Disassembly of Bicycle Solar Tail Light

dcexpert

Disassembly of Bicycle Solar Tail Light [Copy link]

 

 

I changed to riding a bicycle to work recently, and I bought a solar taillight for 5 yuan. The taillight is very small and simple, so I took it apart and analyzed it.

The complete taillight is as follows (for the sake of simplicity, the fixing seat is not photographed)

The taillight is fixed with two small screws and can be easily disassembled from the back. After disassembly, the solar panel is exposed. The solar panel is the amorphous silicon solar panel used on calculators. It has good low-light performance, but low power, with a peak value of more than 10 mA.

Remove the two screws that secure the solar panel and you can remove the solar panel as well.

On the back are two small batteries connected in series, a PCB board, a button, and two bright LEDs. The white part on the PCB is a bonding chip. When the button is pressed, it flashes slowly -> flashes quickly -> stays on -> turns off. It does not support long press function.

The battery is not disassembled, but judging from its shape and size, it seems to be a button NiMH battery used in PDAs. A single battery is 1.2V, and two batteries connected in series are 2.4V, which is just right for driving LEDs. The battery capacity is about 30-40mAH. If it stays on for a long time, it can only last for 2 hours at most, and it may last for 5 hours if it flashes slowly.

The output voltage of the solar cell is about 3V, and the battery is directly charged through a 1N5819 diode. Because the solar power is small, no charging management circuit is added.

tagetage

This is the first time I see a white binding. Usually they are black.

qwqwqw2088

The bound chip is used to power the solar panel, the button battery charging management chip

dcexpert

qwqwqw2088 posted on 2021-9-5 19:34 The bound chip is used to power the solar panel, a button battery charging management chip

The circuit does not have charging management, it is just direct diode charging. Anyway, the solar power is small, so it won't break no matter how you charge it.

eric_wang

It turns out that the structure inside is like this. At that time, I also wanted to buy this kind of solar taillight. I felt it was very environmentally friendly. Later, I bought a taillight that can change into seven colors after charging.

After I bought it, I realized that I had to take it off the bike to charge it before every ride. When I turned it on, it flashed like a marquee, which was too conspicuous.

dfwisdom

I've seen it. There's no electricity at home either. I'll take it down and have a look.

It turns out that the bull dung chip has started to be whitewashed...

w494143467

How do I press the buttons? I'm a little curious.

dcexpert

w494143467 posted on 2021-9-6 10:44 How do I press the button? I'm a little curious.

I forgot to take a picture of the back side, there is a small hole that can be pressed.

dcexpert

eric_wang posted on 2021-9-6 09:33 The original structure inside was like this. At that time, I also wanted to buy this kind of solar taillight. I felt it was very environmentally friendly. Later, I bought a taillight that can be charged and change to seven colors. ...

Solar power is more convenient. USB charging is too troublesome, and I am also worried that water will get in due to poor sealing.

The next step is to DIY a solar headlamp. The headlamp provided was stolen yesterday.

annysky2012

Those who can dismantle it are experts, amazing

baopodao

Today's products are becoming simpler and more functional. Using solar energy is convenient, but if you often ride at night, you still have to expose your bike to the sun.

Saozhi

It’s been a long time since I last rode a bicycle…before, it was just a plastic reflector.

This thing doesn't look like it can get wet.

dcexpert

baopodao posted on 2021-9-7 11:27 Today's products are becoming simpler and simpler, and the functions are pretty good. Using solar energy is convenient, but if you often ride at night, you still have to expose your bike to the sun.

It is also good to dry it in the sun, so it won't get rusty due to moisture. It is better than finding out that it has no power when you use it.

se7ens

5 bucks is already worth it

The kind of glow sticks given out at the company's annual meeting

When disassembled, it is also a cow dung core with 3 LEDs, powered by 2 LR44 button batteries.

A micro switch can also select the LED working mode, normally open, fast flash, slow flash, off

It seems that the principle is similar

Your lamp also has a solar panel and is equipped with a rechargeable NiMH battery, which is very worthwhile.

dcexpert

se7ens posted on 2021-9-7 17:31 5 yuan is already worth it. The glow stick distributed at the company's annual meeting is also a cow dung core with 3 LEDs, powered by 2 LR44 button batteries...

Nowadays, very few devices use button nickel-metal hydride batteries. Perhaps they are all stocks or disassembled devices from 10 or 20 years ago.

数码小叶

I bought a button battery at first, but later it was too expensive, so I changed to a No. 7 rechargeable battery. I don't know how long this one can light up at a time . I think it's either riding during the day or at night, so there's no chance to expose it to the sun.

dcexpert

Digital Leaf published on 2021-10-10 20:38 I bought button batteries at first, but later they were too expensive, so I changed to No. 7 rechargeable batteries. I don't know how long this can last at a time. I think, either...

I haven't measured how long it can last, there is always power.