Sorting out the Velleman MK170 Christmas Star

Star After Mods

Last Christmas I bought a Velleman MK170 Christmas Star project for my Wife to build.  She often shows interest in my various electronics projects and I thought it would be a good way for her to build something that she could show off to friends and family, whilst at the same time teaching her a… Continue reading Sorting out the Velleman MK170 Christmas Star

Simple circuit for controlling LED brightness

The LED Dimmer Pack

Recently I was asked to produce a circuit to create a variable ‘dim’ control for an existing LED based exhibition. I decided to go with a simple 555-timer based design which provides control of the pulse width of an output, whilst keeping the oscillation frequency fixed. The circuit is shown below.  It’s an unusual design,… Continue reading Simple circuit for controlling LED brightness

RC5 Decoder

The finished RC5 Decoder in action

Introduction I completed this design a number of years ago when I was still learning to program.  In fact, this was my first “proper” project that I directed my new-found programming skills towards.  My programming skills have improved by many orders of magnitude since, and with that in mind I was a bit ambivalent about… Continue reading RC5 Decoder