Friends circuit is designed by me and has been working super efficient. 4700 uF 4 years of neglect, especially in trafoyu down tank 60w super efficiency of using 100% guarantee that you will receive. 4 pcs 4700uF filtering sound... Electronics Projects, TDA1554Q 2X22W Amplifier Circuit "audio amplifier circuits, ic amplifier, " Date 2019/08/01