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What's the best way to add a battery like device to a dynamo light (self.askelectronics)

submitted 3 months ago by coke38 to c/[email protected]

15 comments fedilink hide all child comments

Hello everyone, I bought a bottle dynamo for my bicycle with a rear and front light. Though I have one little tweak that I would like to add and that's a way to keep it light up for about 1 minute (at least 30 sec) without pedaling. I thought of putting a capacitor in the circuit to store some energy but I would like what do you all think of it ?

Thank you for your time and have a nice day you all !

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[–] coke38 1 points 2 months ago* (last edited 2 months ago) (1 children)

What I wanted to do was something like that IMG_20240925_092655

Though you seem to have a better knowledge and better circuit. I bought 2 super cap 5.5v so I wanted to put them in series (though get half the capacitance). Your approach seems to be better and I may take it. Though mine should be working ? Keep in mind that I'm a nooby in electronics and I keep learning from the internet so not the best to have solid base...

Does your solution works with 5.5V, the 6V dynamo does not blow it ?

Thank you for your answer I really like it.

[–] tia 1 points 2 months ago (1 children)

Your solution may very well also work, good thinking. A few things to consider though:

Putting capacitors in series requires balancing them
A silicon full bridge rectifier drops ~1.4V frm the input
Incandecent bulbs require a lot of current to get going, this may result in a delay for them to turn on

[–] coke38 1 points 2 months ago

Ok, I forgot the voltage drop =\ I got LED light so should be fine. What I should do is put your circuit to the test without the capacitor and check if the voltage is low enough for the capacitor to handle ? How should I balance the capacitors ? (Even if I will not take this path, I would like to know)

Thanks again for your help