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Ultrasonic pest repeller briefly explain

2017-08-16 20:59  
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This article is easy to explain the ultrasonic pest repeller. The combination of text read schematics would be more effective to grasp this principle. The circuit frequency ultrasonic acoustic emission gradual changing automatically. Use change these five steps, but also can be extended to 10 steps, if desired. For each clock pulse output operational amplifier  CA3130  IC1 (here as a low frequency square wave oscillator), a logic one output CD4017 IC2's (which is a well-known decade counter) changes in the fourth quarter from the point Q0 (or Q0 to come to your school of). VR2 by the efficacy of five preset VR6 (Q0 respectively connected to the output pin at the Q4) is set to different values ??and the connecting pin 7 IC3 (NE555) electrons. VR1 is used to change the clock frequency. IC3 is wired as an astable multivibrator operating frequency close to 80 kHz. Its output is asymmetrical. IC4 is CD4013, d-type flip-flop will be symmetrical 40 khz signal at its Q, Q output is amplified by the transistors in push-pull mode T1, T2, T3 and T4 driven low-cost, high-frequency piezo tweeter. For frequency adjustments, you can use an oscilloscope. It can also through trial and error if you do not have an oscilloscope. This pest repeller proved to be more effective than those released earlier, because here ultrasonic frequency is automatically changed to cover different pests and power output are high enough. If you want low-power output in the 30 - 50 kHz ultrasonic frequency range and crystal sensors can be connected directly to ask, ask output IC4 (transistor amplifier is not necessary if you are the first to understand this principle, may wish to look at a few times. this principle is simple but effective.

Ultrasonic Pest Repeller

 

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