| Electronic circuits that draw a current of more than a few milliamperes should preferably not be powered by a battery: most are, therefore,...
L. Pijpers (13)
| This playful project demonstrates the operation of a small electric vehicle which is capable of tracking a line. Inexpensive and easy to b...
| A single non-buffered HC inverter can be made to function as a stable oscillator. The crystal may be either a fundamental type (Iow frequ...
| If you have ever tried to start your car and found the battery (almost) as flat as a pancake, you will appreciate this miniature monitor,...
| The circuit presented here ensures that bicycle lights remain on for a little while after the bicycle (and thus the dynamo) has corne to...
| When a physical quantity (measurand) has to be measured at a distance. It is normally necessary to provide the sensor proper with an ampli...
| The board may be used either as shown in here. It may be used with transformers rated from 1.5 VA to 12 VA. When used with a very small...
| The regulator shown in the diagram enables the speed of a DC motor to be set over a wide range. Although the most frequently used method f...
| The supply described here uses two zener diodes and two rectifier diodes instead of the usual four rectifier diodes and one zener.
| For some reason or other, the principal feature of a PC seems to be its CPU clock speed, and that is probably why many PC users have devel...