Gate Alarm

Posted on Jan 1, 2013

Figure 1 represents a cheap and simple Gate Alarm, that is intended to run off a small universal AC-DC power supply. IC1a is a fast oscillator, and IC1b a slow oscillator, which are combined through IC1c to emit a high pip-pip-pip warning sound when a gate (or window, etc.) is opened. The circuit is intended not so much to sound like a siren or warning device, but rather to give the impression: `You have been noticed.

Gate Alarm
Click here to download the full size of the above Circuit.

Leave Comment

characters left:

New Circuits



Popular Circuits

Multipattern Running LEDs
Minimal metal detector
Telephone-Operated Ac Power Switch
Arduino Knock
tea5551t am radio receiver circuit design electronic project
ssr breakout boards
automatic dual output display circuit diagram
Speed-limit Alert
TDS9092 TDS971 IEEE-488/RS232C
Frequency counter Logic schematic
General Purpose Amplifier circuit diagram
RC relaxation type tone control circuit
Valve/Tube Low Frequency amplifier 30W