There are many ultrasonic pest repellers available on the market but a major drawback is that their power output is low and their effectiveness suffers. The electronic pest repeller generates powerful ultrasonic signals to repel pests.
In addition to the ultrasonic frequency oscillator built with CD4047, separate push-pull power amplifier (with 2N3055 or TIP31C) and transformer are used to boost ultrasonic signals. The output of the power amplifier is coupled to a tweeter through output transformer X1, which is wound over ferrite core (UU or CC core). Primary winding consists of 150 turns of 20 SWG while the secondary winding is 40 turns of 24 SWG wire. Adjust potentiometer VR1 for maximum effectiveness.
This electronic pest repeller circuit has not been tested.
Caution :
This is a powerful sonic pest repeller circuit so use it only in outdoor places.
Do not use this ultrasonic pest repeller near babies or animal pets.
In addition to the ultrasonic frequency oscillator built with CD4047, separate push-pull power amplifier (with 2N3055 or TIP31C) and transformer are used to boost ultrasonic signals. The output of the power amplifier is coupled to a tweeter through output transformer X1, which is wound over ferrite core (UU or CC core). Primary winding consists of 150 turns of 20 SWG while the secondary winding is 40 turns of 24 SWG wire. Adjust potentiometer VR1 for maximum effectiveness.
This electronic pest repeller circuit has not been tested.
Caution :
This is a powerful sonic pest repeller circuit so use it only in outdoor places.
Do not use this ultrasonic pest repeller near babies or animal pets.
Response of Animals to Ultrasound
1. 22-25 kHz Dogs, Cats2. 38-44 kHz Mosquitoes, Fleas, House Fly, Spiders, Cockroaches
3. 52-60 kHz Lizards
4. 60-72 kHz Rats
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