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
6R1, R220KΩR_0805_2012Metric2
10RV1, RV210KΩPotentiometer_Bourns_3266W_Vertical2
11J2, J3, J5Conn_01x02_MalePinHeader_1x02_P2.00mm_Vertical3

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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