Everything you need to know about diodes

Diodes are commonly used discrete semiconductor device. It has many uses and purposes. Its operation is based on PN semiconductor junction characteristics. Depending on diode physical and chemical properties it can behave very differently. Together with other electronics components diode can be used for voltage clipping, multiplying, rectifying, signal, demodulation, protection and even more. Elektro-labs have written pretty nice review of diode types and their common uses. Simplest and probably most recognizable is regular diode which is used in switching, protection rectification circuits. Another common diode type is Zener which is used for voltage stabilization, then list goes on LEDs and photo-diodes and finishes with more exotic ones – tunneling diodes and varactors. Continue reading

The Astonishing POV Propeller Clock

Could you guess which the most common household gadget is? Well, believe it or not, according to the survey, clock is the most familiar gadget in every household (It wasn’t a surprise, isn’t it?) However, up to 90 percent of clocks are usually designed in a very boring style. Well, if you’re getting bored with it, and you like something more spiffy here, maybe the POV propeller clock is going to light up your life! For this project, one of the biggest problems is to find a motor. First of all, the motor need to be very silent and has the ability to make more than 25 turns per second! In addition, the motor that being used must able to transfer the power from the clock circuit to the POV PCB continuously. Beside that, those components you’re needed for this project are: Ball bearing (It’s for holding the top end of the motor). A .047F capacitor (It keeps the PIC powered up and allows you to set the time). A miniature 3V lithium watch battery. A Zener (It regulates the… Continue reading