TL072 Stereo Headphone Amplifier

Boost a phone or laptop output to drive a pair of headphones with no clipping — two op-amps, a few resistors, and a small dual-rail supply.

Difficulty: Breadboard. Estimated build time: about 35 minutes. Estimated parts cost: about US$5.20. 12-part bill of materials with live supplier pricing. A two-channel headphone amplifier built around a single TL072 dual JFET-input op-amp.