Countless projects have been developed with a variety of alarming effects. We prefer different sound effects in different places. For instance, in security-based projects sharp and alarming sound is considered the best option, whereas, in the doorbell, the soft sound is found pleasant to the ears. Thus, it is more appropriate to have related sound effects for particular areas. The project “Machine Sound Generator Using 555 Timer IC” is a similar project aiming to generate machine sound solely for industrial applications.
However, the circuit Machine Sound Generator Using 555 Timer IC can also be employed in other fields as well. The fact that this project is economical and for important reasons behind the simplicity and uniqueness of this circuit, recently people are more fascinated with it.
Circuit Description of Machine Sound Generator Using 555 Timer IC
The basic block of the project machine sound generator is timer IC NE555 (IC1), around which the entire circuit has been developed. It is accompanied further by two transistors. Timer IC; IC1 is configured as an astable multivibrator and a transistor pair is used as a clock oscillator. The value of oscillated frequency varies along with the variation in values of resistors; R1 & R2 and capacitors; C1 and C2. Clock pulse from transistor is given to pin no. 5 of IC1 through resistor R5. The LEDs connected to the collector of each transistor are used to indicate the sound intensity. The output from pin 3 of IC1 is fed to the loudspeaker through capacitor C3.
PARTS LIST OF MACHINE SOUND GENERATOR
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| Resistors (all ¼-watt, ± 5% Carbon) |
| R1, R2 = 4.7 KΩ
R3, R4 = 330 Ω R5, R6 = 1 KΩ |
| Capacitors |
| C1 = 1000 µF, 16V (Electrolytic capacitor)
C2 = 10 µF, 16V (Electrolytic capacitor) C3 = 100 µF, 16V (Electrolytic capacitor) C4 = 4.7 µF, 16V (Electrolytic capacitor) |
| Semiconductors |
| IC1 = NE555 (Timer IC)
T1, T2 = BC148 or BC548 (General purpose NPN Transistor) |
| Miscellaneous |
| LED1 = RED
LED2 = GREEN LS1 = 8Ω loud speaker |
Hi Thanks for this circuit.
Since the NE555 can take up to 18V, applying a 9V DC supply to this circuit should be OK Right?
How can I add a volume control to this circuit?
Hi Tec, The Timer IC 555 can operate from a supply voltage between 4.5 volts and 18 volts i.e. you can supply any voltage between 4.5V to 18V. Here, 4.5V and 18V is the absolute minimum and maximum value respectively. In order to add volume control, simply add one variable resistor between PIN3 of 555 IC and speaker.