Door-ajar-monitor
Posted on Dec 29, 2012
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.....
.
An AM loop antenna is one of the true marvels of electronics. Requiring no power, it takes...
The 24 watt amp is easy to build, and very inexpensive. The circuit can be used as a booster in a...
This circuit converts a tape recorder into a completely automatic telephone conversation...
Use a pair of Maxim"s 5V-powered MAX231 RS-232C transmitters as drivers to obtain a 2-color LED....
When power is applied, the thermistor, a negative tc device, is at a high value. A1 saturates...
IC2 forms a stable oscillator whose frequency and pulse width is determined by the values of R4,...
Here the AM Radio receiver circuit diagram based on old single IC MK484. Components part list:...
A warm weather problem with 2003 Audi A6 2. 7T. When the car sits in the sun the radio loses...
Wrap hundreds of turns of magnet wire around the paper tube. Connect this home-made inductor in...
The simplest solution for implementing joystick control for a robot would be to program the...
Alright, my 2204 won`t bias properly. I can`t get the tubes to idle at more than about 14 W (435...
The circuit uses 50 BUZ23 field effect transistors connected in parallel, tube blocking voltage...
A precision shown by the LM567 timer circuit MPI826 constructed and where LM567 used as a...
Analog switches sl and sa disconnect, Ctz the inverted logic signal to terminal 2 s! And 84 is...
Circuit, if the thermistor K273 temperature reaches the setting level or not two sensor...
characters left: