| As suggested by the prominent place it receives at the beginning of this free Supplement on the subject of upgrading old PCs, the motherboar...
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| active power buffer Frequently, a direct voltage is required in a circuit that must be free of hum and noise, but not regu- lated. For in- s...
| In this article we refer our answer to your questions and informations about our electric compartements.
| An amplifier is described which, after a tuning fork has been struck, gives a continuous 440 Hz tone (= International A), so that the user...
| The popularity of halogen light is still increasing, and rightly so because of some distinct advantages: the colour temperature is agreeab...
| Matrix keypads may be readily purchased by the horne constructor trom a large number ot sources, and they are usually competitively priced...
| Any push-button switch can be used as a bounce-free, change-over switch with the aid of two D-type bistables contained in a 74HCT74 and...
| Switches with change-over contacts with traditional debouncing circuits are not always usable or economical. Keyboard switches, for inst...
| A switch that keeps on giving pulses as lang as it pressed is often required. The circuit here uses the well-known Type 555 for this purp...
| EE JULY/AUGUST 1987 by R Kambach Any diode-based circuit that protects against reversal of the supply polarity introduces a certain voltage...