Instructables

1.5 volt LED?

well im putting an LED to my coilgun so it would turn on when  the gun was on (lol) and i was thinking about putting it "between" the 1.5v battery and the charging circuit BUT! i found out that the f*cking LED is a 3v, I tried with all of the LEDs I have but I think non of them works with 1.5 volts
does the 1.5 volt LED actually exist? (LOL)
or, in the case that I do not find any LED like that one, how could I use the 3v one so it could turn on with 1.5v??

maybe the drawing can help...
help pls
thnks

**the circuit has a red led that lights up when the capacitors are charged, this one is just something i thought it would be nice to have to have it and tell you when its on**
**ALSO** this is just a part of the entire circuit, its not the complete circuit, right?, the drawing is just to give an idea of the led part


Picture of 1.5 volt LED?
Ussmillerco3 months ago

Ok, yes most 1 lumen solar lights use 1.5 v white LEDs. These lights only have 1 battery which is a rechargable aa or a 2/3 aa. Walmart sells their cheapest solar path light for 97 cents

alanf_452 years ago
Harbor Freight Tools sells a 50 LED rope of lights powered by a 1.2 Volt NiCd battery charged by a small solar panel.

I am looking for a 1.5 volt DC power supply to make it even simpler, hard wired.
nadav4 years ago
A 3mm RED led might work...
serafini4 years ago
I think there are two solutions: buy a 1.5 volt LED or use a Joule Thief... http://www.instructables.com/id/Make-a-Joule-Thief/
frollard4 years ago
You simply wont get a 3v led to light with 1.5v. You might get a red led (1.6-2.0v) to work, Amber is also quite low. Blue/white/green are virtually out of the question without a boost circuit. You want it as seandogue says, across the circuit, not in series with the circuit -- and that led needs a current limiting resistor or it will burn out. Lastly, check the polarity. LEDS need the correct +- hooked up.
seandogue4 years ago
1.5V is pretty low for most leds. The best you can do is look for some small (T-1/8) GaAs leds. with a low forward voltage. They can often be run down to just under 1V with a dim output (at a fractional mA current draw too!), but they're getting a bit harder to find than they once were.

ime, Red will be the most effective at running low.

You *could always drive it *across the circuit instead of in series too...your circuit is not a very effective use of electronics, imo, no offense intended. LEDs aren't designed to be inline regulating devices for charging circuits...
Re-design4 years ago

First I would put the led in parallel with the circuit.

Then you could either buy a 1.5 volt led like these at Digikey.

Or,

Build and led driver to raise the 1.5 volts up to 3 for the led.