How to build a simple but cool IR (Infra Red) receiver.

[-] 4.7μF electrolitic capacitor: electrolic capacitors are polarized, so you have to connect the correct lead to ground; there are some non-polarized capacitors on the market and as long as they have 4.7μF capacitance they will be just fine, perhaps only a bit more expensive.

4.7μF electrolitic capacitor