DIY 100 Watt Audio Amplifier

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

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

Thing I've Used

LCSC

Banggood

24V SMPS - https://bit.ly/2DXQ5Yq
Soldering Iron - https://bit.ly/2DXQ5Yq
Flexible Arms - https://bit.ly/2DXQ5Yq

Amazon

24V SMPS - https://amzn.to/2BvUejG
Soldering Iron - https://amzn.to/2BvUejG
Flexible Arms - https://amzn.to/2BvUejG

Aliexpress

24V SMPS - http://bit.ly/2Vva3P9
Soldering Iron - http://bit.ly/2Vva3P9
Flexible Arms - http://bit.ly/2Vva3P9

Circuit Diagram

You can see the circuit diagram to make it easier

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.

Sponsor

Today's Article is Sponsored by lcsc.com

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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

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

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

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

Stands Off

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

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

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
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