All items tagged with switch and technology (23)

1-07-1991 | The pump in sorne central-heating systems has two or even three speeds. At the lowest speed, not much hot water is pumped around the cir...

1-07-1991 | A frequent annoyance with battery-operated equipment is that just after you switch it on you notice that the battery is fIat. Quite proba...

1-12-1990 | 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...