Stk411-210e Circuit Diagram — Hot

The STK411-210E is a 12-pin SIP (package code: SIP-12). The pinout is as follows:

| 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) | stk411-210e circuit diagram

Internal Architecture:
The chip contains a differential input stage (LTP), voltage amplifier stage (VAS), and complementary Darlington output transistors for each channel. A simplified internal block diagram is shown in Figure 1 (conceptual). The STK411-210E is a 12-pin SIP (package code: SIP-12)

Below is a simplified but complete stereo circuit using the STK411-210E: voltage amplifier stage (VAS)

                          +Vcc   +Vcc
                            |      |
                            └──┬───┘
                               │
                         10µF  │  100µF
                          ┌┐   │   ┌┐
                          ││  (7)  ││
          CH1 INPUT ──┬─22kΩ──2│   │6─┬─ TO SPEAKER (R)
                      │        │  STK  │  │
                      │   47pF │ 410E  │  │
                      └─47kΩ──1│      3│─GND
                              │       │
          CH2 INPUT ──┬────9   │       │
                      │      10│       │47pF
                      └───────────────┘
                   GND──────3────────GND
                           │
                          -Vcc

The typical application circuit is a dual-supply, capacitorless output design (no output coupling capacitor needed). Below is a detailed component-level schematic.