More about Alarm (115)

1-07-2004 | This circuit was designed to produce an audible alarm when the mains power is interrupted. Such an alarm is essential for anyone whose livel...

1-07-2004 | Sometimes the need arises for a simple, gated, pulsed alarm. The circuit shown here employs just four components and a piezo sounder and is...

1-07-2004 | Most darkness activated alarms employ opamps and some logic ICs. Here, a less expensive approach is shown based on the eternal 555, this tim...

1-02-2004 | Although digital alarm clocks have been around for years, most of today’s off the shelf products suffer from serious design limitations. For...

1-01-2004 | A regular alarm clock, whether stuffed with electronics or of the mechanical variety, will not get you very far if you need to be reminded o...

1-01-2004 | This is a circuit of a simple but effective burglar alarm, which shows the status of each sensor with a separate LED. This allows you to see...

1-12-2003 | This circuit can be built from readily available low-cost components, some of which may even be hiding in your junkbox! The indicated value...

1-09-2003 | It’s probably the worst nightmare for all PC owners: The fan has been quietly doing its job keeping the PC internals nice and cool but over...

1-07-2003 | The circuit presented here is a very simple and yet highly effective alarm system for protecting an object. The circuit requires no special...

1-12-2002 | Unfortunately, these days it is no longer an inordinate luxury to protect your car against break-in and theft. Many car insurance companies...