door alarm
Posted on Feb 6, 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 regulated dc with less than 100 mV of ripple for microprocessor...
This stabilized voltage-to-frequency converter features 1 Hz -1.25 MHz operation, 0.05%...
By using a low-cost RS-170 camera and this circuit, a voltage that trades the position of an...
Most of the IR remotes work reliably within a range of 5 metres. The circuit complexity increases...
The circuit is use to regulation dual power supply that provides +12V and -12V from the AC mains....
I have a circuit (see attached) provided by an LCD manufacturer that illustrates using the POL...
Figure 1 shows a circuit for sensing the water level in a tank and turning on or off a water pump...
An explanation of how the thing should work. The TPS_EN line is low at first. Since it is pulled...
The oxygen sensor simulator as built on a protoboard. Note the cigarette lighter plug used for...
This module is a "tribute" module, based on the awesome Steiner-Parker Synth VCF. Those who know...
rfRXD0920 The RFRXD0420 RFRXD0920 are low cost, compact single frequency short-range Radio...
O The SA1021 integrated Radio receiver circuit is for portable Radios stereo as well as mono,...
This circuit runs a fast battery test without the need of power supply or expensive moving-coil...
All you really need is a decent opamp, three resistors, three caps. Make one of the resistors...
A block diagram of the Commodore 64 internal power supply (how the +12V, +9V and TOD clock...
characters left: