alarms and security related schematics
Posted on Feb 5, 2014
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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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The 555 is configured in the standard astable oscillator circuit designed to give a square wave...
Photo diode outputs light current that is well proportional to input light power when it is used...
IC4, C1, R1 and R2 are used for the clock pulse which is fed to both the counters IC2 and IC3 Pin...
Hand and body motions in proximity to the sensing antennas produce frequency changes in a Hartley...
Insulated-gate, field-effect transistor (IGFET), Q2 and silicon photo cell Zl form the heart of...
Assuming I can get 5V in example after adjusting the pot in real use, will the 240 ohm resistor...
The diagram shows a rather simple voltage stabilizer design which can hold huge output power in...
To invoke the Spectrum +3 diagnostic routines, first reset the machine while holding the BREAK...
Here is a schematic of a very sensitive microphone preamp circuit, which can be used to increase...
Using this schematic I doubled the range of my IR LED, the power drawn in the circuit is now...
This line voltage power controller interfaces a DC control voltage or microprocessor logic output...
Buffers belong in a subset of amplifiers, in general. In addition, power buffers can be thought...
Circuit shown in Figure dimmer to 555 as the core component. 555 and R1, RP, R2, C1 composition...
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