Telephone electronic lock circuit
Posted on Dec 11, 2010
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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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The following circuit is an example how to get power from RS-232 serial port. It gives regulated...
It was designed for an application in a welding machine: there are lots of bits of machinery...
This voltage-regulator/cuiTent-liimter combination can be made from two 7805 regulators as...
This super simple design of aninvertercircuit does not limit it in any way from providing a high...
Nowadays it has become necessary to own a car battery charger at home. By keeping one at home, we...
This is a good project on GSM Based Home Automation and submitted in partial fulfillment of the...
The schematic above illustrates dividing a crystal oscillator signal by the crystal frequency to...
This alarm can be very useful in a room or an area that should normally have no movement at all...
Also called the parallel A/D converter, this circuit is the simplest to understand. It is formed...
This network wiring tester comprises two elements, a transmitter unit, powered and fitted at the...
The PA output Pi section consists of 2 variable Cs (20 - 120pF and a second (home made) 50 -...
When the switch is on, the seismic alarm isin detection condition. When there is no earthquake,...
A sense of three-point oscillator, also known as Hartley oscillator, the Colpitts oscillator with...
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