These are many Monostable multivibrators using 555 timers. We use them as timer circuits to control a load. For example, LEDs, or driver relay. Which trigger them by a normal switch. Please look at more below. I hope you are happy!
Here is the circuits diagram you can make that.
1. Simple 555 timer with LED display
2. Basic Timer Control circuit using NE555
3. 555 IC Timer control relay Switch
4. Egg timer circuits using IC-555
The 555 is good at making the timer. We often call it, 555 timers. It may be unique features of 555.
It is very easy to use. Just add a resistor and capacitor each one.
We so get a simple timer that can set the time as you want.
In the circuit below, take the 555 in the monostable multivibrator or the time delay circuit. It has the operation status of 2 level. First, low voltage (logic “0”). Second, high voltage (logic “1”).
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Simple 555 timer with LED display
In the circuit above. When press the switch S1. Pin 2 of IC-555 will be shorted to the ground. It is the trigger for IC-555 to active with the low voltage or logic “0”.
Then, the output pin 3 of IC gives the high voltage. It is the same as the power supply voltage. So it makes LED1 glow up to show the time working.
This time can be set by changing the value of R2, C1, and VR1.
Below is a simple math equation. For those who want to calculate the right time.
Time = 1.1 R2 x VR1 x C1
Also, You can set this time easily by adjusting the VR1.
Basic Timer Control circuit using NE555
As circuit below, we use LED display to show the timer circuit. But if we need to use others load. For example, lamps, motors, and more. In principle, the maximum current output of LM555 is about 200mA.
It has many ways to drive the high current load. First, using transistors, easy and cheap. But it cannot use with AC load. Using relay is the best way we like at all time. IC555 can drive the relay directly without helping of a transistor. So easy and useful.
In the circuit above, to begin with, Press the pushbutton switch-S1 just a brief moment. To start the Timing Cycle. The relay will be pulled in. The current flow to the load. Until finishing the timing delay. The relay does not work.
R1 and C1 control the delay time. If more capacitance of C1, more time. It is same as above circuit. This circuit also responds to a logic pulse. Have fun with this simple timer circuit.
555 IC Timer control relay Switch
This circuit is similar to the second. It is another idea of 555 timers with a relay switch.
Egg timer circuits using IC-555
This is mini timer circuit that interesting. It is called the Egg Timer circuit. Also, I use The famous 555 IC, LM555 or NE555 or equivalent. Using VR1 to adjust the timing of the egg timer.
The S1 is a selector switch.
First, set S1 to “standby”. Pin 2 of IC open up. IC does not work. The buzzer will be silent. While the current flows R1 to charges in C1.
Second, set S1 to “time”. In briefly, C1 discharged, Pin 2 closed to turns IC-555 on. The buzzer will be silent until the delay is complete. Then, the buzzer will emit alert us immediately.
Increase C2 or VR1, R2 for longer delays.
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