Bicycle power plant. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Home, household, hobby
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The headlight and taillight of a bicycle shine only while the car is moving, when the bicycle generator ("dynamo") is running. A simple electronic device will help you correct this shortcoming. Here's how it works.
When the bike starts moving, relay K1 is activated (see the circuit diagram) and, with its contact group K1.1, connects the HL1 lamp to the generator. At low speed or stop, the voltage applied to the K1 winding drops, and the movable plate returns to its original position, connecting the HL1 lamp to the GB1 battery. So that at the moment of switching the lamp does not blink, a high-capacity oxide capacitor C1 is connected in parallel with it, which feeds the lamp during pauses. As a result, the headlight gives light both when the bike is moving and during stops.
Schematic diagram of the automatic headlight switch
The device can use diodes of the D226 or D7 series, capacitor K50-6, relay RES-10 (passport RS4.524.303).
The automatic switch is mounted on a printed circuit board 60X50 mm in size (see figure), made of foil fiberglass or getinax 1 ... 1,5 mm thick. The board with the battery is placed in a regular tool bag and placed in front of the bicycle frame. For the switch at the end of the bag, you need to cut a hole Ø 10 ... 12 mm.
Circuit board of the automatic device with the layout of the elements
The location of the electronic device on the bike frame: 1 - tool bag with board and battery, 2 - switch, 3 - tool bag
Author: A.Lementuev
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