Understanding Sunbeam 3-Hour Timer Circuit

The sunbeam 3-hour timer circuit is a simple yet effective way to create a timing device that can be used in various applications. The circuit uses an IC 555 timer, which is a popular choice for timing applications due to its reliability and ease of use.

In this article, we will explore the components needed and the explanation behind the circuit diagram. We will also discuss how to adjust the values of the resistor R1 to get varying times.

Circuit Diagram

The circuit diagram above shows the IC 555 timer circuit in a mono-stable mode. This means that it starts timing when you power the circuit, and the timing period can be adjusted by changing the values of the resistors R1, R2, and VR1.

Components Needed

To build this circuit, you will need the following components:

* IC 555 timer

* Resistors (5KΩ, R1, R2)

* Capacitor (1uF)

* Variable resistor

* Switch (reset switch S1)

Circuit Explanation

The circuit works by creating a voltage divider at pins 1 and 8 using three 5KΩ resistors. This creates a stable timing signal that can be adjusted by changing the values of the resistors.

To change the oscillator's period, you need to adjust the values of R1, R2, and VR1. The total resistance to pin 10 should be ten times less than the value of the resistor to pin 11.

Reset Switch

The circuit also includes a reset switch S1 that allows you to turn off the timer and start the oscillations all over again. This is useful if you need to reset the timer or adjust its period.

Varying Times

To vary the timing period, simply adjust the values of R1, R2, and VR1. The circuit will count up to bit 14, setting pin 3 high, and the buzzer will turn on when the time is reached.

In conclusion, the sunbeam 3-hour timer circuit is a simple and effective way to create a timing device that can be used in various applications. By adjusting the values of R1, R2, and VR1, you can vary the timing period to suit your needs.

Sunbeam 3 hour timer circuit