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please show me how to build a laser pointer Answered


Buy a laser module, a couple of 1.5V batteries and a switch.
Put them into a tube and arrange for the switch to control power to the module.
Voila - A laser pointer.

It's really much easier and cheaper to buy one ready made.
You could build your own circuit around a laser diode, but why bother when you can buy the ready-made thing for a few {insert units of currency here}.

The flip-side of this is that if you have a laser-pointer with a broken switch (I've had a couple) you can recover a useful laser module from it if you're careful.

You buy them.
Or would you refine the question to something more specific?