Simple PAM8403 Amplifier Circuit

3W Class D Audio Amplifier designed by using IC PAM8403, This IC is a filterless 3W Class D stereo Audio Amplifier, with few easily available external components Simple PAM8403 Amplifier Circuit designed.




IC PAM8403 Offers low THD+N allowing it to achieve high quality sound reproduction. This IC can directly drive Output Speakers. It can give 3W output with 4Ω Loud Speaker and 5V Power Supply and also provides efficiency upto 90%.

Circuit Diagram

Components Required (BOM)

1C1, C20.47µFC_0805_2012Metric2
2C30.1µFC_0805_2012Metric1
3C410µFC_0805_2012Metric1
4C5100µFC_0805_2012Metric1
5C61µFC_0805_2012Metric1
6R1, R220KΩR_0805_2012Metric2
7R310ΩR_0805_2012Metric1
8R4R_0805_2012Metric1
9U1PAM8403SO-16_3.9×9.9mm_P1.27mm1
10RV1, RV210KΩPotentiometer_Bourns_3266W_Vertical2
11J2, J3, J5Conn_01x02_MalePinHeader_1x02_P2.00mm_Vertical3
12J1Conn_01x04_MalePinHeader_1x04_P2.00mm_Vertical1
13J4Conn_01x05_MalePinHeader_1x05_P2.00mm_Vertical1

Construction & Working

IC PAM8403 comes in SOP-16 Package hence it occupies minimum PCB space, Analog VDD and Power VDD supply applied from J4 Connector. Power GND and Analog GND also applied from J4 Connector, Mute and SHND (Shutdown) Pins are Active low pins when applying GND supply to these pins we can mute and shutdown the PAM8403 from its operation.

Connector J1 acts as a Audio Input terminal, here stereo input Right and left channel audio signals from source connected, then to the IC through variable Resistor and Capacitor filter. Output Audio signal for Right loud speaker connected in J2 and output signal for Left loud speaker connected in J3 connector. By varying the RV1, RV2 variable Resistors we can control the output volume in loud speaker.

Printed Circuit Board

Simple PAM8403 Amplifier Circuit PCB Gerber Files.

Interactive Board Viewer

     




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