A LED blinking could be a silly stuff, but it's a good beginning for any electronic hobbyists to start with, circuit designing, PCB soldering and testing.
A fully tested board I made for high school students class.
Soldering Side coated with clear acrylic paint
As an electronics technical teacher, I made a LED blinking board with a dual-color LED for my high school students to play with. I removed many big dual-color LED from an old-school gaming box. They last at least 15 years old, but they still work well.
Many dual-color Red Green LED I removed from an old-school gaming console
I have drawn a circuit and making a simulation in Proteus 8, before the designing and making a physical PCB.
Schematic Diagram
A capacitor C2 of 47 micro Farads and a POT RV1 of 10 kOhm are the component of adjusting the frequency of the oscillator. C2 is fixed, thus RV1 adjust the frequency or the blinking rate of the LED.
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