Don't try this at home - a blue LED connected directly to a 9v battery without a current limiting resistor burns out quickly - it could easily explode so watch out. But you can connect a blue, white or UV LED directly to a CR2032 lithium coin cell safely as a quick LED self test. If you look inside those cheap LED keyring torches, this is exactly how it's done.
By Julian
Youtuber, shed dweller, solar charge controller aficionado
Excellent
good video thanks.
Is there a way to connect a botton battery with a switch control(on/off) and a led?
9v seems overkill for the small led, no?
👍
Next up: clock radio dies rapidly at 1 kV but OK on 240 V AC.
This video is old. (this comment written June22.2018) Is it possible to make a wire less/hidden led stick to the side of your temple on your head like the Androids in "Detroit Become Human"? I hope to get an answer before San Diego Comic Con 2018. Hopefully, if not, then it's cool.
My blue led works on a 9v
Very nice, I didn't know LEDs have a nonlinear region, good to know for my projects since I use LEDs to limit the voltage when I charge batteries
Very nice, I didn't know LEDs have a nonlinear region, good to know for my projects since I use LEDs to limit the voltage when I charge batteries
red and green LED works perfectly with 3v cell
resistor
you're burning it out, brah…
but the led will work strongest with high current and volt how for it doesn't too much.if you use 9v 200mw battery,so connect two leds sequence.if you use 3v 3w,so connect the leds parallel and it also work with high bright.
what is the maximum current of standard LED… .. ?.. LED like in this video….