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)

 

 

Datasheets


N° of component