Features ???? STRONG PERFORMANCE: This is a 20 W mono hi-fi amplifier board with reasonable design and low noise. Adopt military grade double-sided circuit board. Good heat dissipation performance with fan. ???? HIGH QUALITY: The power amplifier board is composed of high quality electronic components and precision craftsmanship, which can ensure the service life. Stable performance and high efficiency. ???? DIYABLE: The LM1875T power amplifier board is well laid out and compact. You can assemble these components by yourself and master the knowledge of the amplifier board. ???? SCOPE OF APPLICATION: The amplifier board has superior performance and comprehensive performance. It can be widely used in shop advertising, home theatre, square speakers and so on. ???? OPERATING CURRENT: Frequency Response: 14 Hz-100 kHz (Maximum range is 3.29 Hz-482.29 kHz, calculated by RC high pass and low pass circuits). Supply voltage: Recommended ± 25 V (maximum voltage must not exceed ± 30 V, 25 V for 18 V AC full bridge rectifier). Specification: Output power: Typical 20W (maximum 30W) Speaker impedance: 4Ω-8Ω Total harmonic distortion: <0.04% SNR: 105dB Frequency response: 14Hz-100kHz (maximum range 3.29Hz-482.29kHz calculated by RC high and low pass circuit) Supply voltage: Recommended ± 25V (maximum voltage can not exceed ± 30V, 18V AC full bridge rectifier is 25V) Package list: 1 * Amplifier Board DIY Kit (Require assembly) Package List