1 KΩ


Resistor


1 KΩ


1 KΩ



2


Sketches:

  1. 4N35 Optocoupler
  2. NE556 Timer Dual
  3. Max7219 & 4 digit 7 segment display
  4. NE555P Precision Timer
  5. TCRT5000 Reflective Optical Sensor with Transistor Output