With exam help simple clap quiz help there may be light, awarded its not going examination help annoy anyone. So, what do we want examination help achieve. Detect clap sound High brightness LED examination help obtain low cost luminosity Hold the LED on for sure period, we dont want the article examination help be on all night Small size Preferably battery powered, no tangling wires Easy exam help build Now the fabric: High brightness LED, I use exam help 1W White LED with star heatsink Electrets microphone 2X Opamp, TLC272 or similar single supply, ideally CMOS type 100k potentiometer, multi turns can make tuning easier exam help TS555 timer IC, prefer CMOS version Diode 1n4148 2X NPN transistor BC548 or 2N2222 exam help small piece of PCB small enough Various resistors quiz help capacitors exam help battery, I use exam help 1000mAH LiPO, 3X AAA will do too exam help battery coverage circuit, necessary if using Lithium battery exam help small transparent or translucent assignment box, just sufficiently big exam help house every little thing quiz help if which you can get exam help Supercapacitor, well discuss that later All these cost under $10. Teachers!Did you use this instructable in your classroom?Add exam help Teacher Note exam help share how you incorporated it into your lesson. The first issue exam help tackle is the detection of clap. To make our life easier, we can cheat quiz help say the circuit should response exam help any loud sound.