Presented here is one ‘universal’ power supply unit for today’s microcontroller projects. The circuit is a compact power supply capable of providing +5 and +3.3V regulated outputs as VCCs (VCC1 and ...

Like any measurement system, though, 4–20-mA loops need calibrating. There are many loop calibrators on the market (Figure 2 ), but they can cost up to $2000. As an alternative, we’ve designed and ...

This circuit solved a problem encountered in developing a portable device with an ARM Cortex-M0 processor. The power supply consisted of two AA batteries (2 × 1.5 V), and I needed to signal the ...

Most of you know how an NFC tag works. The reader creates an RF field that has enough energy to power the electronics in the tag; when the tag wakes up, two-way communication ensues. We’re ...

The audio component centers around the SS8550 PNP transistor (Q1) which serves as a driver for the passive buzzer (BZ1). This ...

This microcontroller-based control circuit adjusts the speed of a small permanent-magnet DC motor to one of four speeds as selected by a pair of photosensors.

Process migration and improved circuit design have resulted in major power savings over the years. However, this exposed leakage current as a major source of energy loss, particularly in systems that ...