K. Walraven (99)

1-12-2003 | At our editorial offices we are surprised (and delighted) how often we are being asked about relatively ancient circuits. In not a few cases...

1-07-2003 | The voltage regulators from the 78xx-series are found in many analogue power supplies. It seems, then, somewhat superfluous to say much more...

1-09-2002 | We have received many questions from readers regarding our microcontroller course. The most interesting questions are summarised in this lis...

1-02-2002 | A surprisingly high number of questions from readers that arrive on our desks deal with the subject of the interconnection of two separate (...

1-09-2001 | This circuit makes it possible to do something that was previously unthinkable: reversing the effects of sulphation in tired lead-acid batte...

1-12-2000 | Completely ‘self-supporting’ garden lamps using solar cells as their energy source are gradually becoming more and more common. How do they...

1-12-2000 | The IMT 901 IC from the German firm Nanotec makes it easy to build a stepper motor controller. You can find a data sheet with complete techn...

1-12-2000 | Now that white LEDs are available at reasonable prices, one nice application is an imitation of the night sky. The LEDs emit a rather cold b...

1-07-2000 | The subject of stepper motors is clearly very popular, with many reader responses to every published article. A design for a unipolar contro...

1-07-2000 | In a switch-mode power supply, the quality of the output voltage depends strongly on the quality of the electrolytic capacitors that are use...