The 20-W + 20-W Stereo Amplifier Circuit Diagram consists of two complete, separate 20-W
RMS bridge-type amplifiers. The input signal source is brought into the
amplifier through the voltage divider network, which is made up of Rl,
R2, and PI. Resistor Rl provides a load impedance between the signal
source and ground. Resistor R2 couples that signal to potentiometer
PI.The signal is coupled by capacitor CI to the noninverting (+) input
(pin 1) of internal amplifier (A) of IC1, where the signal is greatly
amplified. Capacitor C2 couples the (+) input of the other (B) internal
amplifier of IC1 to ground.
That causes the input signal, which is
referenced to ground, to be coupled to both amplifiers because both the
inputs and outputs of IC1 (A) and IC1 (B) are connected in a bridge
configuration. Notice that the output of IC1 (A) from pin 10 is
connected to one side of the speaker and the output of IC1 (B) from pin 8
is connected to the other side of the speaker.
20W Stereo Amplifier Circuit Diagram
That is why the speakers used cannot have one side connected to
ground. Resistors R6 and R7 set the gain of the amplifier. Resistors R9
and R10 and capacitors C9 and C10 provide frequency stability and
prevent oscillation. Capacitors C6 and C7 provide bootstrapping, which
prevents distortion at low frequencies. LED LI lights up by way of a
series resistor connected from the anode to +12 Vdc when power is
applied.Power for both IC1 and IC2 is brought in through D1 (to protect
amplifiers from reverse polarity). Capacitor Cll provides additional
power supply line filtering. This booster is capable of producing 20 W
RMS output out of each channel.
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