A player powered by a bicycle generator. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Home, household, hobby
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Having bought the player, I decided to adapt an on-board electric generator to power it during my frequent bike trips. I decided to use a homemade semiconductor rectifier as an adapter. The implementation of the idea began by choosing a circuit diagram of a half-wave valve on a diode with a smoothing capacitor. I soon became convinced that a regular bicycle generator with a power of 3-5,4 W and an output voltage of 6-7 V and a modified on-board electrical network using almost any medium-power diode and a capacitor with a capacity of 500-2200 microfarads in the rectifier are quite able to cope with a new task for them. As a result, the player began to receive a 3-volt power supply when the bicycle was moving at a speed of more than 10 km / h with the headlight on and at least 8 km / h - with the power off.
A more complex design, which made it possible to significantly improve the previous performance characteristics, was also made according to the classical scheme, but with an "extra" VD5 diode. Its purpose is to prevent the circuit from closing through an electrolytic capacitor when driving at high speed, the properties of which can change significantly with an increase in the ripple frequency of the rectified current.
Such an adapter is connected to the bike generator using a plug connector (for example, from an old radio). To the player - through its power compartment thanks to self-made tips - substitutes for a set of galvanic cells.
Intensive year-long operation of the modified on-board electrical network with a full-wave adapter showed: the player connected to it works fine, starting from a bicycle speed of 5 km / h (the headlight is de-energized). However, when turning on the electric lighting, the speed should be at least 8-10 km / h.
Schematic diagrams of a half-wave (a) and full-wave (b) self-made rectifiers for powering the player from a bicycle generator
Replacement tips for a set of galvanic cells: 1 - wooden base; 2 - multicore mounting wire in vinyl insulation; 3 - cathode (housing-electrode "finger" galvanic cell); 4 - anode (nail 3x20 mm, preferably brass).
It turned out that the effectiveness of the on-board network is somewhat reduced in the autumn-spring thaw, as well as during rain. The reason is slippage at the point of contact of the tire with the generator rotor pulley. This is unlikely to affect the popularity of the proposed technical solution only. Indeed, with the advent of the abyss on the roads, even avid cyclists, as a rule, do not go anywhere.
Author: V.Denisov
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