In this installment of Circuit VR, we’ll look at a simple buck converter — that is a switching regulator that takes a higher voltage and produces a lower voltage.

An improved circuit with an optocoupler type TLP621 is shown in Figure 2. Figure 2 A circuit with an optocoupler (TLP621) which generates higher (even) harmonics that can be added to the original ...

Luckily, [Paul] sent in a great tutorial on building a LiPo charger that works over USB. In the original design of [Paul]’s board, he chose a Maxim MAX1551 Lithium battery charger.

This is a very simple touch light switch circuit that uses the 4011 IC, one transistor and a relay. The C1 capacitor stores the switching state at a certain time and is charged or discharged according ...

A simple electric circuit learns to classify data in a creative new design that could lead to more energy-efficient machine-learning hardware.