Ultrasonic pest repeller
Posted on May 24, 2012
New Circuits
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This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of.... -
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is.... -
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to.... -
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This.... -
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the.... -
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,.... -
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the.... -
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power.... -
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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This relatively simple mixer was designed for three dynamic microphones, but can be re-designed...
With the P1 we regulate the intensity of sound. With the P2 we regulate the frequency of...
The 555 is wired as an astable and the capacitor is charged only through the 4,7Kohm trimmer...
The 566 can be wired as a positive or negative ramp generator. In the positive ramp generator,...
This converter enables a receiver that tunes 28 to 32 MHz to receive the 144- to 148-MHz amateur...
The output goes high when a preset temperature is exceeded. A fixed half-supply reference...
This thermometer is capable of measuring temperatures from - 30 to +120 °F. A diode-connected...
This approach uses a Hip-Hop, a shift register, and two gates (A). Before the one-shot pulse,...
This circuit was designed to protect a computer monitor from overheating. It is recommended to...
using the LM3915 monolithic integrated circuit can be designed a very simple audio power level...
This circuit is an Electronic Locker. It is controlled by a switches combination (by a code)....
A high-voltage current-limiting transformer (T1) supplies power to the basic LC tuned circuit. As...
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