bigclive
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Very minimalist rechargeable flashlight
🕑 Added 2024-04-22 02:14:56 +0000 UTCThe most interesting things about this rechargeable light are its physical construction and very low component count.
The charging circuitry is similar to some solar lights and shavers I've looked at, so I'm guessing it may be actual dedicated charge circuitry built into a microcontroller, or perhaps just implemented in software.
Comments
Big Clive
That's a very retro tungsten-style. I bet it flickers in use due to contact issues.
John Harrison
I was in Spain last week and saw this green lamp have a quick look how simple it was made it was 5 euro - the first few images at the top. Ignore the frozen snack in the freezer https://photos.app.goo.gl/HNrlzJlEWwOdld0h2
Big Clive
Yes. I'm not a fan of microcontrollers controlling charging. I'm not sure if the chip has a fixed shunt device on that pin to cap base voltage relevant to the lithium cell voltage present at its emitter.
Andreas Schuderer
Isn’t a lot of faith put into the uC here regarding the charging circuit? I‘m an electronics beginner, but the pullup R in the base of the transistor in emitter follower configuration would mean athat if the uC is dead, we get USB‘s full 5V on the lithium ion battery. I am probably overlooking something but would be interested in whether that’s true or not
