I'm looking for information on how to build a tiny 3v driver circuit which i can use to power a red or ir (green) diode. I'm trying to fix a few broken green pens by replacing the diode (808's from stonetek) and the driver.
The pens take 2 AAA batteries, but with the diodes needing 2.9v the dropout of a normal adjustable regulator (at over 1 volt) is probably too high and also i've not been able to get one to produce the (relatively) high current needed.
So what i'm looking for is something that can output around the 200mA at 2.9v with 3v input and is small enough to fit inside a pen/aixiz module. I'm assuming regulators are out so maybe something with op amps like the original driver only alot simpler.
I enjoy electronics tinkering so will prefer to make them myself rather then buying a pre-made driver, you can't learn anything if someone else does all the work for you
The pens take 2 AAA batteries, but with the diodes needing 2.9v the dropout of a normal adjustable regulator (at over 1 volt) is probably too high and also i've not been able to get one to produce the (relatively) high current needed.
So what i'm looking for is something that can output around the 200mA at 2.9v with 3v input and is small enough to fit inside a pen/aixiz module. I'm assuming regulators are out so maybe something with op amps like the original driver only alot simpler.
I enjoy electronics tinkering so will prefer to make them myself rather then buying a pre-made driver, you can't learn anything if someone else does all the work for you