Electronics For You: Projects and Ideas 2001

В этом сборнике собрана коллекция электронных конструкций и пректов, которые были опубликованы в журнале Electronics For You. в 2001 году. Содержит более 90-а полностью провереных и готовых к использованию электронных схем.

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Only one of the two groups’ LEDs will turn on sequentially, depending on which of the two transistors (transistor T3 or transistor T4) is on, which, in turn, is dependent upon the phase sequence of the three-phase supply. This becomes clear from the following explanation of output (pin 1) while Q output remains ‘low’ as long as the phase sequence is clockwise. Therefore the Q output drives transistor T3 to extend the ground path for green LEDs D1 through D10 to show a clockwise-rotating LED ring.

Centronics interface Fig.

2Hz frequency). The second timer is triggered as before to produce a 1-second pulse in synchronism with the trailing edge of 5-second pulse. This circuit is important wherever a pulse is needed at regular intervals; for instance, in ‘Versatile Digital Frequency Counter Cum Clock’ construction project published in EFY Oct. ’97, one may use this circuit in place of CD4060-based circuit. 1µF capacitor and 10-kilo-ohm resistors R4 and R5. CIRCUIT HIGH-/LOW-VOLTAGE CUTOUT WITH TIMER IDEAS EDI DWIV .

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