This is the circuit diagram of emergency light included the alarm circuit to show you that there is no power source in your building due to shutted down or short circuit. When the electric in your […]
Category: Alarm
This is the collection of alarm schematic diagrams at circuitdiagram.net. The alarm provides a warning tone when an event takes place, for example: thefts, fires, and other events that are not normal. Alarms have the capability of causing a fight-or-flight response in humans; a person under this mindset will panic and either flee the perceived danger or attempt to eliminate it, often ignoring rational thought in either case. A person in such a state can be characterised as “alarmed”.
Multitone Siren Alarm
Here the simple schematic of multitone siren alarm circuit. This multitone siren is effective for reverse horns, burlgar alarms, and many others. It generates five various audio tones and is much more earcatching than a single-tone […]
Wailing Alarm Siren
Here is the wailing alarm siren circuit diagram: Components List: R1,R5___________ 4.7K R2______________ 47K R3______________ 10K R4______________ 100K Rx______________ *see text C1,C4__________ 100uF/25V, electrolytic C2,C3__________ 0.01uF (10nF), ceramic T1_____________ 2N3702 (NTE159, TUP, etc.) IC1,IC2________ LM/NE555, MC1455P, […]
Car Headlight Alarm
Here is the circuit diagram of car headlight alarm. This device can be set for one or two functions: First, to indicate that the head lights (or the side lights) should be switched off after switching […]
Car Alarm Simulator
This is a car alarm simulator which using the LED as a simulation output. This simple circuit can tell you whether your car is running or not by detecting the voltage difference when the car is […]
Safer Security System Alarm
Here the circuit diagram of safer security system alarm. There are 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 […]
Electronic Bird Chirp Sound Generator
This is electronic bird chirp sound generator circuit which used to produce a sound like bird’s chirp. The transformer is a small audio transformer, type LT700. The primary is center tapped with an impedance of 1Kohms […]
DIY Simple Multitone Alarm
Here is the circuit diagram of simple multitone alarm. This is a low cost circuit which is simple and easy to build. The main components of this circuit is based on dual op-amp MC1458 and LM […]
Simple Electronic Siren Based LM358
This is a low cost, simple, yet a surprisingly powerful electronic siren powered by just a 9V battery. The circuit may provide the final circuit block module in an alarm circuit using a relay to activate […]
12 Stage Water Level Indicator
The is a simple and versatile 12 stage water level indicator circuit which will show you the current water level in the tank. This circuit can be used for general purposes. This circuit generates an alarm […]