More about time (745)

1-12-1990 | This amplifier is intended to be added to preamplifiers that have no phono input. Such a phono input is, of course, required for normal r...

1-12-1990 | The frequency of the sine wave oscillator shown here is determined by a direct voltage, Uc, of 0-15 V. The distortion on output signals o...

1-12-1990 | The light-emitting diode with integrated flasher is connected in series with the base emitter junction of tranaistot T1. This results in...

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...

1-11-1990 | At a still later stage, I constructed a second set of martix cards representing number-words in Dutch.

1-07-1990 | It has been some time since we published a 200+ Watt power supply like the one described here. Capable of supplying up to 10 A (and more i...

1-07-1990 | The purpose of this simple circuit is to deter potential car burglars simply by a brighlly flashing LED, implying that the car is fitted...

1-07-1990 | The electronic doorman enables a door to be opened automatically after a predefined delay from the moment a bell has been rung. It is int...

1-07-1990 | This straightforward circuit, based on four darlingtons, enables a d.c. motor to rotate clockwise or anti-clockwise under the control of two...

1-07-1990 | The most noteworthy element in this circuit is Th1, which is known in data books by no fewer than three different names: thyristor tetrod...