One of capacitive sensing oscillator circuit burglar alarm
Posted on Mar 28, 2007
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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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This is a circuit that generates white noise, rolled-off to drive earphones or a small speaker....
The load described here is capable of handling up to 10 watts of RF power for a couple of...
Hand and body motions in proximity to the sensing antennas produce frequency changes in a Hartley...
The circuit charges a 9-V battery at about 30 mA per input ampere at 0.4 V. Ul, a quad Schmitt...
The schematic diagram come from circuit: The Voltage Regulator With a Field Effect Transistor...
The 220-240V AC mains source is stepped down to 9V AC by transformer X1. The transformer output...
The positive feedback comparator circuit increases the gain ofthe op-amp, which helps to switch...
The leads from the transformer to the circuit are quite long (>5m). Apparently the 110V side of...
More and more serial bus systems are preferred instead of a parallel bus, because of the simpler...
This circuit operates an automotive windscreen washer pump to fill a 20-litre drum from a...
A photo relay or light activated relay is a circuit which opens and closes the relay contacts...
In a monostable multivibrator, one of the state is absolutely permanent i. e, stable and the...
Circuit is shown. It includes a full range of vibration sensors, follower, lamp relay control...
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