Stk413-430 Circuit Diagram !!link!! May 2026

| Symptom | Likely Cause | Circuit Area to Inspect | |---------|--------------|--------------------------| | One channel dead | Open R5 (0.22Ω) or broken trace | Output emitter network | | Distorted sound | Failed NF capacitor (Pin6/Pin11) | Ripple filter circuit | | Hum/buzz in both channels | Open ground connection or main filter caps dried | Pins 3,7,10; main power supply | | IC runs extremely hot | Oscillation from missing Zobel network | Check C3, R6 (Zobel) near output | | Blown fuse / shorted output | Shorted output transistor inside STK | Replace IC |

Introduction The STK413-430 is a hybrid thick-film integrated circuit (Hybrid IC) manufactured primarily by Sanyo (now part of ON Semiconductor). It belongs to the renowned STK-400 series, which are class AB audio power amplifier modules designed for high-fidelity stereo applications. These modules were ubiquitous in home stereo receivers, cassette decks, and active loudspeaker systems throughout the 1980s and 1990s. stk413-430 circuit diagram

[Input L] ----|| C1 ---- Pin8 | R2 | GND Pin5 -- R3 -- GND Pin5 -- R4 -- Pin2 (OUT L) Pin2 -- L1 -- R6 -- C3 -- GND Speaker (+) ------- R5 --- L1 --- Pin2 Speaker (-) ---------------- GND Power Supply: AC 22V-0-22V --> Bridge --> +VCC (Pin1,15) / GND / -VCC (Pin4,13) 4700µF each rail + 0.1µF bypass. | Symptom | Likely Cause | Circuit Area

Unlike discrete transistor amplifiers, the STK series packs the entire output stage, predriver, and protection diodes into a single multi-pin package. For technicians, hobbyists, and audio restorers, understanding the is essential for repair, replacement, or building a custom audio system. [Input L] ----|| C1 ---- Pin8 | R2

Always verify the marking: STK413-430 has “-430” suffix indicating the specific power variant. If you are constructing a DIY amplifier based on the STK413-430 circuit diagram, follow this simplified schematic in text form: