LED beacons. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Beginner radio amateur
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Such a device (see figure) can be installed, say, on a children's toy car by attaching LEDs HL1 and HL2 to the cab. Flashing alternately, the LEDs will create the impression of winking “beacons”, like on a special vehicle.
The basis of the device is a pulse generator made on elements DD1.1 and DD1.2. The pulse frequency depends on the capacitance of capacitor C1 and the resistance of resistor R1. From the generator, pulses are sent to the first inverter, assembled on element DD1.3. and from its output - to the second inverter (element DD1.4). The inverters each control “their own” transistor, opening them in turn. The emitter circuits of the transistors include LEDs in series with current-limiting resistors (R2 and R3).
The device can be powered from a 3336 battery or similar, or from three series-connected galvanic cells.
If you want to change the flash frequency of the LEDs, select capacitor C1 or resistor R1. The brightness of the LEDs is adjusted by selecting resistors R2, R3.
Author: A.Schegrenets
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