DC Motor IR2104 H-BRIDGE
https://www.electronics-lab.com/ir2104-h-bridge/
H-Bridge has been designed around IR2104 IC from international Rectifier. The board has been made mainly for DC-Motor application. The driver can handle load up to 8-10Amps. I have tested this board with 36V DC supply . The circuit uses N Channel IR540 MOSFETS from international rectifier. IR540 requires large heat sink for 10Amps load. […]
Build a Wireless Water Meter for Your Home
https://www.electronics-lab.com/build-a-wireless-water-meter-for-your-home/
David Schneider @ spectrum.ieee.org shows us how to watch over your water usage using an Arduino and a Raspberry Pi. He writes: California, where I once lived, is in the midst of a severe drought. Thankfully, I now reside in North Carolina, a much wetter state. But even here there have been years when water was in […]
Precision programmable current source uses two ICs
https://www.electronics-lab.com/precision-programmable-current-source-uses-two-ics/
by Stefano Salvatori & Pietro Oliva @ edn.com: This Design Idea mates a precision current source IC with precision difference amp chips to create a programmable current source or sink. The resistor-programmable current source/sink in Figure 1 illustrates the basic topology, taking advantage of tightly matched on-chip resistor ratios instead of relying on absolute tolerances. Precision programmable […]
PIC32 Bluetooth Starter Kit; DM320018
https://www.electronics-lab.com/pic32-bluetooth-starter-kit-dm320018/
The DM320018 PIC32 bluetooth starter kit comes with demonstration code that allows it to communicate with smart devices that are bluetooth enabled. It features the PIC32MX270F256D MCU for central processing and the FLC-BTM805 dual-mode Bluetooth HCI module. The kit also contains Cree high output multi-color LED, three standard single color LEDs for display, five push […]
1.6W Mono Audio Amplifier
https://www.electronics-lab.com/1-6w-mono-audio-amplifier/
1.6W Mono Audio Amplifier Project is based on TDA7231, which is class AB power amplifier with a wide range of supply. Power supply: 5 To 12 VDC Output: 1.6 W, 4 Ω / 1 W, 8 Ω Low crossover distortion, soft clipping PR1 Preset for Volume Adjust Terminal pins for connecting power supply, input and […]
Speech Recognition with Arduino and BitVoicer Server
https://www.electronics-lab.com/speech-recognition-with-arduino-and-bitvoicer-server/
leandro4b @ instructables.com shows us how to control some LED using your voice. He used an Arduino board and BitVoicer server to make this happen. In this Instructable I am going to show how to use an Arduino board and BitVoicer Server to control a few LEDs with voice commands. I will be using the […]
A DIY A4 Laser Engraver using ATmega328
https://www.electronics-lab.com/a-diy-a4-laser-engraver-using-atmega328/
Davide Gironi demonstrates his DIY A4 laser engraver made from a scanner and a printer using ATmega328: This “Get Ready For Win98″ Laser Engraving Machine it’s built using an old scanner, and an old printer. A laser engraving machine is a tool that uses lasers to engrave an object. A DIY A4 Laser Engraver using […]
Fake TV Security Light
https://www.electronics-lab.com/fake-tv-security-light-2/
RonM9 @ instructables.com has build a fake led TV security light based on Arduino and NeoPixel WS2812 LED ring. Fast & Easy Fake-TV Light module built for under $5; with enhanced features. With the use of this device you can go on vacation leaving your home with a lived in appearance and thus an added layer […]
Using Geophone Sensors to detect seismic events
https://www.electronics-lab.com/using-geophone-sensors-to-detect-seismic-events/
JTAdams @ jtadams.ca has build an interface for his geophones using Raspberry Pi and managed to record some seismic events on this. He writes: I have always been fascinated with how seismic detection can see what is under the ground. So much so, that I decided to try it for myself. It works by generating […]
Control accurate incremental voltage steps with a rotary encoder
https://www.electronics-lab.com/control-accurate-incremental-voltage-steps-with-a-rotary-encoder/
by Anthony Smith @ edn.com: Experimenting with an HF oscillator, I needed to control the varactor diode voltage in precise increments over a 2V-10V range. A buffered potentiometer was the obvious choice, and connecting two pots in series to give coarse/fine control (or using a multiturn pot) would offer improved control over the varactor voltage. However, […]