| RC-5 is the Philips /Sony standard for infra-red [IR] remote control of audio /video equipment. The circuit and the listing given enable...
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| Although good and inexpensive integrated analogue-to-digital (A-D) converters are now readily available, it may be instructive to build o...
| The indicator shows when a fish has taken the bait. Until that happy moment (at least for the angler), the bite sensor is open, so that b...
| It is sometimes necessary to make a telephone conversation audible to more than one person at either end or to make a tape recording of i...
| The time-determining element in the present circuit is capacitor C1, which is charged via a current source based on T1. The voltage acros...
| A solid-state bell-push is far more robust than the usual mechanical type. The touch contact may be made from an audio socket, which has...
| Voltage doublers are frequently encountered in electronic circuits. The present one is a variation that is of interest since most digital...
| The circuit detects a change in video information and uses this to switch on an alarm in a closed-circuit television guard system of a vi...
| It is often not possible to put a second bell in parallel to the existing one, because the bell transformer is normally already fully loa...
| The lamp in slide projectors is normally controlled with the aid of a triac in series with it. This method reduces the brightness of the...