Door Alarm
Posted on Apr 14, 2012
New Circuits
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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.....
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Can be directly connected to CD players, tuners and tape recorders. Tested with several...
The circuit is capable of supplying either a trickle (50 mA) or high-current (1-A) charge. You...
This circuit is for low voltage applications requiring high power outputs. Output power levels of...
On most FM tuners, the stereo indicator lights upon detection of the 19-kHz pilot tone. However,...
A potentiometer is a simple knob that provides a variable resistance, which you can read into the...
Front and rear fog lamp schematic of Daewoo Korando shown in the following figure. It shows the...
Borrowing techniques echo sounder used to measure ocean depth, distance measuring device can be...
This is a simple 12V rechargeable smart battery charger circuit. You can use this best battery...
Many electronic circuits related to fan speed controlling have been published here and this one...
Digital filters are incredibly powerful, but easy to use. In fact, this is one of the main...
The figure is zero and span adjustment circuit includes a feedback resistor network and...
Infrared alarm system is the use of infrared LED emits invisible light, when the light is blocked...
AC 30V through I). - After the dish rectified by its positive terminal connected to the fuse IA...
As shown in Figure 555 is the transistor characteristic curve tracer circuit depict transistor...
Circuit shown in Figure 3-99. The low start-up circuit to the motor ( shaped connection), then...
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