Automatic - LED switch. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Beginner radio amateur
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Studying the work of digital microcircuits, I assembled a simple, as it seems to me, automatic switch of four LEDs (see figure). It has only two microcircuits and two radio components, not counting the power source.
On the elements DD1.1 and DD1.2 of the first microcircuit, a pulse generator is assembled, following at a frequency of 3 Hz (if necessary, the frequency is changed by selecting a capacitor). Through the cascade on the PD1.3 element, the pulses are fed to two frequency dividers collected on counting triggers. The LEDs connected between the inputs and outputs of the triggers form a kind of decoder that displays the state of the triggers.
When the device is turned on, the LEDs flash alternately. If the LEDs are arranged in a row with a certain sequence, it is not difficult to achieve the effect of "running lights". By supplementing the device with a switch connecting pin 1 of the DD1.I element with either pin 2 or pin 7, you get the simplest lottery drum. In the first connection option, the LEDs still flash. and in the second one only one of them will burn - it is difficult to guess which one in advance.
In order to really make it impossible to guess which of the LEDs will glow after the generator is stopped by an additional switch, the capacitance of capacitor C1 should be reduced to any value within 1000 pF ... 0,1 μF.
Author: Evgeny Zubkov, Znamenok, Astrakhan Region
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