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The author wanted a very cheap and simple alarm for some of his possessions, such as his electrically assisted bicycle. This alarm is... -
Using a mobile phone while driving is dangerous. It is also against the law. However, you can use your mobile phone as a powerful music p... -
This circuit alternately flashes 2 white LEDs, on a 3v supply and produces a really bright flash. The circuit produces a voltage above... -
The author had a problem: the neighbours had exactly the same type of doorbell as he did (actually a 50 Hz buzzer), so it wasn’t alway... -
Using a few diodes and a LED, you can make a nice indicator as shown in associated schematic diagram that can be used for a lot of appl...
