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Welcome to Electronics and Electrical Engineering Laboratory.

DC to DC Converter-6V to 12V Convert

Power / Voltage - Voltage Converter
This is a inverter circuit diagram. This circuit can provide up to 800mA of 12V power from a 6V supply. For example, If you could run 12V car accessories in a 6V  car. The circuit is simple, about 75% efficient and quite useful. By changing just a few components, you can also modify it for different voltages.
 

Safe and Security System Alarm circuit diagram

Security - Security System

 

This security system is very important for any kinds of home , office , factor. there has a circuit diagram its simple and easy to build . Any one can do it. It's a low cost circuit diagram.

Many security systems use a closed loop of wires and switches arranged so that whenever a door or window is opened, the loop will be broken and the alarm will sound. An obvious problem is that someone can tamper with the system, short out the loop, and later on, come back and burglarize the premises without sounding the alarm. Hiding a known resistance in the loop, as you propose, is a very good idea. That way, the alarm can distinguish a short circuit from a correctly functioning closed loop.

 

1.5 Watt FM Transmitter Circuit (Range 1-2 KM)

This is 1.5 Watt FM Transmitter circuit diagram.  This diagram should be able to cover 1-2 KM range. This circuit diagram is very easy and it works very nice. 

 

Automatic Volume Control

Audio - Volume Control
 
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