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First time with Arduino and AVR microcontrollers

I had been eying up Arduinos and looking into getting started with digital electronics for a while and now finally brought an Uno along with a 16×2 character LCD with RGB backlight. Wow. It’s like ...


IR Jammer

This is a simple 555 timer based circuit which can jam IR (Infrared) communications like TV remotes, when I first made the circuit (October 2011) it was a bit iffy at jamming IR and eventually stop...


LEDs looking pretty

I haven’t really used LEDs all that much other than as power indicators or in a joule thief, perhaps it time to make some pretty flashy things. 😀 I went searching for some LED flashing circuits th...


PWM Fan controllers using the 555 timer IC

Here I made 3 slightly different PWM fan controllers based on the 555 timer for controlling a large server fan – Delta FFB1212EHE, 3A peak, 2A normal load, other features of these controllers are t...


Joule Thief

In case you’ve not heard of a joule thief before, they’re simple voltage boost circuits, usually used to drive light loads like LEDs with a single battery cell, even batteries that other electronic...


FM Radio Transmitter

Here’s a nice little FM radio transmitter, it has a range of about 100m – 200m with a 12V supply, decent audio quality and the microphone is very sensitive, with a 5pF – 30pF variable capacitor the...