Bicycle direction indicator. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Consumer electronics
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The simplest direction indicator can be assembled on two elements 2I-NOT of the K155LA3 or K155LA8 microcircuit. The inputs of its elements are interconnected so that they form a two-stage amplifier, and the electrolytic capacitor C1, connected between the two elements of the microcircuit, and the tuning resistor R1 will turn it into a multivibrator with an oscillation frequency of 1-2 Hz. From the output of the second element, the pulses arrive at the base of the transistor VT1 and open it. Thus, the transistor operates in a key mode and periodically lights up two LEDs of the right or left side.
It is best to switch the LEDs with a three-position switch (toggle switch).
Assemble the electronic circuit on a printed circuit board or on a piece of thick cardboard measuring 51x31mm. Assemble the diagram. Then test it, adjust the optimal flash frequency with resistor R1. If you assembled the circuit on a piece of cardboard, then fill it on both sides with epoxy - this will minimize the risk that any wire will come off when shaking.
The circuit can be powered by a 4,5 volt battery. Or three AA batteries connected in series.
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