Need advice for ir laser diode driver FAST

[protocol217]

i need a driver for infrared laser diode from cd drive, will this driver work:

or this one: **broken link removed**
or if someone have a better driver for infrared laser diodes from cd drives please give me.
i am aware of infrared danger, i will use it with caution.
i need an answer as soon as possible, thanks in advance.

 

[ronsimpson]

I did not check to see if the current is right for you laser diode.
Other wise it looks good to me.

 

[protocol217]

the laser diode is from cd drive it is infrared 7xx nm wavelength don't know exactly, and i don't know the current recurred for my laser diode. you meant on the first driver from youtube right ?
that one works with regular red laser diodes from dvd burners

 

[ronv]

If your laser is from a read only cd drive it is probably 2 mw max so I would use maybe 15 ohms instead of 4. If it is from a writable drive maybe 7 mw, so the 4 ohm is ok.

 

[protocol217]

there are two drivers that i linked in the first post, one on youtube - has a potentiometer on it, and one on the picture without a potentiometer which one is better?

 

[Nigel Goodwin]

there are two drivers that i linked in the first post, one on youtube - has a potentiometer on it, and one on the picture without a potentiometer which one is better?

They are both essentially the same circuit, the one with the pot allows you to adjust the power though.

 

[protocol217]

I will build the one with the potentiometer and turn down the output current an then slowly turn up until i get what i need.
Already ordering the parts, will report back the results.

 

[protocol217]

and that circuit with a pot requires 9 volt battery, can i use lower input voltage like 7,4 volts (two lithium 3,7 volts ) or even one 3,7 volt battery ??
also is the infrared diodes from cd drives pinout same as red ones from dvd drives?

here is the red laser diode pinout:
**broken link removed**

 

[Dick Cappels]

This one is pretty fast, certainly faster than one based on the LM317.

http://www.cappels.org/dproj/ledsw/Fast_LED_Driver.html

**broken link removed**

You can change the current range by changing R9.

 

[protocol217]

thanks, but i think i will go with the LM317, because i already ordered the parts, and don't have parts for the one you suggested right now,
only thing i need now is the cddrive ir laser diode PINOUT which one is positive and which is negative pin ?

 

[protocol217]

i made that driver with potentiometer, works perfectly with infrared laser diodes. the potentiometer is on 70-80% of power and it is very bright dot,
on 100 meters it a bit large like 10 cm circle. i run it from two 3,7 volts battery.
now i wonder for how long the diode will last with this configuration?

 

[Dick Cappels]

Well...let's hope your don't experimentally determine that too soon