# 555 On Delay Timer Circuit Diagram Pdf

The 555 timer is an integrated circuit (IC) that can be used to create a variety of timing circuits. One of the most common applications for the 555 timer is to create an on-delay timer. An on-delay timer is a circuit that delays the turn-on of an output after the input is activated. This type of circuit can be used to control a variety of applications, such as turning on a light after a certain amount of time, or starting a motor after a delay.

The 555 timer is a versatile IC that can be used in a wide variety of applications. However, it is important to understand the basic operation of the 555 timer in order to use it effectively. This article will provide a detailed explanation of how to use the 555 timer to create an on-delay timer.

The 555 timer is a bistable multivibrator, which means that it can be used to create a circuit that has two stable states: on and off. The 555 timer has three terminals: trigger, reset, and output. The trigger terminal is used to start the timer, the reset terminal is used to stop the timer, and the output terminal is used to provide the output signal.

The 555 timer also has two internal capacitors: C1 and C2. These capacitors are used to set the timing of the timer. The timing of the timer is determined by the following equation:

T = 1.1 * R * C

where T is the time in seconds, R is the resistance in ohms, and C is the capacitance in farads.

To create an on-delay timer, the 555 timer must be configured in astable mode. In astable mode, the 555 timer will oscillate between the on and off states. The frequency of oscillation is determined by the following equation:

f = 1.44 / (R * C)

where f is the frequency in hertz, R is the resistance in ohms, and C is the capacitance in farads.

To create an on-delay timer, the 555 timer must be triggered by a momentary switch. When the switch is closed, the 555 timer will start to oscillate. The output of the 555 timer will be low for a period of time determined by the RC time constant. After the RC time constant has elapsed, the output of the 555 timer will go high and remain high until the switch is opened.

The following diagram shows a circuit diagram for an on-delay timer using a 555 timer:

In this circuit, the 555 timer is configured in astable mode. The timing capacitor (C1) is connected between the trigger and discharge terminals of the 555 timer. The timing resistor (R1) is connected between the positive supply voltage and the discharge terminal of the 555 timer. The output of the 555 timer is connected to the reset terminal of the 555 timer. The momentary switch is connected between the ground and the trigger terminal of the 555 timer.

When the switch is closed, the 555 timer will start to oscillate. The output of the 555 timer will be low for a period of time determined by the RC time constant. After the RC time constant has elapsed, the output of the 555 timer will go high and remain high until the switch is opened.

The following table shows the values of the components in the circuit diagram:

| Component | Value | |---|---| | R1 | 10 kΩ | | C1 | 0.01 μF | | VCC | 5 V |

The on-delay time of the circuit can be adjusted by changing the value of the timing capacitor (C1). The larger the value of C1, the longer the on-delay time will be.

The 555 timer is a versatile IC that can be used to create a variety of timing circuits. An on-delay timer is a circuit that delays the turn-on of an output after the input is activated. This type of circuit can be used

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