Automatic recording telephone interface circuit
Posted on Mar 28, 2007
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.....
.
Designed for self-powered 8, 4 & 2 Ohm loudspeakers. This amplifier was designed to be...
Want to add video to your next project? This device uses a PIC16F819 and not much else. Getting...
Some circuits that add binary numbers have problems with time delay caused by carry propagation....
This circuit uses readily available parts to implement a 0-to-200-nA current source. The circuit...
The NE602 chip, Ul, contains oscillator and mixer stages. The mixer combines the oscillator...
To reach low channel ON resistance (<30 Ohm) and low OFF current leakage, 4-channel commutator...
When the circuit is first powered up, neither transistor will be switched on. However, this means...
Free-energy" or "G-solar energy" as solar infrared radiation energy stored in the gravitational...
The circuit diagram of a simple capacitance meter using IC LM2917 is shown here. The LM2917 is a...
a miniature version of the classic PONG game. The PONG game was invented back in 1966 by Ralph...
The past experiences was pretty difficult, because the car horns have an inductive charge and it...
This article describes the DDDAC 2000 Audiophile projects (1N4001). The content is very simple,...
With hv insulation inside ie polystyrene. If you put ferrite in it could be a way to reduce the...
As shown for the basic connection circuit ISO107 signal and power supply. Each power supply...
characters left: