Burglar alarm circuit


Posted on Mar 28, 2007

A simple burglar alarm circuits, sensors pyroelectric sensor IRA-E100SZI. When human movement is detected, the pressure on the electric buzzer alarm whistle. Sensor receives si


Burglar alarm circuit
Click here to download the full size of the above Circuit.

gnals via AC amplifier, and then by the rectifier circuit into a DC drive transistor VT1, VT2 when turned on. Piezoelectric buzzer alarm. Several nearby Hertz gain amplifier circuit requires about 70dB, single-stage amplifier is not enough, it can be multi-stage amplifier to ensure the necessary gain. When the input signal is generated by the body movement is very weak, the general use of the optical zoom system.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Automatic Charger for Battery Hi-Fi Preamps
Audio noise generator
mic circuit
control relay with infrared circuit
10.58 to 10.74 mhz vfo oscillator circuit
Four channel RF remote control
Game Circuits
How to build Modular Class A Buffer preamplifier
The application circuit of TDA7088 FM integrated circuit
Simple and practical power SCR trigger circuit diagram



Top