He’d built a 555 using discrete components. While this isn’t 100% compatible with the classic 555 IC, it covers the basics pretty well, and [esalazar] gets extra-credit points for embracing ...
We do love unusual ways to use a 555. If you need to read ESR, and you have one of those ubiquitous component testers handy, they will give you a reading of ESR, among other things.
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