How is this possible? laser emmits light with no power going through.

[Bionic-Badger]

Ever touch the signal lead of an oscilloscope to your body? It'll register a signal. Even multimeters will pick up a reading. Just make sure you don't use this fact against your interests and fry one of your components.

 

[Leodahsan]

@BB
Yeah I know, I just didn't know that a low voltage (~4v) would conduct thru my body. It was a interesting experience anyways
Thanks again dude.

 

[GBD]

Ever touch the signal lead of an oscilloscope to your body? It'll register a signal. Even multimeters will pick up a reading. Just make sure you don't use this fact against your interests and fry one of your components.

hmm.. true enough.
When I touch mine it causes this mess of a waveform:

I wonder though how a few hundred millivolts at almost no current will cause a diode to glow though. I thought LDs had certain thresholds that needed to be met in order to cause them to emit any light?

 

[Leodahsan]

Hmm, with the VCC connected I think it should be possible ...