Alarm
Cheap Motorcycle Alarm
This is simple to build and cheap motorcycle alarm circuit which could be fitted in motorcycles to take care of…
Fire Alarm with LDR Sensor
This is the fire alarm circuit which use LDR to sense the smoke from the fire, so it can be…
Heat Detector + Siren
This is the diagram of heat detector circuit which already integrated with siren circuit in the output. This circuit applies…
Multitone Siren Alarm
Here the simple schematic of multitone siren alarm circuit. This multitone siren is effective for reverse horns, burlgar alarms, and…
Pyroelectric Fire Alarm System
This is definitely an ultra-sensitive fire sensor that exploits the direct piezoelectric property of an ordinary piezo component to recognize…
Adjustable Analog Timer
This is a very simple adjustable analog timer circuit diagram. You can build this circuit just for fun, for newbie…
LPG Gas Leakage Sensor Alarm
This is the schematic diagram of LPG gas leakage sensor alarm. The circuit operates off a 9V PP3 battery. Zener…
Electronic Siren based NE555
Here the circuit diagram of electronic siren based NE555. This circuit produces a sound like factory siren. It applies a…
Beeper Sound
This is the circuit diagram of beeper sound. The circuit will generate the sound of a beeper which similar with…
Easy Build Motorcycle Alarm
The following circuit is a simple, cheap and easy build motorcycle alarm. The circuit just required 2 transistors to drive…