 |
| 24 hour timer Circuit design |
Electronic Timers are widely used in many gadgets and have limitless application in our daily life. You might have come across several timer electronic circuits which is capable of producing short time delay. The above shown electronic design capable of producing delay up to 24 hours so that it can be employed in numerous ways such as alarms, device activators etc. This circuit diagram shows it was built around an IC 4060. Let us move into working explanation of this circuit.
IC 4060:
 |
| PIn diagram of IC CD4060 |
IC 4060 is a formidable integrated circuit especially used for timing and oscillation purpose. It consists of ten active high outputs that can produce desired time delay from few seconds to hours. IC 4060 is a oscillator binary counter cum frequency divider. This Integrated circuit also has a inbuilt oscillator which is purely based on three inverters. The frequency of the internal oscillator is determined by the value of resistors and capacitors connected with it.
WORKING OF CIRCUIT:
This timer works by means of inbuilt oscillator which was wired to produce a signal of specific frequency. When the oscillator is running the counter counts the number of oscillations and it is reflected in the output pins of the Integrated circuit 4060.
RV1 a variable pot was used to alter the frequency of the oscillator, so we can control the speed of count. To be exact by controlling the speed count we can decide the time duration it will take for any given output pin to go high. And from that output pin you can switch your transistor to turn on the relay or activate any device using it.
 |
| Range Table Setup Table |
The above table illustrates the time delay output obtained from each of the pins in the IC 4060. Using this table and performing simple math can help you obtain any time delay of your desire. For example if you want a delay of period 9 hours , the range table shows that it can be obtained from pin 2 of the IC.
The pin 2 need to go high after 9 x 60 x60 = 32400 seconds and setup table tells you to divide this 512. This will give 63 seconds, all you need to do now is to adjust RV1 in such a way the LED1 lights 63 seconds after power is applied. This will give an output at pin 2 after about 9 hours, your desired time delay.
The diode D2 was used above to disable the oscillator once the output becomes high. Omit the Diode D2 to use this timer circuit in the repeating mode. Leaving the D2 will carry on the count indefinitely and the transistor will turn on and off at the same regular time intervals. Implement it in a PCB after proper designing and relay should be handled with care.
ATTRIBUTION: Zen22142
Like this circuit? Share this with others through social sites and dont forget to follow us there. Have one of your self designed circuit design with you? You can publish it in our site follow this Link to do so. Post your queries below, we are happy to help you. Thank you for visiting and Enjoy Electronics.
