SIMPLE ULTRASONIC GENERATOR
The ultrasonic generator circuit utilizes the NE555 timer integrated circuit, which is configured in astable mode to produce a continuous square wave signal. This signal drives a piezoelectric speaker, specifically a piezo tweeter, denoted as SPKRI, which is capable of converting the electrical signal into ultrasonic sound waves. The frequency output can be adjusted within a range of 12 kHz to 50 kHz, allowing for versatility in applications such as pest control, cleaning, and ultrasonic sensing.
In the schematic, the NE555 timer is connected with two resistors and a capacitor that determine the frequency of oscillation. The values of these components can be calculated using the formula for the frequency of a 555 timer in astable mode:
\[ f = \frac{1.44}{(R1 + 2R2)C} \]
where \( R1 \) and \( R2 \) are the resistances in ohms, and \( C \) is the capacitance in farads. By selecting appropriate values for \( R1 \), \( R2 \), and \( C \), the desired frequency can be achieved.
The output from the NE555 is connected directly to the piezo tweeter, which operates efficiently at ultrasonic frequencies. A power supply, typically between 5V to 15V, is required to power the NE555 timer and provide sufficient voltage to drive the piezo tweeter. Additionally, bypass capacitors may be included near the power supply pins of the NE555 to filter out any noise and stabilize the operation of the circuit.
This ultrasonic generator circuit is straightforward and can be assembled on a breadboard or PCB for practical applications. The simplicity of the design allows for easy modifications and experimentation with different frequencies and output characteristics.This basic ultrasonic generator can be built easily and quickly. An NE555 drives a speaker. The frequency range is 12 to 50 kHz. SPKRI is a piezo tweeter, etc. 🔗 External reference
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