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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Based on Valvo FD-1A module, TBA120, and MC1310. Operation of the receiver is based on the phase...
A very good circuit of pre-preamplifier, for amplification of signals from heads of Moving Coil....
This adapter circuit, based on a dual four-channel analog multiplexer handles digital signals to...
When the digital logic level at the control input is low, the PIN diode is forward-biased by the...
A low-frequency, op-amp oscillator and a VCO, both configured from a single MC3405 ~dual op amp...
The circuit is capable of supplying either a trickle (50 mA) or high-current (1-A) charge. You...
i`ve been wrapped up in Jeep repair lately as there`s some sort of issue prevent the beloved XJ...
In order to manufacture large quantities of anything, there needs to be a manufacturing system or...
For the receiver circuit and display modulewill receive the high frequency AC power cordand...
The 220-240V AC mains source is stepped down to 9V AC by transformer X1. The transformer output...
It functions like almost any 555 astable timer, except that the LED is inserted into the...
It should default on when first connected, but if a particular signal goes high for a small...
Using analog audio line delay, you can adjust your room virtually. Just turn a knob in your audio...
This is a common control voltage in industrial and telecommunications equipment, so the relays...
With the equipment ready for operation, the main line switch (S-831), the EMERGENCY SWITCH (S-12)...
The Astable multivibrator circuit has no stable state. With no external signal applied, the...
A 2002 blazer and I ran the codes on it and it came up po 155 and po 756 which a 02 sensor heater...
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