| This article shows a simple circuit for slow charging while preventing any risk of overloading the battery. The circuit consists of just fou...
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| A window comparator that monitors whether its input voltage Uin lies within a defined voltage window can be built using only a few component...
| There is hardly any field in the world of electro-mechanics that has not found an application for the stepper motor. They are used extensive...
| Sometimes the need arises to construct a really simple oscillator. This could hardly be simpler than the circuit shown here, which uses just...
| This circuit is suitable in every situation where over-current protection is required. Here we give an example from the model train world.Ev...
| The technical demands on microphones used with radio equipment are not stringent in terms of sound quality: a frequency response from around...
| This cable tester allows you to quickly check audio cables for broken wires. Because of the low power supply voltage, batteries can be used...
| This circuit eventually surfaced while pondering over the design of a current indicator for a small power supply. Fortunately, it proved pos...
| Complicated charge controllers and inverter circuits can be used to squeeze the last drop of energy out of a solar panel. Contrary to popula...
| How do you know accurately if a magnet is stronger or weaker than one you’ve dubbed your reference device? This simple to build instrument h...