| With the help of a quad opamp, a bi-color LED and a few passive components you can quickly build a simple signal level meter which has thr...
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| For a change, this simple touch-sensitive switch does not operate by detecting the resistance of the skin between two points or measuring...
| Hell! I moved my control stick left and my model veers off right! And down is up! Here’s a simple solution to the problem.
| Circuits that automatically turn off battery powered equipment after a set period are commonplace. To promote good battery life it’s imp...
| This simple circuit detects noise in a room and activates a beeper if the noise exceeds an adjustable threshold level.
| According to Wikipedia, ‘A gadget is a small tool such as a machine that has a particular function, but is often thought of as a novelty.’...
| With stress a proven cause of various illnesses and afflictions various forms of ‘autogenic’ training as a means of relaxation have hit...
| For occasional measurements of digital circuits there is no need to get hold of a real logic analyzer. With the help of several ICs it’s po...
| There must be many PC users out there with an old USB keyboard kicking around in a junkbox somewhere. Maybe it’s got a mechanical fault you...
| There can’t be many television networks worldwide that aren’t running some version of the ‘Wheel of Fortune’ game show. You know the one wh...