Tuesday, June 15, 2010

Low Pass Filter circuit

This is a Low band pass filter circuit especially designed for subwoofer loudspeaker. There are two input channels from stereo audio system, and the output was one output channel which connected to one subwoofer. Just like active speaker for computer.

Schematic Diagram:
Low Pass Filter circuit diagram

PCB Layout:
Low Pass Filter PCB layout

Component Placement:
Low Pass Filter PCB design


Visit the source page for detailed information about this low band pass circuit.

About Audio Amplifier
An audio amplifier is an electronic amplifier that amplifies low-power audio signals (signals composed primarily of frequencies between 20 - 20 000 Hz, the human range of hearing) to a level suitable for driving loudspeakers and is the final stage in a typical audio playback chain.

The preceding stages in such a chain are low power audio amplifiers which perform tasks like pre-amplification, equalization, tone control, mixing/effects, or audio sources like record players, CD players, and cassette players. Most audio amplifiers require these low-level inputs to adhere to line levels.

While the input signal to an audio amplifier may measure only a few hundred microwatts, its output may be tens, hundreds, or thousands of watts. More explanation about power audio amplifier can be found at wikipedia.org

This is a video tutorial about how to a very simple audio amplifier based on the LM386 amplifier chip. It can be built for less than $20 (or might be less than $8 in some countries) and used to amplify any low level audio signal including a guitar, bass or mp3 player.

Watch the video:

1 comment:

Anonymous said...

where is the parts list? its pretty unclear for example p2 22k what is this is it stereo pot or what?