Telephony Circuits and DTMF Circuits
Posted on Feb 7, 2014
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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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To design a Tube Headphone Amplifier we need a triode with uncommon characteristics: enough...
This circuit will automatically switch on several mains-powered "slave" loads when a "master"...
Many systems require one or more relatively low-current voltage sources which can be programmed...
In principle, the square wave oscillator doesn`t have to be a 555 timer, it could be a ring...
This is a design sensor circuit that can be used for sensing the light. This circuit is using a...
When the switch is opened, the timer produces an approximate 1 second clock signal, decrementing...
Here is a very simple project of a door bell circuit. The heart of the circuit is UM66 melody IC...
As we activate to adore those apathetic bleared canicule of summer, the best important affair on...
The water sensor circuit is based on a 555 timer circuit and come common electronic components....
An ideal solution to harvest Solar energy for charging purpose. This charger can replenish almost...
The intercom schematic fulfills its tasks to provide a reliable communication line and is very...
The Universal Serial Bus (USB) has become a ubiquitous technology for computer peripherals. It is...
Upper traces show voltages VOUT, lower traces show transients. Frequency transition at 500 us....
With two light barriers closely positioned one after the other it is possible to establish in...
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