It is impossible to imagine a present-day society without any batteries. Count the number of gadgets in your house that are powered by batteries, you will be stunned by the number of batteri... Read more
When batteries are used to power a circuit, there is always the problem that the battery voltage drops during operation. A National Semiconductor type LM3354 IC (www.national.com/ 0ds/LM/LM3... Read more
All simple constant-current sources generally operate on the same principle: a current is allowed to flow through a resistance and some sort of regulator is used to try to hold the voltage a... Read more
This circuit is intended as an extension for (pre-) amplifiers, to increase the number of inputs. Ever since the introduction of MD-recorders, DVD players, etc., the owners of older amplifie... Read more
Lithium-Ion cells require a totally different charging protocol to that for NiCd or NiMH cells, a protocol that has to be followed precisely. During the last year, we have already published... Read more
The use of solar photovoltaic (PV) energy sources is increasing due to global warming concerns on the one hand, and cost-effectiveness on the other. Many engineers involved in power electron... Read more
This Wien bridge oscillator (after Max Wien, 1866– 1938) produces a low-distortion sine wave of constant amplitude, from about 15 Hz to 150 kHz. It requires just four opamps and will work of... Read more
This all-analog, microcontroller free (!) project got designed in response to cries for help from a diehard model plane enthusiast on the Elektor staff. He likes to fly large high powered mo... Read more
In numbers, there are probably more chargers around for NiMH than for Lithium-ion or Lithium-polymer batteries. If you wanted to use the latter you’d have to integrate the charger circuit, m... Read more
Color LED strips are now available at low cost in all sorts of types and sizes. With the controller circuit described here, you can set your own colors and even configure and run complete li... Read more
