Features: <br>20W Mono Channel HiFi Amplifier Board. <br>Made with high quality electronic components, stable and reliable. <br>Using military grade double-sided circuit board. <br>Reasonable layout, compact size. <br>You can assemble these components by yourself and obtain knowledge about amplifier board. <br> <br> <br> Specification: <br>Output power: Typical 20W (maximum 30W) <br>Speaker impedance: 4Ω-8Ω <br>Total harmonic distortion: <0.04% <br>SNR: 105dB <br>Frequency response: 14Hz-100kHz (maximum range 3.29Hz-482.29kHz calculated by RC high and low pass circuit) <br>Supply voltage: Recommended ± 25V (maximum voltage can not exceed ± 30V, 18V AC full bridge rectifier is 25V) <br> <br>Package list: <br>1 * Amplifier Board DIY Kit (Require assembly)<br>1、20W Mono Channel HiFi Amplifier Board. <br>2、Made with high quality electronic components, stable and reliable. <br>3、Using military grade double?sided circuit board. <br>4、Reasonable layout, compact size. <br>5、You can assemble these components by yourself and obtain knowledge about amplifier board.