The read/write heads of a hard disk drive are moved back and forth over the magnetic platters by a linear motor. This motor consists of a coil that moves in a strong magnetic field, combined... Read more
To detect the arrival of a particular range of voltage(s) from the swing of an input signal, this circuit is used. Two Op-Amps in comparator mode are used in this circuit. A lower comparator... Read more
There are only a limited number of switching regulators designed to generate neg-ative output voltages. In many cases, it’s thus necessary to use a switching regulator that was actually desi... Read more
Physicians and repair engineers often use small light pens for visual examination purposes. Rugged and expensive as these pens may be, their weak point is the bulb, which is a ‘serviceable’... Read more
Electronics engineers very often need to measure low voltages with great accuracy, for example, the voltage from a pressure or temperature detector, or the output voltage of a Wheatstone bri... Read more
Klaus Jürgen Thiesler’s ‘2-Wire Interface’ was published in Elektor magazine in the form of both basic [1] and low-current [2] versions. Each variant used two transistors and a handful of ot... Read more
Armed with a Smartphone you can surf the Web, send emails, text, chat, download and listen to music, take and post photos and video clips, listen and view TV stations, navigate, place bets a... Read more
Tapes for electric fences are available in various qualities and forms, with differing characteristics. They are usually made by interweaving threads in polyethylene, nylon, or some other sy... Read more
The simplest way to make an adjustable constant current source is to use a voltage regulator in a suitable configuration: an example of what is needed is given in the LM317 datasheet. Howeve... Read more
Overall, electromechanical scooter starter solenoids are cheap enough — but the downside is that they’re not very reliable. The contact resistance increases over time, the coil can be open-c... Read more
