Simple On-bike Power Supply

5 V from muscle power

Thirteen years into the new millennium, people no longer take printed maps on cycling trips. A smartphone suffices! However, with power for recharging the phone seldom close to hand, a 5 V supply on board the bike would be extremely useful. This article shows just how easy this is to provide.The day is close when your bicycle will provide an energy source for all those electronic gadgets you take with you.

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Materials

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120600-PCB.pdf

Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.

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PCB

Download Gerber file: 120600-1.zip

Component list

COMPONENT LIST
Resistors
R1 = 1kOhm
Capacitors
C1 = 1000µF 35V, 5mm pitch, 10 mm diam.
C2 = 100µF 35V, 2.5mm pitch, 6 mm diam.
C3 = 10µF 16V, 2.5mm pitch, 5mm diam.
Semiconductors
D1 = 24V 1W zener diode
D2–D5 = 1N5817 or SB140*
IC1 = BA05CC0T (LDO, 1A, TO220 case)*
LED1 = LED, green, 5mm
Miscellaneous
K1,K2,K3 = 2-way PCB screw terminal block, 5mm pitch
S1 = switch, DPDT, 24V 1A
PCB # 120600-1
Suitable plastic housing and connection clamps
* see text