Telephone Line Indicator Circuit
Posted on Feb 7, 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.....
.
This circuit provides a good siren noise suitable for warding off robot-predators! Change the...
The trip point is set half way between the supplies by Rl and R2; R3 provides over 200 mV of...
.webp "Open page in a new tab")
I would like to thank you`s for the manual that i purchased, it is as stated, i am now able to...
By using a potentiometer, R2, as one of the resistors you can dial up the output voltage wanted....
How to get an LED-Wiz to control pinball solenoids. Rottendog Amusements makes modern replacement...
Here is a remote operated spy robot circuit which can be controlled by using a wireless remote...
Abstract: The MAX1896 MAX1973 and MAX8863 combine to deliver 5V at 225mA, 1. 8V at 220mA, and 3....
The simple conjuring trick in Figure 1 is intended to provide some enjoyment for the beginner in...
The resistor in series with the LED in Collector circuit of transistor T1 must be 470 ohm, not...
The schematic diagram below shows a simple trivial low-cost 12 volt DC 50W off-line SMPS...
Pressure transmitter circuit data acquisition system by 1B31,18 bit A / D converter AD1170 and...
The device circuit works shown in Figure 11. Power outages are frequent thing, but some...
characters left: