More about light (490)

1-07-1976 | The circuit of an a table multi- vibrator using a Schmitt trigger and a single RC time constant has fre- quently been used in Elektor. F...

1-07-1976 | This circuit gives a true imi- tation of the sound of wind. Transistor T 1 is connected as a zener diode and supplies T2 with a noise s...

1-06-1976 | LEDs are now finding applications in more and more varied fields and here is a unit to introduce them to the world of discos and the tr...

1-09-1975 | Various kinds of psychedelic flashing light display can be generated easily using logic shift registers. Several cir- cuits...

1-09-1975 | This simple triac dimmer can be used to control incandescent filament lamps up to 1500 W. The circuit operates on the phase-cont...

1-07-1975 | The IC 555 is normally used as a timer. The time delay for these applications is obtained by charging and discharging a capacitor betwe...

1-07-1975 | When existing amplifiers lack sufficient input sensitivity and no space is avail- able inside their case, separate low power pre-amplifier...

1-07-1975 | The frequency response of the human ear is limited. The purpose of the ultra- sonic detector if to overcome this limitation by changing th...

1-07-1975 | Many amplifier designs, both do-it- yourself efforts and commercial cir- cuits, have the bad habit of delivering a more or less hefty switc...

1-02-1975 | A favourite gimmick in disco- theques is to use flashing lights, which are usually synchronised to the music. An interesting addition is...