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https://hoursfinder.com/0-9-hours/555-timer-24-hours.html
This circuit here, “24-Hour Digital Clock and Timer Circuit” is a simple circuit with two different applications as per reflected through the name 24-hour clock and a timer. 555 Timer Tutorial - The Monostable Multivibrator
https://www.youtube.com/watch?v=UJz2Tnc6clU
Part 1 of a 3 section series on how to build and test a 24 hour clock using TTL logic, a 555 timer and 7 segment displays. Retro style!!
https://www.hobbyprojects.com/timing_timer_circuits/24_hour_timer_circuit.html
24 Hour Timer Circuit and Tutorial - A timer circuit with independent mark and space periods. A simple astable timer made with the 555, the mark (on) and space (off) values may be set independently. The timing chain consists of resistors Ra, Rb and capacitor Ct. The capacitor, Ct charges via Ra which is in series with the 1N4148 diode.
https://electronics.stackexchange.com/questions/135132/555-timer-how-to-set-values-to-take-an-hour
What you ask for is not something a R-C timer like the 555 can do. The problem is that for such long times, the current to charge or discharge the cap is so small that leakage currents dominate. Making 1/2 second pulse every hour is something a microcontroller can do easily. Even the simplest, the PIC 10F200 can do this.
https://www.jameco.com/Jameco/workshop/TechTip/555-timer-tutorial.html
Figure 8: 555 timer in Astable mode. As shown in figure 8, grounding the Reset pin (4) stops the oscillator and sets the output to low. Returning the Reset pin to high restarts the oscillator. Calculating the period, frequency and duty cycle Figure 9 shows 1 complete cycle of a square wave generated by a 555 astable circuit.
https://www.electronics-tutorials.ws/waveforms/555-circuits-part-1.html
The two 555 timers within the 556 operate independently of each other but share a common V CC supply and ground (0V) connection. The standard TTL 555 can operate from a supply voltage between 4.5 volts and 18 volts, with its output voltage approximately 2 volts lower than its supply voltage V CC. The 555 can source or sink a maximum output current of 200mA, …
http://www.learningaboutelectronics.com/Articles/555-timer-clock-circuit.php
This 555 timer is in astable mode. Astable mode can produce digital square waveforms that go back and forth between HIGH and LOW. So we have a signal with a frequency of about 60Hz. You must realize with tolerances that resistors have, it may fluctuate a little above or below this level. And this is how clock pulses can be created with a 555 timer.
https://www.homemade-circuits.com/how-to-make-simple-timer-circuit-using/
IC 555 adjustable timer explained here can be adjusted from any time delay 1 second to 3 hours for operating any load through a relay control. The produced time delay is fully adjustable and the user has the freedom to set the time period as desired. There are many ways of making simple timer circuits using different ICs and discrete components; here we discuss …
https://circuitdigest.com/electronic-circuits/1-minute-timer-circuit
555 Timer IC is not reliable for timers, greater then 10-15 minutes, you should check out IC 4060B for larger duration like 24 hours.
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