Custom ESP32-S3 development board — professionally manufactured by JLCPCB. A far cry from where it all started. It Started in a School Science Lab — Around 1998 Most people who get into electronics start with a kit, a tutorial, maybe a breadboard and some LEDs. I started by sneaking ferric chloride out of a school science lab to etch my first PCB. That was around 1998. I was living in the Maldives — a small island nation in the Indian Ocean — where there was no electronics supply chain, no maker community, no local PCB fab. Just a chemistry cabinet at school, a copper-clad board from somewhere, and a lot of curiosity. This post is about what the next 25+ years of PCB prototyping looked like from there. The early wins with proper chemicals, the years of improvisation when those chemicals disappeared, the real injuries, the failed boards, and finally — the moment JLCPCB changed ever...
This circuit basically goes to PWM (Pulse Width Modulation). From this circuit i controlled a PC power supply fan. when the variable resistor is turned, the fan starts operating in a very slow speed and when the VR is turned more the speed of the fan increases. If you want you can just modify this circuit and use and temperature sensor and trigger the fan to cool the system. If you guys need the schematics for modifications, i can give it..
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