Personal-pocket-pager
Posted on Aug 9, 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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A follow up Mk2 version described by EA`s Jim Rowe in the May/June/July 94 issues of EA improved...
One of the most interesting projects to work with is that of a synthesizer that can accurately...
Your 5x7 display is my favourite toy; the tunes and graphics in the elevator display always...
The circuit uses the exceptionally low input current (O.lpA) of the CA3420 BiMOS op amp. With...
This circuit has the CMOS IC doing double-duty performance. The first two inverters operate as a...
The Brusless DC motor of permanent magnetism is a new electrical machinery with new principle,...
Build as simple a circuit as possible that will pull a logic line low every time an automotive...
The thyristor fired coilgun is a common variant, due mainly to their high voltage and pulsed...
A small biped walker made of 2mm plywood. Powered by two RC servos. it is a popular...
An IDE interface board and I`m currently working on the driver software to support...
As described in the block diagram page, this is the system that provides power supply for all the...
A seven segment display is the most basic electronic display device that can display digits from...
A radio that was stored for years on a dusty shelf must be awakened gently to return to its...
Infrared alarm system is the use of infrared LED emits invisible light, when the light is blocked...
Second order band-pass filter performance depends primarily on the quality factor Q and center...
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