Extension Phone Ringer
Posted on Dec 29, 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 circuit is used to convert a mono audio signal into a stereo signal that can be panned...
One of the main features of the regulated power supply circuit being presented is that though...
This original design is a variation on a well-known design, examples of which can be found in a...
The op amp is wired as a 2 noninverting dc amplifier with a gain that is determined by the...
The circuit protects a solid-state relay from overloads. The circuit limits current,...
This is the schematic diagram of 300W power inverter circuit. The inverter uses power transistor...
The circuit is based on the theory that insects like mosquito can be repelled by using sound...
A common problem in crystal sinusoidal oscillators is the excitation of unwanted modes of the...
High-efficiency step-down switching regulators for positive voltages are very common, however...
This audio amplifier circuit is useful in classrooms to reduce the strain of lecturing, if the...
Here is an example which implements a clock in just 36 lines of perl code. It displays time and...
This low-cost burglar alarm employs a 12V strobe light and a truck reversing horn as the visible...
The regulated output voltage varied as the unregulated DC voltage changed, and that changed as...
Cost-effective nickel-cadmium battery charger LM393 constructed as shown, it has the following...
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