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 ...

This is probably the simplest idea to generate flashing light from an LED using AC. The circuit is relatively the simple way of flashing one or more LEDs from a high voltage DC obtained from Mains.

Modern Wi-Fi routers give you a lot to work with in terms of troubleshooting issues at home. This is mainly in the form of various LED (light-emitting diodes) indicators that flash to show what ...