These little guys are pretty decent…
These little guys are pretty decent laser diodes! They’re super bright and fairly inexpensive. While I think they have a resistor built into the driver I’m driving them at about 4.5V with a 100Ω resistor in series with the device. I noticed that these are focusable. You can twist the collar near the output side to focus the dot. Yes, laser diodes don’t have a perfectly round dot, but when focused properly, you really can’t tell by eye over short distances. They work great.








