| 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...
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| 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...
| The light-emitting diode with integrated flasher is connected in series with the base emitter junction of tranaistot T1. This results in...
| 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...
| The purpose of this simple circuit is to deter potential car burglars simply by a brighlly flashing LED, implying that the car is fitted...
| 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...
| This straightforward circuit, based on four darlingtons, enables a d.c. motor to rotate clockwise or anti-clockwise under the control of two...
| The most noteworthy element in this circuit is Th1, which is known in data books by no fewer than three different names: thyristor tetrod...
| As more and more electronics enthusiasts appear to have overcorne their initial doubts, misgivings and fears of working with surface-moun...
| In most variable power supplies, the correlation between the setting of the wiper of the relevant potentiometer and the output voltage is...