This is the fire alarm circuit which use LDR to sense the smoke from the fire, so it can be…
This is the diagram of heat detector circuit which already integrated with siren circuit in the output. This circuit applies…
Here the simple schematic of multitone siren alarm circuit. This multitone siren is effective for reverse horns, burlgar alarms, and…
This is definitely an ultra-sensitive fire sensor that exploits the direct piezoelectric property of an ordinary piezo component to recognize…
This is a very simple adjustable analog timer circuit diagram. You can build this circuit just for fun, for newbie…
This is the schematic diagram of LPG gas leakage sensor alarm. The circuit operates off a 9V PP3 battery. Zener…
Here the circuit diagram of electronic siren based NE555. This circuit produces a sound like factory siren. It applies a…
This is the circuit diagram of beeper sound. The circuit will generate the sound of a beeper which similar with…
The following circuit is a simple, cheap and easy build motorcycle alarm. The circuit just required 2 transistors to drive…
This is a really simple sound effect generator based single sound generator chip UM3561. The UM3561 will generate four kinds…