| The alarm circuit uses infra-red light beams to bridge distances between 3 m and 5 m (10 ft to 16 ft), but if the transmit diode is give...
| The alarm circuit uses infra-red light beams to bridge distances between 3 m and 5 m (10 ft to 16 ft), but if the transmit diode is give...
| elektor july/august 1985 A bicycle or tricycle should, as everyone knows, be fitted with front and rear lights. The noteworthy aspect of the...
| This circuit is designed to give an audible and visible warning to the absent-minded motorist who forgets to switch off...