Please read (2.2) in (2) in: [https://easyeda.com/forum/topic/How-to-ask-for-help-and-get-an-answer-71b17a40d15442349eaecbfae083e46a](https://easyeda.com/forum/topic/How-to-ask-for-help-and-get-an-answer-71b17a40d15442349eaecbfae083e46a)<br> <br> because this describes how to approach almost exactly the situation you ask about. What you have not said is what sort of amplifier you want to build. Guitar amp? HiFi amp? PA? Mono? Stereo? Portable/battery powered? What output power? What input source/signal level? What input impedance? What speaker impedance? Frequency response? Distortion? Have a look at: [https://oshwlab\.com/example/Tesseract\_Guitar\_Practice\_Amp\-MjP71jBni](https://oshwlab.com/example/Tesseract_Guitar_Practice_Amp-MjP71jBni)