Design and Build Your Own Compact Disk Hi Fi Audio System
Budget: $30 – $250 USD
The main goal in making the CD audio amp is to take a relatively small signal from the
CD player (VS ≈ 0.5V ), with relatively high source resistance (RS ≈ 1K), and amplify it
sufficiently to drive a speaker, which is usually described as an 8Ω load. A good quality amp
will be able to deliver five to ten watts average power to the load, without distorting the
original signal. In other words, the signal supplied to the speaker (load) should be an exact
replica of the original signal coming from the CD player. Therefore, the hi-fi will amplify all
frequencies equally over the audio range which is 20Hz to 20kHz. Any unwanted deviation
from the original signal is considered distortion.
CD player (VS ≈ 0.5V ), with relatively high source resistance (RS ≈ 1K), and amplify it
sufficiently to drive a speaker, which is usually described as an 8Ω load. A good quality amp
will be able to deliver five to ten watts average power to the load, without distorting the
original signal. In other words, the signal supplied to the speaker (load) should be an exact
replica of the original signal coming from the CD player. Therefore, the hi-fi will amplify all
frequencies equally over the audio range which is 20Hz to 20kHz. Any unwanted deviation
from the original signal is considered distortion.