When designing low-power USBcircuits that require power-supplyvoltages other than 5V, you must decidewhether to use a separate battery or aphysically small mains-based powersource. The problem is ...

Smoke is Released The power supply did a fine job of lighting up the HC-SR04 and I started getting the output I expected from the module. Until the next day. Something was wrong with the SONAR module.

As their names suggest, single-supply op amps aim to operate with one power supply, and their dual counterparts aim to operate with two power supplies. The application-circuit equations for both types ...