with lower distortion (0.4% THD) across a 20Hz to 20kHz range. Operating Voltage : Recommended power supply is approximately plus or minus 29 cap V , with a maximum limit of plus or minus 44 cap V : Encased in a miniature (14-pin) housing, measuring roughly 47mm x 25.6mm. Go-Radio.ru Circuit Components and Functionality
Inside the hybrid module, the STK403-070 contains:
The diagram identifies specific pins for signal input ( Ch1cap C h 1 Ch2cap C h 2 INcap I cap N ) and negative feedback ( NFcap N cap F ), which ensures high-quality sound with low distortion. stk403-070 circuit diagram
| Pin Number | Symbol | Function | |------------|--------|-----------| | 1 | Non-inverting Input (+) | Audio signal input from preamplifier | | 2 | V- (Negative Power Supply) | Connects to -VCC (negative DC rail, e.g., -40V) | | 3 | Ground (GND) | Signal and power ground reference | | 4 | V+ (Positive Power Supply) | Connects to +VCC (positive DC rail, e.g., +40V) | | 5 | Output | Amplified audio output to speaker (via coupling network) |
: Uses coupling capacitors to block DC signals and resistors (often 56k or similar) to set input impedance. Feedback Loop with lower distortion (0
The STK403-070 is a high-performance, two-channel (stereo) audio power amplifier hybrid integrated circuit (IC) widely used in high-fidelity consumer electronics and professional audio equipment. It is valued for its compact design and the high reliability characteristic of Sanyo's STK series. A typical provides the blueprint for building or repairing a stereo amplifier capable of delivering approximately 60W per channel into 4–16Ω loads. Core Circuit Components & Layout
: If the STK403-070 is unavailable, the STK433-070-E is often used as a replacement, though it may require minor circuit modifications on Pin 1 to ensure a smooth, noise-free startup. | Pin Number | Symbol | Function |
To interpret the circuit diagram correctly, you must first understand the function of each of the five pins. The STK403-070 uses a standard SIP-5 configuration, with pins numbered from left to right when facing the printed side of the module.