laser diode

[decoevvblog]

Hi,
I wanted some help kindly

can i use the same digital potentiometer for 9 laser diode?

obviously I will have a single setting for all 9...

[moffy]

The connection of LD1 is curious, especially what I assume is the photodetector connection to ground? Yes you can use the same output from the digital potentiometer to drive other laser diodes via the LM324, as the +ve input is relatively high impedance, the most you would need to worry about is input bias currents into the LM324s creating an offset in the digital pot.

[NiHaoMike]

Put a 100k or so pulldown on the noninverting input of the opamp to ground, so that a bad connection won't cause it to go to max current from bias current.