Design Caller ID using DTMF decoder MT8870
Posted on Feb 4, 2014
Related Circuits
New Circuits
-
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.....
.
A simple solenoid driver uses incandescent lamp filaments as on-indicators to limit power...
The circuit uses a synchronous-detection scheme to measure low-level resistances. Other...
Only one channel of this circuit is shown. The other is practically a carbon copy.The input to...
The microphone input, MIC1, is fed through C3 and R4 to inverting amplifier U2-a; the gain of...
Here is my Sputnik QSO Party transmitter prototype. The RF output power is 450mW with 70Vdc @ 14....
This circuit is average reading use rms calibrated AC voltmeter. Deletion of C2 removes the...
Every driver knows that a high intensity light striking one`s eyes can have dangerous...
Field Strength Meter Using A Biased Schottky Detector A temperature compensated Schottky diode is...
SCRs are sensitive to high voltage, over-current, and any form of transients. For satisfactory...
An interesting circuit of a true-portable and cute solid-state bright light built with LT1932....
A shift register works by shifting data to the right with each clock pulse. Regardless of if the...
Diagram shows an R-C-Diode circuit giving full half-cycle control (180 electrical degrees). On...
A three-phase electric motor is over- current protection circuit. How it works: This example...
characters left: