Theft preventer Warning
This circuit utilising a 555 timer IC can be used as an alarm system to prevent the theft of your luggage, burglars breaking into your house etc. The alarms goes ON when a thin wire, usually as thin as a hair is broken.
The circuit is straightforward. It uses a 555 IC wired as an astable multivibrator to produce a tone of frequency of about 1kHz which gives out a shrill noise to scare away the burglar.
The wire used to set off the alarm can be made of a thin copper wire like SWG 36 or higher.
You can even use single strands of copper form a power cable. The circuit operates on a wide range of voltages from 5V to 15V.
The speaker and the circuit could be housed inside a tin can with holes drilled on the speaker side for the sound to come out.
Share a keyboard, monitor and mouse with several computers
Although not technically a networking issue, we often get questions about how to share a single keyboard, video monitor and mouse among several computers. The answer is easy enough once you know about KVM switches, so called because they help you share a keyboard (K), video monitor (V) and a mouse (M).
This how-to article provides some background on the topic, looks at the latest in KVM technology (in this case from Belkin) and shows you, step-by-step, how to set up a KVM switch.
A little background
Here is the basic idea of a KVM switch: It has jacks for your keyboard, monitor and mouse. It has additional jacks for cables that run from the switch back to each computer to control the keyboard and mouse, and to provide an image via the monitor output. The KVM then has some method to allow you to switch between the computers being controlled.
Courtesy kvmswitches.com
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