Fun with Voltage Regulators

I’ve been spending a lot of time thinking about op amps and comparators lately. One of the common uses of an op amp is as a “unity gain” buffer, meaning that the output voltage is as close as possible to being the same as the input voltage. At a glance this might seem like a trivial thing, but it’s used to great advantage. For example, a resistive voltage divider can be used to derive some fraction of a lar ...

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Frankenbear Synthamajig using PIC16F877 microcontroller

Frankenbear Synthamajig Have you ever wanted a teddy bear that looks like Frankenstein and makes sounds like "bleep bleep bloooop de de bleep.... EHHHHHHHHHH...... dadadadadadadododododod bleep bleep bloop"? Look no farther, you have found it! Now you can perform the nights away with your new USB-Powered teddy bear instrument. Yay! bear1.MOV2 MB bear2.MOV1 MB Go get stuff. Go get stuff: 1 - Small white tedd ...

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Whac-a-Veggie using PIC18F4550 microcontroller

Whac-a-Veggie For this year’s Trunk ‘O’ Treat game I wanted to make a something fun and exciting for kids to play so I choose a Whac- a-Mole type game called Whac-a-Veggie using the Veggie Tales characters.   The Whac-a-Veggie game is played with a foam hammer in your hand and the veggie characters randomly popping-up quickly and you have to hit them on the head before they go back in there holes to sc ...

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A remote controlled power RGB LED mood light using PIC16F627A

A remote controlled power RGB LED mood light. Control the colour of a powerful LED light beam with a remote control, store the colours and recall them at will. With this thing I can control the colour of a bright light into many different colours using the three fundamentals colours : red green and blue. Adding them toghether with different intensity can yeld very great a range of colours from the visible s ...

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Mini F1 race track Grid Start Lights using PIC12F627A

(See big LED version here) My nephews got a Scalextric slot car racing circuit from Santa for Christmas. This was a blast-from-the-past for my brother and me and we were soon showing the kids how to race. However it quickly became apparent that "3-2-1-Go" wasn't the best way to start a race so I put this together to simulate the gantry lights used for starting F1 motor races. When the circuit is first power ...

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The Trickster – USB Computer Prank using PIC18F14K50

The Trickster - USB Computer Prank Plug The Trickster into your victim's computer, and it will randomly move their mouse while playing a game or using the desktop; Compatible with all operating systems Harmless fun: Acts as a second mouse, and goes away when you remove The Trickster from their computer Even if you victim is computer literate he will suspect a virus or a remote control software in first plac ...

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Teddy nightlight multicolor using PIC16F84A microcontroller

Teddy nightlight multicolor A nice night light multicolor, ideal for baby's room. For the realization I used: - Out of a pack of bubble bath for children in the shape of teddy bear - a nightlight with positive economic pressure - Complete circuit with a PIC16F84A (I was at home, but you can use any programmable microcontroller) - LED multicolor I started preparing the teddy bear, all the markings on the pac ...

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POV Toy

I recently had the urge to create some “eye candy”; Thinking along the lines of my LED Sign (it’s not dead, just waiting on parts!), I chose to create a similar effect, using only a single line of leds, instead of a 5×7 array. Persistence of Vision is some sort of effect, either psychological or biological in nature, that allows our eyes and brain to ‘see’ motion and patterns in a sequence of rapidly stills ...

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Minidot 2 – The holoclock using PIC16F88 microcontroller

Minidot 2 - The holoclock Well maybe holoclock is a little bit inaccurate....it does use holographic dispersion film on the front to give a bit of depth. Basicaly this instructable is an update to my previous Minidot located here: http://www.instructables.com/id/EEGLXQCSKIEP2876EE/ and re-using a lot of code and circuitry from my Microdot located here: http://www.instructables.com/id/EWM2OIT78OERWHR38Z/ Eag ...

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Aurora 9 bar – The Essence of Aurora using PIC24F08KA microcontroller

Aurora 9 bar - The Essence of Aurora Since the introduction of Aurora 9x18, I received many requests for the kits and PCBs. I'm still quite undecided about making those available for a few reasons. However I really want other LED lovers (ok that might sound too much to be able to build one themselves. So I came up with Aurora 9 bar. It's a bare essential version of Aurora 9x18. In fact the circuit is almost ...

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