telephone line loger
Posted on Nov 19, 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 project shows you how to build a relay controller using the Basic Stamp I interfaced to the...
The controller uses one or more ordinary silicon diodes as a sensor, and uses a cheap opamp as...
The ping of the cymbals, crack of the snare drum, thonk of the bass - none of these comes through...
This low-voltage high-current output, sWitching de power supply is running off the 220-Vac input....
Al and A2 are two sections of a quad comparator. The first, Al, functions as an amplifier and...
Diagram below shows a simplified diagram of the main peripherals present in the 89S52 or 8052 /...
A nice design which even turns off if the pushbutton is held depressed or jammed a long time. Not...
The first was interested in a flexible preamp for use with a high-end acoustic guitar with...
This varactorless high frequency modulator electronic project, must be powered from a simple DC 3...
Where good frequency stability is required, in applications such radio transmitters, basic LC...
A sensor in garden railway applications. Hall Effect sensors are the electronic equivalent of a...
Differential amplifier circuit four connection methods and compare the characteristics of d d. O...
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