Estone New TDA2030A Audio Power Amplifier DIY Kit Components OCL 18W x 2 BTL 36W Dual-channel kit can be accessed by OCL or mono BTL circuit, flexible, wide range of applications. The famous 1% metal film resistors in China, Panasonic capacitors and Wima film capacitors, two Rubycon 3300uF/25V filter capacitors. Volume on the design board potentiometer.The circuit board design is reasonable, low noise, high performance-price ratio, is the beginner's first choice! Great PCB for Two kind of connections (OCL and BTL) Double kneading board design PCB Size:40mm X 92mm X 1.6mm Power Input:2 X 12VAC