Delay Off Timer Circuit Diagram. In this post we discuss the making of simple delay timers using very ordinary components like transistors capacitors and diodes. Timer circuit for automatic switch off any appliance after a fix time duration.
Timer circuit for automatic switch off any appliance after a fix time duration. In this post we discuss the making of simple delay timers using very ordinary components like transistors capacitors and diodes. When switch s1 is pressed then output will give high signal at pin 3 and transistor is on therefore the connected load with relay is also switched on.
When switch s1 is pressed then output will give high signal at pin 3 and transistor is on therefore the connected load with relay is also switched on.
The time delay of the circuit can be increase or decrease by increasing or decreasing the value of 470uf capacitor. Simple timer circuit diagram the figure 1 shows a very simple timer that will activate the relay for around 45 seconds after pressing the push button s1. Here we have used 9 v battery and 5v optional relay for switching the ac load. Time period can be calculated using formula t r1 r2 c1 seconds when pot is maximum r is 120k 1 1m 1 2m approximately and c1 470uf.
