20W Audio Amplifier using LM1875

  • Rajkumar Sharma
  • 38.979 Views
  • moderate
  • Tested

photo

20W Audio Amplifier kit is based on LM1875 IC.

Specifications

  • Power supply – 48 VDC
  • Output – 20 W, 4 Ω
  • Very low distortion (THD – 0.015%), good channel separation and ripple rejection
  • IC built-in thermal, short circuit protections
  • Internal output protection diodes
  • Terminal pins for connecting input
  • Power Battery Terminal (PBT) for easy power supply and speaker connection
  • Power-On LED indicator
  • Heatsink for IC
  • Four mounting holes of 3.2 mm each with nut and stud
  • PCB dimensions 48 mm x 60 mm

Schematic

schematic (1)

Parts List

parts (1)

PCB

Subscribe
Notify of
guest
8 Comments
Inline Feedbacks
View all comments
sandeep

Can this circuit works on 30 DC and give o/p up 10 to 12 W

Raju

hi,
Can this circuit works for 12VDC and gives O/P of 5W 8ohms?

Raju

Hi, Thank you for the reply,
I am new to this audio amplifier designs, can you tell me that is there any calculations for getting these values? As I was thinking to use the same circuit for making the audio amplifier.

Also, can you send me the package details of the components used in your circuits so that it will be helpful for me to choose the right components.

Raju

Hi,
Thank you,
can I get this as ready module for my internal testing?

Raju

The out loudness is very low, is there any changes I can make to increase the volume with same 12VDC single supply? Also there is noise distortions, how can I reduce it?

RELATED PROJECTS

X
Win an ADP3450 Oscilloscope