1. Home
  2. Electronics Design
  3. Laser Diode Modulation Help

Laser Diode Modulation Help

Hello, I work with laser show systems and visible wavelength 5.6mm diodes such as

650nm & 405nm. I need a driver for powering these diodes up to 1amp, and has analog modulation (5v input) for connecting to ILDA controllers. My last source for these has been out of stock forever, so I would like to build my own if possible to keep cost low and not worry about availability.

Here is what I used to get:

formatting link

Can someone help with a schematic and parts list? I sincerely appreciate any help :) J

--------------------------------------- Posted through

formatting link

Reply to
jwolf
Loading thread data ...

On a sunny day (Wed, 28 Jul 2010 12:28:10 -0500) it happened "jwolf" wrote in :

I dunno, maybe like this?

+12V ------------------------------------------------ + | | | | Laser -- | | | |--- Q1 | ________________ - in [ ]| FET | | | 100k |--- |/ Q2 |/ Q3 ---| gain |------| -----| | | |\/ | |\/ NPN power | |10k |--- | | [ ]
Reply to
Jan Panteltje

On a sunny day (Wed, 28 Jul 2010 12:28:10 -0500) it happened "jwolf" wrote in :

I dunno, maybe like this?

It actually could work, here a spice simulation with real component values, ftp://panteltje.com/pub/laser_supply.gif I replaced the laser diode with some Schotky, and the pots with fixed resitors. You still will need the pots. The green curve is the output in the diode. The blue curve the input voltage (100kKz).

+12V ------------------------------------------------ + | | | | Laser -- | | | |--- Q1 | ________________ - in [ ]| FET | | | 100k |--- |/ Q2 |/ Q3 ---| gain |------| -----| | | |\/ | |\/ NPN power | |10k |--- | | [ ]
Reply to
Jan Panteltje

On a sunny day (Wed, 28 Jul 2010 12:28:10 -0500) it happened "jwolf" wrote in :

The simpler and better MOSFET output version: ftp://panteltje.com/pub/laser_supply2.gif R4 still needs to be a pot (bias).

Reply to
Jan Panteltje

ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.