More about time (745)

1-12-1991 | The switch described has two time ranges that are selected with a push-button. In the prototype, the ranges were 5 minutes and 20 minutes...

1-12-1991 | When a bicycle speedometer must be rugged, accurate and, above alt novel and a Iittle unusual, the 'high-rech' computerized LeD units fou...

1-12-1991 | Rectifying the buzzer signal on a telephone line results in a voltage that may be used to switch one or more loads, for instance, a light...

1-12-1991 | Many young children will insist on keeping the bedside light on for a couple of minutes after the storybook has been closed and father or...

1-12-1991 | This circuit has been designed primarily for use with valve amplifiers. When the arnplifier is switched on, filament voltage is supplied...

1-12-1991 | Some video cameras have a socket for a remote control unit. It appears, however that it is not always easy to connect an interval-contral...

1-12-1991 | Overcharging of batteries is prevented by the timely switching off of the charger. A timer that can be set to within a minute can be bui...

1-12-1991 | The measurement card for the indoor /outdoor thermometer "may be provided with the additional LED indicator shown in the diagram to check...

1-12-1991 | A type TL081 opamp and same passive components are sufficient to construct a small amplifier whose amplification can be varied between +...

1-12-1991 | Since there are still tape recorders about that have no mechanical tape counter, the circuit shown here offers an excellent, electronic a...