Ultrasonic Generator II (ART540E)

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This article is part of my book CMOS Projects and Experiments with the 4093 IC. The article describes on more applications of the 4093 IC in the generation of ultrasonic signals. See more in this section.

Two 4093 ICs can be used to perform a powerful ultrasonic generator, as we show in this project. The circuit drives a piezoelectric transducer or crystal earphone with some tens of milliwatts and operates in a frequency range between 18,000 and 40,000 Hz.

The frequency range can also be altered by changing the value of C2. The upper limit of the circuit is 1 MHz.

Biological experiments related to animal behavior and conditioning can be conducted using this oscillator. The power supply is formed by four AA cells or a 9 V battery.

The circuit drains only few milliamperes, extending the power supply life to several weeks.

R1 can be connected in series with a 47,000 ohm potentiometer to allow frequency adjustment in a wide range.

The schematic diagram or the Ultrasonic Generator is shown in fig 1.


Figure 1 – Schematic diagram of the generator
Figure 1 – Schematic diagram of the generator


For the transducer, you can also use a piezoelectric tweeter. This component has a small output transformer inside, as shown in Fig 2. You have to disconnect the transformer to use the tweeter in this project.


Figure 2- Using a low-impedance common tweeter
Figure 2- Using a low-impedance common tweeter


Small piezoelectric transducers can also be used in this project.



IC1, IC2 - 4093 CMOS integrated circuit

X1 - Piezoelectric Transducer or crystal earphone,

R1 - 27,000-ohm, 1/4 W, 5% - resistor

C1 - 100 uF, 12 WVDC - electrolytic capacitor

C2 - 0.001 uF ceramic or metal film - capacitor

S1 - SPST Toggle or momentary switch

B1 - 6 V (four AA cells) or 9 V (battery)