30W Precision FET Audio Amplifier

A precision-oriented 30W direct-coupled FET power amplifier board designed for discerning builders and technical users. Size: 100 × 50 × 40 mm. Construction integrates PCB layers with metal structural elements to improve thermal mass and reduce mechanical resonance. Electrical performance includes 30W output into 8 ohms, Class A operation at ±28V, 100, SNR >96 dB, slew rate >30 V/µs, 0.5 V RMS input sensitivity, 10 kΩ input impedance, and 31 dB gain. Operates optimally at ±24V DC, with absolute maximum supply of ±28V — compatible with standard 20V AC transformers using full-bridge rectification. Unlike general-purpose amplifier modules, this board prioritises measurement-grade linearity and time-domain accuracy. Its direct-coupled topology supports true DC gain stability and eliminates capacitor-related time constants — making it suitable for active filters, servo-controlled subwoofers, feedback-based loudspeaker correction, and academic electronics labs focused on amplifier theory and characterisation. All specifications reflect actual bench measurements — not datasheet projections or typical-values estimates — ensuring realistic expectations for final system performance and repeatability across builds.