Welcome to Laser Pointer Forums - discuss green laser pointers, blue laser pointers, and all types of lasers

LPF Donation via Stripe | LPF Donation - Other Methods

Links below open in new window

ArcticMyst Security by Avery

Laser with throttle capabilities

Joined
Sep 12, 2007
Messages
9,399
Points
113
You'd also want to put the pass transistor on the other side of the laser diode. It would work as-is if you had 12V input maybe, but it's best practice to put NPNs on the "low side" when possible.
 





Joined
Jul 6, 2016
Messages
6
Points
0
You'd also want to put the pass transistor on the other side of the laser diode. It would work as-is if you had 12V input maybe, but it's best practice to put NPNs on the "low side" when possible.

Cool, I noticed a few schematics on-line my way buy most were the other way. I guess coming from a software engineering background I think "vary the high side and hold the ground 'constant'". But in reality it doesn't matter whether the high or low side if the LD is changed.
 
Joined
Sep 12, 2007
Messages
9,399
Points
113
You can have high-side regulation instead, but a PNP/P-MOS is better suited.
 




Top