The switch of a bunch of LEDs on two microcircuits. Scheme, description

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The switch of a bunch of LEDs on two microcircuits. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Color and music settings

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A master oscillator is assembled on the DD1 chip, the task of which is to constantly kick the counter so that it counts the kick pulses and switches the outputs.

(click to enlarge)

The pulse frequency is about 5 Hz.

By the way, as an experiment, you can try to zababahat instead of a constant resistor R1 variable, with a value of 4,7 kOhm. The LEDs at the output of the counter are turned on in antiphase to each other, so that, for example, at 1 at pin 3 of DD2, HL1 and HL2 are lit, and at 0, HL9 and HL10. The same goes for the rest of the conclusions. LEDs - almost any, different colors.

Publication: radiokot.ru, cxem.net

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