Using 3 NPN transistors, 3 capacitors to make and control LED blinking

Arduino & Electronics Leave a comment

This post is about making and controlling LED blinking. The schematic and demo video, as per below.

The battery source is 9V.

To reiterate a few points which is stated in the image above:

  • The original value of C3 is 220uF. I change it to 1uF. Circuit design taken from ‘Make: Electronics 2nd edition’. A fantastic book for electronics hobbyist.
  • Reduce C1 and C2 value to increase blinking rate.
  • Increase C1 and C2 values to reduce blinking rate.
  • Lopsided C1 and C2 values (C1>C2 or C2>C1) to create different rate for ‘On’ and ‘Off’.

A short demo video: