This is a simple dual power supply using voltage regulator IC 78xx and 79xx series. It’s the best and simplest choice for most non-critical applications. The 3 terminals are input, ground and output. The 78xx & 79xx series can provide up to 1A load current and it have onchip circuitry to prevent damage in the event of over heating or excessive current.
Dual Power Supply 78xx-79xx series – [Link]
In the field of electromagnetism, flux is often refers to the integral of a vector quantity over a finite surface. The magnetic flux is also known as the integral of magnetic vector field B over a surface. This also means that the flux of the Poynting vector over a specified surface is the rate, where electromagnetic energy flows through the surface. Learn more about flux on the link below.
What Influx is? - [Link]
This project is an Arduino based alcohol breath tester using MQ3 alcohol sensor and some LEDs and resistors. [via]
Arduino alcohol breath tester - [Link]
This article discuss how AC motors work. AC motors are a little bit different from DC motors as they don’t require brushes and the speed is controlled by frequency instead of voltage. Check how they work on the link below.
How AC Motor works – [Link]
This project is a simple bat detector that allows you to hear any ultrasonic sound. It digital scales the ultrasonic sound down to human hearing range (20 Hz to 20 kHz). The bat emits ultrasonic range from 9 kHz up to 200 kHz! Therefore, to enable us to hear the frequency, you should create a bat detector device that can analyze up to 20 kHz. To achieve that, digital frequency division is used.
The Ultrasonic Bat Detector – [Link]
This project is a stepper motor driver for a 3D printer. This device is able to drive 2.5 amp Stepper motor so it can handle large loads.
Stepper Motor Driver v2a - [Link]
Aurora is a USB powered multichannel mixer in a typical dj form factor. The device features two linear channel faders, a single a/b crossfader and eight backlit buttons. Twenty four backlit knobs allow you to control effects.
Auroramixer – [Link]
Heart Spark is a heart-shaped pendant which flashes LEDs in time with your heart beat. A polar chest strap with transmitter (sold separately) is used to measure your heart beat, which is transmitted wirelessly to the pendant. An arduino-compatible circuit captures each beat as it happens and flashes LEDs. Schematics and board layout will be available soon. [via]
Heart Spark jewelry beats to your heart - [Link]