Archive for the 'Circuit' Category


USB Li-ion battery charger

This is a charger for lithium ion batteries which takes its power from the USB port of a computer.



It uses the MCP73861 or MCP73863 Li-ion battery charger chip manufactured by Microchip.


By: neelandan

Four port USB hub

This is a four port USB 1.1 hub built on a tweety bird theme.


By: neelandan

A Simple Circuit Game

Make a neat little game using a simple circuit.


By: intoon

Night-Owl Alarm

This is a device that is designed to alert owls that it is nighttime. I made it for my little brother.


By: randofo

41 LED Flasher Circuit using 555 IC

I made this as a quick project I made to use a lot of the LEDs I recently got. It basically connects via a 555 8 pin IC and allows for adjusting the time between the flashings by changing the resistor or capacitor values. It provides for a cool looking effect in a dark room. Use your favorite color LEDs and enjoy!




By: supes

Rain Detector

Make a rain detector with a few household items. A great project for the kids!
By: howtoons

Eagle-ize Leevonk’s PIC protoboard

I like Leevonk’s PIC development board; here it is re-done in Cadsoft
Eagle, with a couple other modifications to make it simpler/cheaper
By: westfw

DIY Polygonal Top-Loading Electric Kiln

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Check out this detailed building of a 5.6 c.f. 37.5 amp polygonal top-loading electric kiln:
“This set of pages diarizes the construction of my kiln. I fire to cone 6 oxydation and use an electric kiln to do so. The kiln I’ve used till now is a very old cone 1 Olympic, it […]

DIY Gameshow-style Hand Buzzers

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Nick writes:
“After more than 5 months of playing “You Don’t Know Jack” on the arcade and ignoring the little voice in the back of my head telling me to build some hand buzzers, I finally caved. Using the tutorial at Arcadeparadise.org as a starting point of sorts, I decided to take […]

nPod: Portable NES Console

(Click Image to Enlarge)

From benheck comes the nPod portable NES:
“Well of course I have to tell some sort of story with this “Making Of” so here goes. A few months ago I’m sitting around, probably soldering something, when a friend calls me up. Seems he’s over at St. Vincent De Paul’s (I guess some sort […]

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