Insect Repellant
#insect repellant
#phase locked loop
#CMOS 4047
#22KHz oscillator
#complimentary output transistors
#piezo
#external power supply
#Graham Maynard
Description: Repell those repugnant insects from your Garden this Summer with this insect repellant circuit. Designed by Graham Maynard, the circuitry consists of a phase locked loop (CMOS 4047) wired as a 22KHz oscillator. The output is amplified by a pair of complimentary output transistors and drives a Motorola 3.25 inch Piezo. Current drain is around 120mA so an external power supply is recommended. More: The piezo used was a standard 85mm square Motorola Horn, Maplin part number WF09K or WF55K. These are rated +/-3dB to 28kHz.
The insect repellant circuit operates primarily by generating ultrasonic sound waves that are unpleasant to insects, effectively deterring them from the area. The heart of the circuit is the CMOS 4047 phase-locked loop, configured to function as an oscillator producing a frequency of 22 kHz. This frequency is above the range of human hearing but within the sensitivity range of many insect species.
The output from the 4047 is a square wave signal, which is then fed into a pair of complementary output transistors. These transistors serve to amplify the signal, ensuring that sufficient power is delivered to the piezoelectric transducer. The choice of a Motorola 3.25-inch piezo horn allows for effective sound projection, leveraging its design to emit sound waves efficiently across a wider area.
The circuit is designed to operate with a current drain of approximately 120mA, necessitating an external power supply to ensure stable operation. It is advisable to use a regulated power source to maintain consistent output and prevent any fluctuations that could affect performance.
The piezo used in this circuit is a standard 85mm square Motorola Horn, specifically part numbers WF09K or WF55K. These components have a frequency response rated at +/-3dB up to 28 kHz, which makes them suitable for this application, as they can effectively produce the desired ultrasonic frequencies while maintaining clarity and volume.
In summary, this insect repellant circuit effectively combines a CMOS oscillator with a robust amplification stage and a high-performance piezo transducer, creating a reliable solution for deterring unwanted insects in garden environments.Repell those repugnent insects from your Garden this Summer with this insect repellant circuit. Designed by Graham Maynard the circuitry consists of a phase locked loop (CMOS 4047) wired as a 22KHz oscillator. The output is amplified by a pair of complimentary output transistors and drives a Motorola 3.25 inch Piezo.
Current drain is around 120mA so an external power supply is recommended. The piezo used was a standard 85mm square Motorola Horn, Maplin part number WF09K or WF55K. These are rated+/-3dB to 28kHz.
The insect repellant circuit operates primarily by generating ultrasonic sound waves that are unpleasant to insects, effectively deterring them from the area. The heart of the circuit is the CMOS 4047 phase-locked loop, configured to function as an oscillator producing a frequency of 22 kHz. This frequency is above the range of human hearing but within the sensitivity range of many insect species.
The output from the 4047 is a square wave signal, which is then fed into a pair of complementary output transistors. These transistors serve to amplify the signal, ensuring that sufficient power is delivered to the piezoelectric transducer. The choice of a Motorola 3.25-inch piezo horn allows for effective sound projection, leveraging its design to emit sound waves efficiently across a wider area.
The circuit is designed to operate with a current drain of approximately 120mA, necessitating an external power supply to ensure stable operation. It is advisable to use a regulated power source to maintain consistent output and prevent any fluctuations that could affect performance.
The piezo used in this circuit is a standard 85mm square Motorola Horn, specifically part numbers WF09K or WF55K. These components have a frequency response rated at +/-3dB up to 28 kHz, which makes them suitable for this application, as they can effectively produce the desired ultrasonic frequencies while maintaining clarity and volume.
In summary, this insect repellant circuit effectively combines a CMOS oscillator with a robust amplification stage and a high-performance piezo transducer, creating a reliable solution for deterring unwanted insects in garden environments.Repell those repugnent insects from your Garden this Summer with this insect repellant circuit. Designed by Graham Maynard the circuitry consists of a phase locked loop (CMOS 4047) wired as a 22KHz oscillator. The output is amplified by a pair of complimentary output transistors and drives a Motorola 3.25 inch Piezo.
Current drain is around 120mA so an external power supply is recommended. The piezo used was a standard 85mm square Motorola Horn, Maplin part number WF09K or WF55K. These are rated+/-3dB to 28kHz.
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