Learn to make a Tengu, an LED Face which reacts to music of the environment around it. The tutorial will take you through the entire process from breadboard to PCB (Printed Circuit Board). Overall, it’s a pretty simple project to follow and costs $10. The origin of the project, can be found in the Tengu breadboard page.Ã‚ To amplify the music imputted, he used a LM386 Audio Amplifier. It’s a pretty awesome project, check out the video below.