Automated Single Digit 7-Segment Display with 555 timer as clock

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This is a digital circuit made without a controller.

Component List:

  1. 555 Timer
  2. 4-bit Binary Up-Counter (74LS193 IC)
  3. BCD to 7- Segment display (CD4543B IC)
  4. Common Anode 7- Segment display
  5. Resistors
  6. Diodes
  7. Capacitor
  8. 9V Battery
  9. 7805 Regulator (9V to 5V Converter)




Working:

Astable 555 Timer is used as a clock with frequency of 0.5 Hz for the binary Synchronous counter.

T= 1/f  = 1/ 0.5 = 2 Sec

Ttotal = Ton + Toff = 2 sec

As the 555 timer is configured to have independent ON and OFF time, both Ton and Toff are made to have the same timing (1 Sec).

Ton = Toff = 0.6932 * 15k * 100uF = 1 Sec

The 4-bit binary counter output is given to BCD to 7-Segment converter, Which is then connected to the display via resistors. The single digit 7-segment display refresh almost every 2 seconds (with some additional propagation delay).

Circuit diagram:


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