA7294 is a monolithic integrated circuit in Multiwatt15 package, intended for use as audio class AB amplifier in Hi-Fi field applications (Home Stereo, self powered loudspeakers, Topclass TV). Thanks to the wide voltage range and to the high out current capability it is able to supply the highest power into both 4Ω and 8Ω loads even in presence of poor supply regulation, with high Supply Voltage Rejection. The built in muting function with turn on delay simplifies the remote operation avoiding switching on-off noises.

Step 5: Sponsor

Today's Article is Sponsored by lcsc.com

They are the Largest Electronics Components Supplier From China Ready to Ship within 4 Hours and they ship World Wide

Step 6: PCB Board Designing

I Used EasyEDA To Create my PCB Using the Circuit Diagram Provided by STMicroelectronics and it took me about 2 Hours to Design

You can see I've used XT30 for Speaker output for easy plug and play

and for power input, I've used 3 Bullet connectors

You can Download the Gerber Files

Gerber & Circuit Diagram - http://bit.ly/2VnGGSU

Step 7: Ordering the PCB

Nowa Days it has been very easy to order PCBs and it doesn't cost you much, Yeah you easily do this in a Perf Board but the PCB Looks way better then Perf Board and Very Safe to Work So You can Put little work and money to get Professional Results

For This Project, I've used ALLPCB Service for Manufacturing my PCB and it took about 24 Hours to Manufacture my PCBs and within 7 Days they Delivered it to my door Steps

And the Quality is Just Amazing

Step 8: Soldering

I gathered all the components and soldered all the Resistances first, and then Soldered the Capacitors According to the Circuit Diagram and used a Cutter to cut all the extra legs

And then I've Soldered the Main Ic TDA7294

After That, I've Soldered the 3.5mm Bullet Connectors And XT30 Connector and it took me about 30 minutes

Step 9: Heat Dissipation

I've used a Decent Size Heat Shink for Heat Dissipation it is very necessary to use a Heat Shink Otherwise You'll burn the Chip

And it is very important to use a good quality thermal compound for better heat flow

I applied a little quantity fo thermal compound to TDA7294 IC and tighten it up with heatsink

Step 10: Stands Off

After the heatsink, I used 4 stands off to give it some clearance

Step 11: Power Supply

I used 2 SMPS each 24V @ 6 Amps giving a total of 48V @ 6 Amps

The SMPS is Connected in Series " It's Called Daul Power Supply "

+24 0 -24 V

You can also use a Transformer Based Power Supply no issues with that

Step 12: Setup and Enjoy

First I've connected the Speakers with XT30 Connector

Second I've connected the 3 Power Supply Cable via Bullet Connector

  • Red - Positive
  • Green - Ground
  • Black - Negative

Third I've connected the Audio Input cable and connected it to an Audio source

Click Here to See The Video

You Just Made It
Thank you for visiting my Instructables Stay tuned for next Projects

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    Discussions

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    романс14

    15 days ago on Step 12

    Здравствуйте! На этих микросхемах я делал усилитель ( http://ldsound.ru/usilitel-mf1-na-tda729x-73-vt4-i-8-om/ . Но с Вами в некоторых моментах категорически не согласен .
    1. 100 ватт- это при 29 вольтах на 4 Омах, но THD 10 (!)% !!!!!
    2. Площадь радиатора должна быть не менее 600 см.кв.
    3. Вы используете радиатор с очень частыми ребрами. радиатору необходим
    обдув.
    Успехов.