Recent content by Galoot44

"corrodes over time" isn't a huge concern for me but if you have a correction to make to the circuit I would welcome it. I'm going to build this, take a video of it working to put on LinkedIn, then take it apart.

OK, I gave away my copy of Horowitz and Hill so my reference source for op-amps is no longer available. So I have no idea.

The feedback has no resistor! It goes straight from the output to the negative input of U3. Weird.

No image of the circuit Test points make perfect sense, thank you! This is going to be a really fun project to build.

I talked to the colleague who did this years ago--he confirmed that he used a grid scan, not PID. So I'll do that. For my PID project I'm going to control a thermo-electric cooler but with op amps instead of an arduino. There is a good guide here...

I haven't selected a sensor yet, probably a simple silicon photodiode run in PV mode. And no I won't correct the focal length. I might do what you suggest and do a grid scan and analyze that as you suggested. No PID needed in that case.

Two stepper motors that came with my Arduino Uno kits. I have done very little with feedback and control. I'm taking a Udemy course on PID control that a colleague recommended: https://www.udemy.com/course/pid-control-with-arduino/learn/lecture/10009562#overview Dithering? I'm somewhat familiar...

I'm trying to get back to doing engineering work and I want to make an optical alignment jig and put the project on my LinkedIn page. I want to have a small spherical mirror focus light from an LED onto a silicon detector. I'd like to try using PID to make it work quickly. When I read about PID...