Buying player, conceived to adapt to power it during his frequent bike-Board generator. As adapter decided use a self-made semiconductor rectifier. Implementation ideas started by choosing the principal circuit diagram of unidirectional valve on the diode with a smoothing capacitor. She soon found out: a staff Wellenreiter capacity 3-5,4 watts and output voltage In 6-7 and modified side the grid using the rectifier is basically key any diode average power and capacitor 500-2200 UF copes with new task. In the end, the player was to receive a 3 volt power supply when driving bike at a speed over 10 km/h with the included headlight and not less than 8 km/h with de-energized.
A more complex design that have significantly improved the former performance, too, was made by the classical scheme, but with the "extra" diode VD5. Its purpose - when riding at high speed to prevent closing the circuit through the electrolytic capacitor, properties with the increase in the frequency of the pulsations of the rectified current can significantly to change.
To Wellenreiter such an adapter is connected via a plug / socket connector (for example, from an old radio). To the player is through the battery compartment thanks to homemade tips - substitutes electroplating kit elements.
Intensive year-long operation of the modified electrical with full-wave adapter showed connected to it player perfectly works, starting from the speed of the bike 5 km/h (headlight de-energized). However, when I enable lighting speed should be at least 8-10 km/h.
A circuit diagram of half-wave and full-wave (b) improvised rectifiers to power the player from velehentor
Tips replacement set of battery cells: 1 - wooden base; 2 - stranded mounting wire with vinyl insulation; 3 - cathode (case-electrode "AA" cells); 4 - anode (nail 3x20 mm, preferably brass).
It was found that the efficiency of the onboard network is somewhat reduced in fall and spring thaw, and in the rain. The reason for the slippage in the point of contact of the tire with the pulley of the generator rotor. Only on the popularity the proposed technical solution is unlikely to affect. After all, with the advent of the abyss on the roads even avid cyclists, as a rule, never travel.
Author: V. Denisov