HOW TO TRICK AN OP-AMP

摘要

Many times during my illustrious career as an electronic hobbyist, I have designed devices that incorporated op-amps. As these projects usually operated from a transformer/rectifier type power supply, I would design the supply to produce both positive and negative voltages which would satisfy the op-amp. Nowadays, as it seems everything is battery operated, I find myself designing stuff around that very popular "nine volt battery" and more recently around five volt USB power.