Last Updated on March 16, 2024
This configurable alarm produces different types of tones. It can be selected by switches, this circuit can be activated by temperature by connecting applications with the switch we can get different alarm tones for each applications.
The IC CD4060 is a CMOS oscillator with a 14 stage ripple counter/divider. This IC has three oscillator terminals by varying components value connected with this terminals we can get variable frequency range.
Components List
| S.No | Name | Quantity |
| 1. | IC CD4060 | 1 |
| 2. | NTC 100KΩ thermister | 1 |
| 3. | Loud speaker 8Ω | 1 |
| 4. | Resistor 1KΩ Resistor 10kΩ Resistor 220kΩ Resistor 10kΩ Resistor 5.6kΩ Resistor 10Ω Variable resistor 22KΩ Variable resistor 100KΩ |
3 2 1 1 1 1 1 1 |
| 5. | LED | 2 |
| 6. | Transistor BC337 npn BD139 npn |
2 1 |
| 7. | Capacitor 0.33uF Capacitor 100pF Capacitor 10nF Capacitor 120pF Capacitor 100uF/10V |
2 1 1 1 1 |
| 8. | ON/OFF array-10 switch | 1 |