Stk411-210e - Circuit Diagram
This is a specific request, as the STK411-210E is a hybrid thick-film IC from Sanyo (now ON Semiconductor), used in stereo audio amplifier modules, typically rated around 15W to 20W per channel (into 8Ω). A “solid paper” in an engineering context means a structured technical document: abstract, introduction, pinout analysis, schematic explanation, component selection, PCB layout considerations, and application notes.
Below is a complete technical brief written in the style of an application note or short research paper.
Technical Analysis and Application of the STK411-210E Audio Power Amplifier Circuit
Author: Engineering Analysis Division
Date: April 2026
Subject: STK411-210E Circuit Topology and Implementation stk411-210e circuit diagram
6. Comparison with Other STK41xx Series
| Model | Power (6 Ω) | Voltage | THD | Package | |-----------|-------------|---------|-------|---------------| | STK411-110E| 2 × 15 W | ±22 V | 0.4% | Thin SIP-12 | | STK411-210E | 2 × 30 W | ±28 V | 0.4% | Thin SIP-12 | | STK411-310E| 2 × 40 W | ±32 V | 0.4% | Thin SIP-12 | | STK412-150E| 2 × 50 W | ±35 V | 0.08% | Thick SIP-12 |
The 210E is ideal for 30W/ch into 6Ω or 25W/ch into 8Ω. This is a specific request, as the STK411-210E
Abstract
The STK411-210E is a class-AB audio power amplifier integrated circuit (IC) in Sanyo’s STK400 series, designed for low-to-medium power consumer audio equipment such as stereo radios, mini-compo systems, and active speakers. This paper presents the internal block diagram, external circuit configuration, power supply requirements, and PCB design guidelines. A complete circuit diagram is derived from the typical application data provided by the manufacturer. Performance metrics and thermal management considerations are also discussed.
Part 4: Power Supply Circuit Diagram
The STK411-210E requires a symmetric split supply. Do not use a single-ended supply. Here is the recommended power supply circuit: Technical Analysis and Application of the STK411-210E Audio
AC to DC Block Diagram:
- Transformer: 32V-0V-32V (Center tapped) or dual 32V secondaries. Rating: Minimum 300VA.
- Bridge Rectifier: 400V, 10A (e.g., KBPC1004 or four 1N5408 diodes).
- Smoothing Capacitors: 6,800µF to 10,000µF per rail (rated at 63V or higher).
Circuit Connections:
- Transformer secondary A -> Diode Bridge (+) -> +Vcc (Pin 8)
- Transformer secondary B -> Diode Bridge (-) -> -Vcc (Pin 9)
- Transformer center tap -> Power Ground (Pin 12)
- Parallel small 0.1µF film capacitors across each large cap for high-frequency noise reduction.