Telephone status monitor
Posted on Jul 16, 2012
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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 transmitter runs on only 3V whereas most others run on more voltage. This dirt cheap item...
Earphones, batteries are sold separately. AM / FM seems to be a common mold. But stamping is...
An electrical signal taken from the low tension side of the distributor is converted into a...
A 741 op amp is used with 100% ac and dc feedback to provide a typical input impedance of 1011...
Large LCD devices of 1 or more exhibit a large driving capacitance to the driver circuits. To...
This LM350 Car battery charger circuit project is a high performance charger that quickly charges...
The current testbed deployment provides some degree of device heterogeneity by integrating two...
The PIC18F4550 chip contains more features than the PIC16F including a module for USB...
These two headlight reminder circuits are easy to install and operate on the KISS (Keep It Simple...
The first time you sign into developerWorks, a profile is created for you. Select information in...
Following in the footsteps of the "primitive" but quite successful 4 pin OM802 timer IC...
4013 pairs of D-type flip-flop in the astable multivibrator is used as a binary divider output,...
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