A Beeper circuit is a simple but sophisticated electronic device that produces a monotonous beeping sound which can be used for alarming or indication purposes in places such as hospitals, police stations, or Fire brigade stations. They are simple to design, easy to use & require a negligible amount of maintenance. So, in this project, we are going to design a simple beeper circuit using a CD4011 2-Input NAND gate IC.
CD4011 is a 2-input 4 NAND gate IC, serving in many electronic circuits. CD4011 performs the Logical NAND function. When you want to use it as a logic inverter, NAND gates in this chip are reconfigurable to function as a NOT gate. It can be used where high-speed NAND operation is necessary. This chip has a low transition time which is needed for high-speed applications.
Hardware Components
The following components are required to make Beeper Circuit
| S.no | Component | Value | Qty |
|---|---|---|---|
| 1. | Breadboard | – | 1 |
| 2. | Battery | 9v | 1 |
| 3. | Connecting Wire | – | 1 |
| 4. | 2-Input NAND GATE IC | CD4011 | 1 |
| 5. | NPN Transistor | 2N4401 | 1 |
| 6. | Piezo Buzzer | – | 1 |
| 7. | Electrolytic Capacitor | 470uF | 1 |
| 8. | Resistors | 1k, 470 ohms | 2, 1 |
| 9. | LED | 5mm | 1 |
CD4011 Pinout
For a detailed description of pinout, dimension features, and specifications download the datasheet of CD4011
2N4401 Pinout
For a detailed description of pinout, dimension features, and specifications download the datasheet of 2N4401
Beeper Circuit
Working Explanation
The core of this circuit is the 2 NAND gates working through the CD4011 IC. Here, the 2 NAND gates are wired as an astable multivibrator due to which the output at pin4 of the IC continuously goes high and low.
This continuously toggles the 2N4401 transistor (ON & OFF) which provides the drive for the piezoelectric buzzer. Hence, the piezo-buzzer generates beeps, and the LED flashes continuously.
Applications
- Typical uses of beepers include devices such as alarm devices, timers, and confirmation of user input such as a mouse click or keystroke.
- Acts as an effective low-cost implement for every day alarming & indicating purposes.
