This is small stereo power amplifier circuit. By use integrated circuit number TDA2822 within be model Dual Amp give power watt at 1W + 1W bandwidth expansion rates at 40dB 120kHz use power supply since 1.8V to 15volt and use current 6mA feed power supply 9volt reach the circuit C7 will perform filter fire level smoothly then go to feed power supply give with IC1 at 2 input signal pin will on the left and right that come in to change VR1 and VR2 for fine decrease popularity level has of the sound already coupling change C1 and C2 from that time pass by reach input of IC1 at 7, 8, 6 pin and 5 respectively from that time a signal had that to enlarged then go out 1 pin way.
Which be output of the channel a signal on the left and pin 3 ways are output of the channel on the right by a signal output of left channel and right channel will change C3 and C4 signal coupling reach a loudspeaker. By have R1, C5 and R2 C6 perform eradicate the noise of each the channel goes out.
When using the power supply 9 volt into this circuit.VR1 and VR2 to adjust the signal level of the right and left, the pin 7 and pin 6 of IC1.The amplifier IC1 is out of the output pin 1 and pin 3, through the C4 and C5 coupling signals to the left and right speakers.The C6, R1 and C7, R2 is to reduce noise.
How to build this projects
This projects is simple stereo amplifier in small size PCB see in Figure 2 and you can put all parts in components layout.
Figure 2 the PCB layout and the components layput of stereo small amplifier using TDA2822
The detail components.
IC1___________TDA2822_____DUAL POWER AMPLIFIER
C1,C2_________10uF 25V____Electrolytic capacitors
C3____________100uF 25V___Electrolytic capacitors
C4,C5_________470uF 25V___Electrolytic capacitors
C6,C7_________0.1uF 63V___Polyester capacitors
B1____________3V to 9V battery
Speaker 8 ohms
TDA2822 datasheet-Dual power amplifiers
This is datasheet of TDA2822 as a dual power amplifiers in in portable radio on DIP 16pin. We can use as stereo configuration and Mono (Bridge audio amplifier).
It has clearly features as follows:
– The supply voltage down to 3V can use with AA 3V battery.
– Wide supply range 3V-16V
– Up to 2W + 2W output power(highly popular).
– Low crossover distortion
– Low quiescent current.
The typical application circuits (Bridge at 4 watts output)
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