The STK435, with its 15-pin configuration, requires only a few external components, such as electrolytic and ceramic capacitors and resistors. With a 12V DC power supply, the amplifier delivers approximately 7 watts to an 8-ohm speaker, offering excellent audio quality. The author’s prototype is shown in Fig. 1.
Circuit and working
The circuit diagram of the STK435based stereo amplifier is shown in Fig. 2. The design includes the STK IC, resistors, and capacitors, with two audio inputs and corresponding amplified outputs for the right and left channels.
Start by completing the connections for the first amplifier section of IC1, referred to as IC1A. Pin 1 connects to two resistors (R2 and R3) in series, followed by a 100-ohm resistor (R5) leading to the +12V supply. A 10µF, 25V electrolytic capacitor (C3) is connected between the junction of R2 and R3 and the ground. A 0.47µF, 25V electrolytic capacitor (C2) connects to pin 1 of IC1, with its negative terminal linked to a 1-kilo-ohm resistor (R1). Additionally, a 470pF ceramic capacitor (C1) connects the negative terminal of C2 to ground.
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