In this tutorial, you will learn how to activate and deactivate a relay using a push button, without relying on microcontrollers like Arduino. The circuit will be designed simply, using basic components such as a flip-flop or a 555 timer. This technique is ideal for applications where you need to control AC or DC devices manually and easily. We will explore the circuit diagram, the necessary components, and how to implement this solution in projects where turning on and off electrical loads is required without programming.
MATERIALS:
- 1 Relay
- 2 Resistors of 1k
- 1 C1 74ls90
- 1 NPN Transistor
- 1 Push Button
OPERATION:
As we can see in the video, the relay is activated with one pulse and deactivated with another; we achieve this thanks to the integrated circuit 74LS90, which is a counter that goes from "0" to "9" (0, 1, 2, 3, 4, 5, 6, 7, 8, 9). To make it count, we send a logical 0 to pin 14 of the 74LS90.
The function of the transistor is as a switch; we connect it to pin 12 (Q0) because, as you can see in the truth table, we have alternating 0s and 1s, so the relay will be activated with one pulse and deactivated with another.
WIRING DIAGRAM:
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