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Laser sight gun

kalshagar - Laser sight gun

Toy gun with laser sight

The other day I spotted a plastic dart gun at the 100 JPY shop, big model "magnum" they said. It works surprisingly fine and shoots accurately at 4 meters range.
And there the geek kicks in : reminds me I bought a dozen of red laser diodes for 5 usd a few months ago, got some 5.1v Zener diodes too, a few second hand CR2032 Li-Ion coin battery, a simple contact switch from a DVD, 1 hour to spare... see where this is going?
Simplest circuit, using a Zener diode for voltage regulator to limit voltage at 5.1v (got a 7v from the stacked 2 coin cell battery).
20131222_235052.jpg
① poor man 2x coin cell ② Zener diode ③ the tact switch is on the outside of the gun ④ the 5v laser diode
lasergunschema.png
Notice the Zener in revert position, that's because you want the Zener effect to guarantee you a 5.1V
All content on this site is shared under the MIT licence (do what u want, don't sue me, hat tip appreciated)
electrogeek.cc ~ Formerly known as Kalshagar.wikispaces.com (AlanFromJapan [2009 - 2017])