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...
Its been more than two weeks that i am designing a new bench power supply with adjustable dual polarity and non adjustable 5V. Which includes safety fuse and LCD or 7Segment display to monitor current and voltage.. but still not decided to which to put.
The transformer used in the power supply is re wound to make it center tap. Before it has only one coil in secondary so i disassemble the transformer and re wound it again for my needs.
The rectifiers are circuit's taken from a computer power supply from junk. The diodes in the rectifier is high current diodes so i planed to cut the part out from a power supply.
For variable +15V i used LM317 and for -15V i use LM337. Still i am waiting for my component orders. Once 5K VR arrives i will finish this project.
The transformer used in the power supply is re wound to make it center tap. Before it has only one coil in secondary so i disassemble the transformer and re wound it again for my needs.
The rectifiers are circuit's taken from a computer power supply from junk. The diodes in the rectifier is high current diodes so i planed to cut the part out from a power supply.
For variable +15V i used LM317 and for -15V i use LM337. Still i am waiting for my component orders. Once 5K VR arrives i will finish this project.
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