Archives: Projects

The project described here is a high-performance, quad-channel digital isolator with a 5000VRMS isolation rating as per UL1577. The ISO7740 IC provides high electromagnetic immunity and low emissions at low power consumption while isolating CMOS or LVCMOS digital I/O s. Each isolation...

This is an SPI Interface multichannel relay board for high voltage AC or low voltage DC loads. It is ideal for controlling LEDs lights, coffee machines, fans, pumps, or other high-voltage electrical appliances. The board also breaks out the SPI header, so controlling other boards is...

This project prevents/disconnects the load when an under-voltage condition occurs. The circuit latches the output when input sense voltage drops below the lockout threshold. Lockout threshold voltage can be adjusted using the onboard trimmer potentiometer PR1.  Tactile switch SW1 is...

This is an 8-pin SOIC/MSOP/SOT23-3/4/5/6 prototype board. This is a blank PCB that allows the operation of many chips from various manufacturers. Each device pin is connected to a pull-up resistor, a pull-down resistor, an in-line resistor, and a capacitor on VCC.  All pins are...

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...