about 4 days ago - No comments
This simple fake car alarm or alarm decoy circuit device will simulate the presence of a burglar alarm in automobiles or homes. It has a few components, uses LM3909 and is easy to build. Mount R1 where daylight can fall on it. You may change the capacitor value for different flashing rates.
During darkness, LED1 flashes, More >
about 1 week ago - No comments
There are a wide range of applications for light sensitive switches: lighting, entrance door, automatic staircase, automatic opening of doors to the action of a ray of light, alarm systems, etc… Many of us are familiar with photosensitive switches made with a single transistor that is controlled by a photoresistor placed between the base and More >
about 1 month ago - No comments
This circuit simulates an alarm to discourage thieves and it is originally designed to be used on bicycles but can be used for cars too. It blinks a LED on and off thus simulating a real alarm circuit.
The LED alarm electronic circuit consists of a square wave oscillator generating a 1 MHz signal with a More >
about 1 month ago - 2 comments
Here is a solar powered Flasher to scare away the nocturnal animals like bats and cats from the farm yard or premises of the house. The brilliant multicolored flashes confuse these animals and they avoid the hostile situation. It is fully automatic, turns on in the evening and turns off in the morning.
D.Mohan kumar
The More >
about 1 month ago - 6 comments
Electronic DOG Chaser Repeller
The electronic dog repeller circuit produces a discomforting but not harmful, high frequency sound, audible to dogs but not to humans. Help stop the approach of unwanted dogs at up to 15 feet.
It uses 555 circuit at is easy to build, this is a dog chaser schematic that you can More >
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