Simple Audio Amplifier - 50mw

Simple , low power audio amplifier using just 3 transistors capable of about 50mw.
You can up the voltage from 9V but you will need a heatsink for the 2 final transistors.
At 9V it will take about 20mA from the battery or power supply.

 

Simple Audio Amplifier with TDA7560 4x45w

This amplifier can be used with a max 18v power supply and will deliver 4x45w on a 2 ohm speaker and 14.4v.
The amplifier will play when both stand-by and mute are connected to Vcc.

Simple Audio Amplifier with TDA7294

Tda 7294 is a audio class AB amplifier with muting/stand-by , short-circuit and thermal shutdown protections.

 TDA 7294 has a ±10 - ±40 Supply Range and at 145 celsius degrees will shutdown.
You can use a 4 ohm or a 8 ohm speaker

Simple Audio Amplifier with STK465-2x30w

Very easy to build with high power output.
The amplifier can work with 4 ohm and 8 ohm speakers .

Component list:

R1 = 1K C1 = 1uF/35V R2 = 3,3K C2 = 470pF R3 = 100 C3 = 100uF/60V R4 = 330 C4 = 100uF/60V R5 = 3,3K C5 = 10uF/60V R6 = 1K C6 = 47uF/60V

R7 = 0,33 C7 = 8,2pF R8 = 33k C8 = 0,1uF R9 = 4,7 C9 = 1uF/35V R10 = 1k C10 = 470pF R11 = 3,3k C11 = 100uF/60V R12 = 100 C12 = 100uF/60V

R13 = 330 C13 = 10uF/60V R14 = 3,3k C14 = 47uF/60V R15 = 1k C15 = 8,2pF R16 = 0,33 C16 = 0,1uF R17 = 33k R18 = 4,7 IC1 = STK465 LS1 = Speaker 40W 8 or 4 Ohm

Simple Audio Amplifier with tda2003-10w

Using a very low number of external components you can build this simple amplifier using the cheap Tda2003 who has protection against DC and AC short circuit between all pins and ground, thermal over-range, load dump voltage surge up to 40V and fortuitous open ground.
The power supply can be between 8v and 18v making this amplifier a very usefull testing kit or general use in simple setups.

You can use Cx=0.039uF and Rx=39ohm , below is example of simple pcb

Vi is the signal input, +Vs is the positive power supply connector and the speaker will be connected between RL and ground

Simple Audio Amplifier with tda2006-12w

This audio amplifier is build around the tda2006 integrated circuit who features a short circuit protection system, and a thermal shutdown system in case of overheating.
With a 12v power supply the circuit delivers 12w on a 4 ohm speaker and 8w on a 8 ohm speaker.
The integrated circuit can work with a power supply between 6v and 15v max.