A resistor and capacitor in series at the output to ensure stability at high frequencies. Heat Sink:
STK411-210E SANYO Integrated Circuits (ICs) - Jotrin Electronics
The STK411-210E is a powerful and reliable hybrid IC. With high power output, low distortion, and robust built-in protection, it offers an excellent platform for audio enthusiasts.
The STK411-210E is a testament to a bygone era of high-quality, discrete-style hybrid amplifier modules. Its ability to deliver significant power, combined with low distortion, made it a favorite for many hi-fi manufacturers.
Manages pop-noise reduction networks and system standby states. Negative Power Rail ( −VCCnegative cap V sub cap C cap C end-sub Accepts the split negative high-current DC voltage line. 12 & 13 Main Ground Reference High-current center-tap transformer grounding point. 14 & 15 Channel 1 & 2 Audio Outputs stk411-210e circuit diagram
Contains coupling capacitors to block DC and resistors to set the input impedance.
Audio signals enter Pin 1 (Left Channel) and Pin 5 (Right Channel) through high-quality non-polar or film coupling capacitors. These capacitors block dangerous DC voltages originating from preamplifier sources. Resistors linked between the output lines (Pins 14 & 15) and the feedback inputs (Pins 2 & 4) establish the overall operational voltage gain, ensuring stable frequency response spans from 2. Symmetrical Split Power Supply ( +VCCpositive cap V sub cap C cap C end-sub −VCCnegative cap V sub cap C cap C end-sub
With a Total Harmonic Distortion (THD) as low as 0.08% in similar series models, it ensures your music stays crisp even at high volumes. Breaking Down the Circuit Diagram
) is mandatory. Apply a thin, even layer of thermal silicone grease between the IC backplate and the heatsink. A resistor and capacitor in series at the
| Pin | Name | Description | |-----|----------|---------------------------------| | 1 | NF1 | Negative feedback input (Ch1) | | 2 | IN1 | Audio input (Ch1) | | 3 | GND | Signal ground | | 4 | GND | Power ground | | 5 | OUT1 | Speaker output (Ch1) | | 6 | Vcc+ | Positive supply (+21V to +25V) | | 7 | Vcc- | Negative supply (-21V to -25V) | | 8 | OUT2 | Speaker output (Ch2) | | 9 | GND | Power ground | | 10 | GND | Signal ground | | 11 | IN2 | Audio input (Ch2) | | 12 | NF2 | Negative feedback input (Ch2) |
A 10Ω resistor (typically 2W to 5W) in series with a 0.1µF film capacitor is connected from the IC output pin to power ground. This ensures stability by presenting a constant resistive load at ultrasonic frequencies, preventing oscillation.
The STK411-210E requires a split power supply. The voltage should be chosen based on the desired speaker impedance (4Ω or 8Ω). Typically ±30Vplus or minus 30 cap V ±50Vplus or minus 50 cap V
0.1µF film capacitors placed parallel to the large electrolytics to suppress high-frequency noise. 2. Input and Feedback Network The STK411-210E is a testament to a bygone
The STK411-210E is part of a larger family. For repair purposes, here are known equivalent and upgrade options:
The STK411-210E is a thick-film hybrid audio power amplifier integrated circuit (IC) manufactured by Sanyo. Renowned for its low distortion and robust output, this IC is a staple in high-fidelity stereo systems and home theater receivers. Understanding its pin configuration, application circuit, and peripheral component selection is essential for building, repairing, or upgrading audio systems utilizing this module. Technical Specifications and Features
| | Value | | :--------------------------- | :------------------------------------------ | | Type | Dual-Channel (Stereo) Class AB Power Amplifier [Hybrid IC]| | Output Power (8Ω) | 100W + 100W, THD < 0.1% | | Output Power (6Ω) | 120W + 120W, THD < 0.3% | | Supply Voltage (±VCC) | ±45V (max. ±55V) | | Frequency Response | 20Hz – 50kHz (±3dB) | | THD (Typical) | <0.1% at rated output power | | Damping Factor | >60 | | Operating Temperature | -20°C to +75°C | | Package | Single In-line Package (SIP-18) |