Alarm Phone Dialer
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 complete high quality, low noise mono audio power amplifier is based around the Hybrid...
I have had requests to add a VHF FM transmitter, to the QRP collection. This project is a simple...
One of the control circuit"s triacs selects the tap on main transformer Tl, which provides the...
A VU (Volume Unit) meters used to be the mainstay of audio metering system. The Peak Program...
Here is the latest and abundantly bigger TX200 VFO/VCO FM transmitter. The best able transmitter...
This is a class AB transistor power amplifier. It is a simple amplifier to build, uses standard...
Many cable testers have been published before, some quite complex, but here`s a cheap and simple...
An illustration of the electronic impedances of a solid-state nanopore chip. (b) Simplified...
This alarm system has 6 independent zones, 1 timed entry/exit zone, a 7 segment LED display and a...
Circuit works: lC is a 555 IC. Incoming calls, 220 V electricity through R1 Buck, VD1 rectifier,...
characters left: