Archives: Projects

A rechargeable battery's load should be disconnected at the point of complete discharge, to avoid a further (deep) discharge that can shorten its life or destroy it. Because a battery's terminal voltage recovers when you disconnect the load, you can't simply disconnect the load when...

This ATX Power supply breakout board enables users to use an ATX power unit as a benchtop power supply. The project can be very useful to power physical computing, embedded, microcontroller projects, etc. The board provides 4 different voltages 3.3V, 5V, 12V, -12V, and a slide switch...

The project presented here is a sensitive sound sensor. The circuit converts sound frequency and outputs DC voltage.  The board consists of LM358 OPAMP and LM2907 IC. LM358 is used as a dual-stage microphone preamplifier and LM2907 acts as a frequency to voltage converter. The...

This is an AB class audio amplifier based on the TDA7388 chip and it is a great choice for car audio applications. This compact board has 4 channels each 26W with 4 ohms speaker. Then IC consists of a fully complementary PNP/NPN configuration and the TDA7388 allows a rail-to-rail...

The project described here is a Quad-channel digital isolator with 5000VRMS isolation ratings per UL 1577. The board has three forward and one reverse-direction channel which makes this project ideal for isolated SPI interface between microcontroller and subnode unit. The circuit...

This is a low noise Headphone Amplifier capable of delivering 105mW per channel of continuous average power into a 16Ω load with 0.1% (THD+N) from a 5V power supply. The project is based on the LM4811 chip from the boomer series. The board provides high-quality output power with a...

This project offers a dual−channel low component count interface solution for ground-referenced variable reluctance sensors. Each of the two identical channels interfaces with a variable−reluctance sensor, and continuously compares the sensor output signal to a user−programmable...

This is a powerful yet small size low profile brushed DC motor drive system with a few key features like adjustable constant current control, direction control, brake controls, Alert output, PWM for speed control etc. BD63130AFM chip is the heart of the project which is an H-bridge...