Zak Kemble

Most commented posts

  1. nRF905 AVR/Arduino Library/Driver — 548 comments
  2. AVRDUDESS – A GUI for AVRDUDE — 356 comments
  3. DIY Digital Wristwatch — 297 comments
  4. N|Watch – DIY Wristwatch Kit — 233 comments
  5. A Lithium Battery Charger with Load Sharing — 152 comments

Author's posts

AVR microcontroller based PWM fan controllers

If you’d like a fan controller kit please email me at blog@zakkemble.co.uk Kit: £10 Post: £2 if you’re in the UK, otherwise £4 Microcontroller will come programmed and ready to go. Only available while stocks last! So this is a bit of a continuation on my 555 timer based PWM controllers, but now using microcontrollers …

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First time with Arduino and AVR microcontrollers

Audio VU meter

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 I’ve unlocked a whole new world of electronics, for years I’ve looked at digitally controlled devices like LCDs woundering how …

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IR jammer

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 stopped working for some reason, it wasn’t until recently that I brought a mini DSO and found out it needed …

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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 that would be able to have at least 4 LEDs with minimal components and came across 2 that I …

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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 to boost the fan on to 100% for the first few seconds of receiving power and a ‘turbo’ button to set …

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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 devices consider ‘dead’ can be used, [Wikipedia article]. I made 2 versions of the joule thief, the common one with a single …

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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 transmitter can tuned between 87.5MHz – ~98MHz, however at the higher frequencies it’s much less stable and more …

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