Product Singlechannel (mono) power amplifier board. For stereo use, install two boards (one per channel). Key benefits — why you need this board output and strong drive: with a sufficient dual supply the board can easily reach 200 (with adequate power), delivering the headroom needed to drive large drivers without audible strain. Robust sound quality: the topology and selected transistor pairs provide solid dynamics and control, producing a clear, powerful sound suitable for PA, bass, and power speaker systems. Flexible power range: accepts a wide dual (split) supply range, giving flexibility for different installation needs while retaining stable performance. Technical highlights (what makes it stand out) Circuit topology: doubledifferential input stage for lownoise, stable amplification. Input and driver transistors: A970 / C2240 used as a current differential pair; A1145 / C2705 used for voltage amplification and to drive the power driver pair A1837 / C4793. Output stage: power A1943 / C5200 transistor pair in the final output, chosen for reliable current delivery to speakers. Power supply: designed for dual (split) supply operation from ±20V up to ±90V. The upgraded version includes optimized circuitry and component selection; however, direct application of voltages above 90V is not recommended. Performance and compatibility Can push a 15inch loudspeaker without noticeable stress when provided with adequate power. Compatible with systems that accept a mono amplifier module; two boards are required to build a stereo amplifier. Designed for current, power audio applications where driver control and headroom are priorities. Important notes and safety Use as a dual (split) power supply: negative/positive rails in the range of 20V to +90V. The upgraded board has improved parts and layout, but do not exceed the recommended voltage range. Ensure an appropriate power supply and cooling for output operation. Suggested applications Live sound reinforcement for smalltomedium venues where a single power channel is required (use two boards for stereo PA). Bass or subwoofer amplification driving a 15inch speaker for rehearsals, small clubs, or studio monitoring. DIY power mono amplifier projects where reliable transistorlevel performance and strong drive are needed. What's included / required Singlechannel power amplifier board (mono). Power supply, heatsinking, and enclosures are required separately. For stereo systems, a second identical board. If you need physical dimensions, mounting hole locations, or further technical specifications (gain, input sensitivity, expected wattage into specific impedances), request the detailed datasheet for this board.