PC sound cards with multiple line outputs are commonplace than left and right channel for classical stereo reproduction. The described TDA2040 amplifier is designed especially for sound cards with four 2 + 1 + 1 output channels even those...Electronics Projects, 4 Channel Amplifier For Sound Card TDA2040 "audio amplifier circuits, ic amplifier, " Date 2020/04/02
PC sound cards with multiple line outputs are commonplace than left and right channel for classical stereo reproduction. The described TDA2040 amplifier is designed especially for sound cards with four 2 + 1 + 1 output channels even those who have only a standard stereo signal, the amplifier described is complemented by simple custom ones circuits for creating additional channels.
Of course, the use of an TDA2040 amplifier is not limited to PC sound card, source signal can be any device consumer electronics with stereo nf analog output (tape recorder, player CDs and minidiscs, etc.). Only one The condition is to keep the output effective level The nf signal was about 0.7 to 1 volt, which is common for these types of devices. At higher level could easily be overexcited amplifier circuits, at a significantly lower level on the contrary, an amplifier would not be possible power up and play seemingly too quiet.
Three-channel reproduction with common the low frequency channel is based to the knowledge that human hearing can only to locate resources spatially higher frequencies. Therefore, it is enough to left and right channel send only these frequencies, the low frequencies are then transmitted in the same way together for both left and right channel. Common volume level acoustic signals (music, speech) it is not uniform throughout the spectrum decreases to higher frequencies. Therefore, most of the sound power is radiated just a common deep subwoofer and performance separated left and right “left” / “right” satellites can be significantly lower.
TDA2040 4 Channel Amplifier Circuit Schematic
This system, also referred to as 2 + 1, is often accompanied by a third satellite Centered between left and right satellites. His the task is to increase the resolution of directional localization signal for the listener. Resultant the four-channel transmission is then designated as type 2 + 1 + 1 . Six-channel is increasingly appearing system that arises from the previous one after adding two more satellites for the left and right channels. These but satellites are with respect to the listener placed from behind – that is for the listener created the perfect perception that simulates the size of the listening space Apparent movement of the source of the signal from the front backwards etc. The downside of the six-channel transmission is that it requires special recording source signals, that is also multi-channel or specially coded.
Amplifier realization The basic requirement was to create very TDA2040 cheap but relatively good quality amplifier for home use with sufficient performance with the simplest design. A variant was chosen for implementation four channel amplifier with one common channel “Subwoofer” and three “left”, “right” satellites and “centers”. The amplifier can work in two modes:
a) “Effect” when processing signals only from two independent inputs (left and right) and using internal circuits to create them required four output channels
(b) “Direct” when it amplifies signals from four independent inputs without any of them further adjustments.