I'm open to correction on this, but is the monitor photodiode not there to = provide feedback to the driver circuit? As far as I know things can go wron= g easily if you don't have this. At the very least, output will be very var= iable. Any diodes I've used have this built into the package. Joe -----Original Message----- From: piclist-bounces@mit.edu On Behalf Of David = Van Horn Sent: Thursday 6 September 2018 00:23 To: Microcontroller discussion list - Public. Subject: RE: [EE] Laser diode sources Lifetime, at least hundreds of hours power on. Temperature, -20 to 40C No monitor needed.=20 Visible red, no particular wavelength though shorter is better. -----Original Message----- From: piclist-bounces@mit.edu On Behalf Of Bob Bl= ick Sent: Wednesday, September 5, 2018 5:05 PM To: Microcontroller discussion list - Public. Subject: Re: [EE] Laser diode sources Hi David, What sort of lifetime, what temperature range, and do you need it to have a= monitor photodiode? Friendly regards, Bob ________________________________________ From: piclist-bounces@mit.edu on behalf of David = Van Horn Sent: Wednesday, September 5, 2018 8:52 AM To: piclist@mit.edu Subject: [EE] Laser diode sources I just looked on Digikey for Laser diodes, and the least expensive I could = find, was about $5 in Q 50,000! Where can I source small, very inexpensive visible laser diodes? 1 to 5 mW= would be fine. No other particular requirements. I might even go as far as bare chips for a COB design. -- http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/chang= e your membership options at http://mailman.mit.edu/mailman/listinfo/piclis= t -- http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/chang= e your membership options at http://mailman.mit.edu/mailman/listinfo/piclis= t --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .