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This circuit generates a sweet melody for two minutes when it detects the shadow of a moving person. It uses the ROM IC UM66 to produce the melody. The music stops automatically.
LDR is used as the light sensor. In day light, its resistance is low and conducts. This keeps the base of T1 high and it remains off. When the shadow of the moving person falls on the LDR, its resistance increases and the current flowing through it decrease. T1 then conducts and C1 charges. This provides power to IC UM66. Zener diode ZD is used to regulate the supply voltage to UM66 to 3 volts. When UM 66 gets 3 volts supply, it oscillates and the music tone from it will be amplified by T2 which can be heard through the speaker
What else can I help you with?
Who is Edwin T Holmes?
Edwin t Holmes is a famous inventor who invented the burglar alarm
How do you use the word securing in a sentence?
Security is another word for safety or peace of mind. Synonyms of security include safeguard, sanctuary, and surety. "As a measure of security, the family installed a burglar alarm in their house."
Building material that start with a g?
· baseboards · baseboard heaters · bathtub · bay window · beams · boards · bolts & nuts · breaker electric load center · bricks · burglar alarm
Final year project for electronics?
It depends upon the area of your interest. There are many project ideas.. Some of them are: 1. Metal Detector. 2. Burglar Alarm. 3. Hand gesture mouse control. 4. Electronic code lock. etc. You can refer the websites also e.g. electronicsforu.com.
In a burglar alarm system can you use PIRs for an entry and exit zone?
PIR's are passive infrared detectors which operate when ever a warm body radiating in IR moves. One can set a threshold for amount of IR and hence indirectly for a given range and size of body temperature. So its obvious that on open areas this will not work as any animal could also trigger the alarm. However this alarm could be used to trigger a camera that is being monitored. If the monitoring has to be automatic than a pattern recognition software will have to used to ensure that a zone is being or has been infiltrated. PIR can be used more effectively in an closed room situation by coupling it with that zone is being infiltrated, that is infiltration will be from a window/door. Now a magnetic door switch can be used to detect the presence of the burglar. --- Yes, a PIR can be used for an entry/exit zone, but if you are using to protect the door as well as a room, I would recommend you lower the entry delay time to as low as possible.
When was AMCO Burglar Alarm Company created?
AMCO Burglar Alarm Company was created in 1995.
Who invented the burglar alarm?
Edwin Holmes invented the burglar alarm in 1852
What are the release dates for The Burglar Alarm - 1914?
The Burglar Alarm - 1914 was released on: USA: 11 August 1914
What are the release dates for The Burglar Alarm - 1918?
The Burglar Alarm - 1918 was released on: USA: 7 July 1918
What are the release dates for The Burglar Alarm - 1923?
The Burglar Alarm - 1923 was released on: USA: 24 June 1923
When was the first burglar alarm invented?
Five years after the burglar was invented.
What is the best type of burglar alarm in California?
ADT is the best burglar alarm system available in California. It's useful not only for a burglar alarm but also for fires or just for knowing when your children go in and out the door.
Who invented the burglar alarm and when was it invented?
In 1850 Mr. Augustus Pope of Boston invented the first electrical burglar alarm.
What are the release dates for Bang's Burglar Alarm - 1914?
Bang's Burglar Alarm - 1914 was released on: USA: December 1914
Alfonso alvarez blade invented the burglar alarm in 1911?
Alfonso Alvarez Blade did not invent the burglar alarm in 1911. The first patent for an electric burglar alarm system was filed by Augustus Pope in 1853, and the first practical electric burglar alarm was invented by Edwin Holmes in the late 1850s.
What is ultimate burglar alarm?
a parrot
What is a burglar alarm?
A burglar alarm is a warning device which is tripped off by the occurrence of a burglary, or the loud warning signal produced by such a device.
