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I added a start button so people don't have to throw their phones to get it to work, the button isn't real or needed in the actual circuit. This is the final circuit I threw together to control an array of four wire pc fans. I wrote a whole paragraph on special things to look for if its not working for you but everycircuit crashed so thats only going to happen again if someone needs a hand. Anyway, what I'm posting is the REAL WORLD circuit. It functions perfectly for me with these values so take that for what its worth before you look at the simulation and decide to make it "perfect". ie de-troubleshoot. This worked ruggedly on a breadboard with long, unkempt jumpers so I have full faith that the operation will hold over to the protoboard and final housing. The circuit has ran without issue in max on, idle, and mid range for several hours each. It showed excellent rpm stability in an arbitrarily chosen mid range rpm over most of its expected temperature range, and more than acceptable rpm stability over extreme hot and cold well outside of its expected normals. Just for the hell of it I blasted it with 10w of hand focused UV and it didn't give a shit about that either. In my particular application it will be in a sealed, grounded metal box so I'm not going to test it for resilience to local high freq or high voltage.
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