Hacked pulsed laser driver using Arduino

  • Thread starter Thread starter neanderthalphysics
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    Arduino Laser
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The discussion focuses on hacking a 5mW laser pointer to pulse using an Arduino, with initial attempts involving an NPN transistor that failed to power the laser. Participants suggest using a MOSFET instead due to voltage drop issues with the NPN transistor and discuss the importance of proper circuit connections, including the emitter-collector configuration. Safety concerns regarding laser use are emphasized, noting that even low-power lasers can cause eye damage and should be handled with caution. The conversation also touches on the differences between transistors and MOSFETs, particularly regarding their operational principles and voltage drops. Overall, the thread highlights troubleshooting steps and safety considerations in working with laser technology.
  • #31
OK, how would you improve it?
 
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  • #32
How to use a transistor to drive an LED

Your circuit only works because the series impedance of the battery is high. If you put that on a strong enough battery you would instantly explode the transistor.

BoB
 
  • #33
Thanks for the article. It is very readable and explains basic concepts which I have forgotten from my mammoth hunting classes.
 
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