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Powerful Ultrasonic Emitter (ART470E)

This ultrasonic transmitter can be used for conditioning animals such as scarecrow and in several other applications. The circuit is powered by medium or large batteries or power source, depending on usage.

The circuit presented has a power of a few watts, and can excite a piezoelectric tweeter that has good performance up to about 25 kHz. With this, we can reach the inaudible range for humans, but within the auditory range of many animals.

The circuit uses common components and has a frequency setting. The transistor can be replaced by a power MOSFET and power supplied with 12 V to further increase the output power.

Basically the circuit consists of an oscillator drawn around three of the four 4011 NAND gates. The fourth port is used as a digital amplifier that excites the output transistor. The frequency depends on C1 and the setting of P1.



In figure 1 we have the complete diagram of the emitter.


Figure 1 - Emitter Diagram
Figure 1 - Emitter Diagram



The assembly can be done in a protoboard matrix if the purpose of the project is experimental or didactic, as shown in figure 2.


Figure 2 - Assembly in a protoboard
Figure 2 - Assembly in a protoboard


For a definitive version, we have the printed circuit board shown in figure 3.


Figure 3 - Printed circuit board for mounting
Figure 3 - Printed circuit board for mounting


On assembly, note the position of the integrated circuit and transistor. The resistors are 1/8 W with any tolerance and the capacitor can be ceramic or polyester. For power supply use medium or large batteries, given the consumption, being the ideal use of a source of at least 300 mA.

To adjust, turn on the unit and turn P1 until the sound becomes very sharp and then disappear.


CI-1 - 4011 - integrated circuit

Q1 - BD135 or equivalent - medium power NPN transistor

FTE - 4 or 8 ohm - piezoelectric tweeter

S1 – On/Off switch

B1 - 6 V - medium or large batteries or power supply

P1 - 47 k ohm - trimpot

R1 - 4k7 ohm - resistor - yellow, violet, red

R2 - 10 k ohm - resistor - brown, black, orange

R3 - 1k2 ohm - resistor - brown, red, red



Printed circuit board or contact array, battery or source holder, wires, solder, mounting box, etc.