The is a classic example of Sanyo's thick-film hybrid integrated circuits, specifically designed as a two-channel shift power supply audio power amplifier . Unlike standard monolithic ICs, these hybrid modules house multiple semiconductor dies—like power transistors and resistors—mounted side-by-side on a ceramic substrate, creating a compact yet high-performance "black box" for high-fidelity audio equipment. Technical Highlights
| Parameter | Conditions | Min | Typ | Max | Unit | |-----------|------------|-----|-----|-----|------| | Output Power (both channels) | THD = 0.4% | 140 | 150 | - | W | | Total Harmonic Distortion | Po = 50W | - | 0.08 | 0.4 | % | | Frequency Response | -3dB, 1W | 20 | - | 50k | Hz | | Input Impedance | Non-inverting | 33 | 55 | 82 | kΩ | | Voltage Gain | Open loop | 80 | 85 | - | dB | | Closed Loop Gain | Typical circuit | - | 40 (x100) | - | dB | | Output Noise Voltage | A-weighted | - | 0.6 | 1.2 | mV | | Supply Current | Idle (no signal) | - | 120 | 180 | mA | Stk412-230 Datasheet Pdf
