A very basic 555 timer-based PCB where pressing a button activates an LED. Submission to HackClub Solder YSWS ...

Making a precision programmable current sink by floating the long-forgotten anode pin of the TL431 voltage regulator.

[Kerry] decided to use the venerable 555 timer as an astable oscillator. He wired a momentary button in parallel with the left mouse button. A 50k mini pot used as the discharge resistor allows ...

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