Posted by Circuits Arena on Monday, 17 November 2014
Low Noise Power Amplifier Circuit for subwoofer is the artlcle explaining This circuit recommended audio systems of cars and home theater technology for low noise and high base requirements Circuits Diagram ...
This circuit recommended audio systems of cars and home theater technology for low noise and high base requirements
Circuits Diagram
Figure shows the circuit diagram of sub-woofer
The power amplifier used is an integrated
class-B output amplifier. It contains 4×12W single-ended (SE) or
2×24W bridge-tied load (BTL) amplifiers. The output speaker is connected
in BTL configuration in this system for better quality.
The above circuit components are same as given in circuit diagram of power amplifier circuit and ratings also same. Low-noise JFET-input operational
amplifiers TL072 (IC1), car radio power amplifier TDA8561Q (IC2) and
transistors BC547 (T1 and T2). IC2 has two 24W BTL output channels, one
of which is connected to loudspeaker LS1. BTL is an output configuration
for audio amplifiers, a form of impedance bridging where two channels
of a stereo amplifier are fed the same audio signal.
Audio from both the channels is mixed
after level control. After mixing, the signals are fed to the buffer
stage implemented with op-amp A1 of IC1 and the output phase can be
reversed using switch S1A and S1B. This control can be useful to allow
the subwoofer to be in phase with the loudspeakers of the existing car
radio.
