Last week I built my own variable power supply in class using the schematic below. Today we checked to see that it’s working.

It did!!!

bac-power-supply
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Then I made this circuit using the LM555 Timer Chip that has been around for the past 60 years and many applications, and created a blinking LED circuit without any code 🙂 pretty sweet to see it working this way.

The circuit from up close:

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The Schematic:

555_led_flasher

LM555

555fig1

The components:

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