A pair of alternating flashing LEDs makes an excellent visual alarm. One of the LEDs remains illuminated, so there's little chance the alarm will go undetected, even by a casual glance. Several ...
You know how it is. You’ve got that new project running, and while it doesn’t consume much power, it also doesn’t give much indication of whether it’s functioning or just sitting there with a dead ...
This simple and cheap circuit is not just for Christmas! There are just two resistors, a small-signal transistor such as a BC547, one ‘flashing’ LED and a string of ‘normal’ LEDs. The flashing LED ...
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