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Circuit Description: In this door alarm/beeper circuit, a switch is used as the door sensor. When the door is closed, as per mechanical arrangement, the switch close its switch contacts as well. Now the beeper circuit built around 4011 (IC) is disabled by the logic low state at its input terminals (pins 1&12). If switch is fitted to a door - every time the door opens - the buzzer will give a short beep since the beeper is enabled by the logic high state and the speaker starts beeping. For powering the circuit, a 9V compact battery was used. For example, in an unattended shop - or reception area - the sound of the beep will alert you to the fact that you have a customer. How long the output lasts depends on the values of R3 and C1. Truth Table: 4011 IC A B F 0 0 0 0 1 0 1 0 0 1 1 1

Logic Circuits - Circuit Description

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Page 1: Logic Circuits - Circuit Description

Circuit Description:

In this door alarm/beeper circuit, a switch is used as the door sensor. When the door is

closed, as per mechanical arrangement, the switch close its switch contacts as well. Now the

beeper circuit built around 4011 (IC) is disabled by the logic low state at its input terminals (pins

1&12).

If switch is fitted to a door - every time the door opens - the buzzer will give a short beep

since the beeper is enabled by the logic high state and the speaker starts beeping. For powering

the circuit, a 9V compact battery was used.

For example, in an unattended shop - or reception area - the sound of the beep will alert

you to the fact that you have a customer. How long the output lasts depends on the values of R3

and C1.

Truth Table:

4011 ICA B F0 0 00 1 01 0 01 1 1

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