Pocket 10 Watt Amplifier




About: Lets learn together !!!

OK , Hi all ..
This my First Project in Instructables ^_^
I am from Indonesia , Here was held 26th SEA Games 2011... GO Indonesia !!!


Ok check this out ,
This is 10 watt amplifier and LoudSpeaker,
Let me tell you how I make this thing

Part List :
# acrylic
# Loudspeaker
# Some Wire
# 9Volt battery Connection 
# Unbalance Jack Female
# Power Jack Female
# Potensiometer
# Capacitor ( 2.2uF ; 470uF ; 100uF ; 0.1uF ; 1000uF )
# Resistor ( 220R ; 2.2R ; 1R )
# IC Tda2003
# Heatsink

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Step 1: Build Loudspeaker Box

Tools I use :
# Saw 
# Drill machine
# Melting Glue

I think the result is not bad , 
Ok its bad but not really , LOL

Step 2: Core Part - Tda2003

The TDA2003 is a cheap amplifier that is designed to run on single rail power supplies. It has many applications (including in car systems if you do not need to show off down the high street with your subwoofers!) and is protected against short circuits in almost every way you would think them possible.

Step 3: The Circuit

This amplifier is based on the typical application in the ST Microelectronics datasheet. The performance from this circuit is very satisfactory. The sheet contains data for typical noise and distortion statistics, I cannot confirm these statistics because I don't have the equipment, but my ears tell me that the sound is good and with sensitive speakers, this amp will show some power.

Resistor are recommended as 1% metal film, but as the picture of my prototype shows below, 5% resistors are capable (the cream coloured ones), except for the critical Rx resistor, which should be 1%. R2 and R3 are low value resistors and (unlike me) you should try and get close tolerance resistors for these. Capacitors should be electrolytic above 1uF and rated at 25V minimum. They must all be connected the right way round or failure and possibly injury will follow when the amp is powered up.

Rx and Cx must be worked out using the data sheets mathematical calculations. If in doubt however, I used 39 ohm for Rx and 33nF for Cx. Other non-electrolytic capacitors can be any type available. I used polyester layer capacitors because they have a closer tolerance (i.e. 5%) than most other capacitors.

A heatsink is important. The one shown in my prototype is actually too small and you should obtain something bigger for improved operation (unless your working with small voltages).

source : http://www.e-dan.co.uk/electronics/TDA2003.html

Here is the Design and Layout I use

Step 4: Build the Circuit Part I

tools I use :
# Acetone
# saw
# FeritCloride
# mini drill

For the Layout :
I think you can make better than me according to your needs ^_^
but if necessary I will upload it

Step 5: Build the Circuit Part II

Place all components on the circuit 

Tools I use :
# Solder Iron
# Tin
# Helping Hand Soldering ( I make this myself )
# Melting Glue

Step 6: Place Whole Circuit to Box

Hole on the box for :
# for Loudspeaker (output)
# for 9 Volt Battery (input)
# for Unbalance Jack Audio (Input)
# for Potensiometer (volume control)
# for 12 Volt from Power Jack (input)

Tools I use :
# saw
# Melting Glue
# Drill Machine

Step 7: Finally Done ^_^

okay just stay together all parts !!!

this amplifier use two way power :
1. 9volt connection for 9volt baterry ( low Quality Output )
2. Power Jack for 12 volt - 18 volt input ( for better Quality Output )

OK , hopefully this can inspire you 

Thank You

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    83 Discussions


    Question 11 months ago on Step 4

    where pcb can be available


    3 years ago

    Hello and thx!

    I am new to electronics yet i managed to build this amp and its working properly.
    I must say thought that your schematics are totaly different values than the ones you used (showed in the pictures). Some values are not shown at all some other are misplaced. For example C2 = 1000uf (taken from your images). In the schematics thought you mention C2 as 470uf.

    and Goes on.

    C1 is 470uf and in schematics you say it is 2.2uf.

    Please correct the numbers in schematics so we all know what you really did here.

    Thanks alot for your project it was nice!


    4 years ago

    hi,i wanted to know how a 2.1channel system produce 5000watts using tda2030.The subwoofer box is ported plus sealed.There are two satelite speakers,-12,0,+12 transformer and jrc4558 ic.


    4 years ago

    can i use a 4 ohm speaker?


    4 years ago

    Hmm not bad it worked (high five to you sir .


    5 years ago on Introduction

    Very nice instructable. i only have 1 point of improvement. namely the Cx.

    Cx's role is that of a high-pass filter. High-frequency goes trough it to the inverted input of the amp resulting in Treble-Treble=nothing kind of effect (upper frequency limit). 33nf is ok for high-frequency AC testing, but with audio the filter is far too small letting even noise trough and giving the high pitched sounds a almost shriekish sharp end as you become unable to hear it. instead you would want to limit the frequency to be near hearing so it rolls off the treble giving a far greater sounding sound (and little to no noise!)

    I myself have settled to using a tiny 4.7uf cap (Positive towards the amp output). It cuts of the frequency just below hearing limit and removes almost all noise i had before. it upgraded my amp from sounding nice to sounding like a classic HiFi speaker.

    I big thing i always keep reminding people of is to experiment with these kind of circuits. try different cap vallues and such. oh and if able use metal-film resistors. they do a far greater work then then the generic brown resistors and aren't costly at all.


    5 years ago on Introduction

    making circuit on proto board. um where does the pot go in the circuit, not noted in diagram

    1 reply

    Reply 5 years ago on Introduction

    Ah the potmeter is the Volume control. idea is that 1 connection is to the audio source. the other to ground and the wiper (middle) to the Input of the diagram.

    Oh if feeling adventurous play around with the vallue of Cx once you got it working. You can alter the audio quality quite effectively trough it as the one used by most isnt exactly the best. i prefer replacing it with a 10uf cap.

    Hope this helps.


    5 years ago

    gan sorry itu diskema nya letak potentio meter nya gk ada potentio meternya ditaruh di output atau input thank gan cuma itu aja bagus karyanya

    2 replies

    Reply 5 years ago

    hi bro, for the potensio you can add it at the input of the IC..


    Reply 5 years ago

    thank bro and good and nice job


    Reply 5 years ago

    each ICs have different how to use them, to make sure it, you must see the datasheet and make some experiments


    Reply 6 years ago on Introduction

    Ooopsss , I am sorry, man ....
    j9 is for output (loudspeaker)

    j6 is for power input , it has 2 ways : 9v batery (using 9v connector) and adaptor ( using Female jack connector) . They are paralel .


    Reply 6 years ago on Introduction

    j7 for input audio
    j6 for input batery 9 volt
    j9 for input 9 - 18 volt

    Here is it , hope can help you :
    The Layout :

    The Schematic :

    The 3D :