Friday, April 14, 2017

Circuit Schematic Diagram Simple Pulse Generator using SN74121 IC

ElcoHow. - This is one circuit schematic diagram of simple pulse generator using the ain component SN74121 IC that very useful for you who want to build pulse wave source for your project.

In this time, we will give you global description about this Simple Pulse Generator using SN74121 IC like in Figure 1 below, beside we give you circuit schematic diagram and component parts used in this circuit.

Circuit Schematic Diagram

Component Parts

  1. 1 10 µs to 100 µs
  2. 2 100 µs to 1 ms
  3. 3 1 ms to 10 ms
  4. 4 10ms to 100 ms
  5. R1 = 33 Ω
  6. R2 = 47 K Ω
  7. R3 = 47 Ω
  8. R4 = 33 Ω
  9. R5 = 2.7 KΩ
  10. VR1 = 1 MΩ LOG
  11. VR2 = 47 KΩ LIN POT.
  12. C1 = 1 µF/16V
  13. C2 = 0.0022 µF
  14. C3 = 0.022 µF
  15. C4 = 0.22 µF
  16. C5 = 2.2 µF/16v
  17. T1 = SL100
  18. T2 = SK100
  19. IC1 = 74121
  20. SW1 = 1 pole 4 way switch


This is circuit schematic diagram of Simple Pulse Generator using SN74121 IC that can help you to build pulse wave generator. The main component in this circuit is monostable multivibrator with schmitt-trigger. 

According Electronicsproject site that also published this circuit is used to provide positive going pulses. The pulse width varies from 10µs to 100 ms at the rate of 20 pulses per second to 1 pulse per second and adjusted by a 1 MΩ potentiometer. Transistor T1 and T2 form a relaxation oscillatory circuitry. The frequency of oscillation depends on C1 and VR1. The pulse width is varied by a 47KΩ (VR2) potentiometer. Any required pulse width range is selected by the switch SW1.

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