A simple electronic circuit that mimics the sound of a genuine siren with a rising and falling pitch is a wailing siren circuit that uses a 555 IC. The pulsating sound is produced by using the oscillation of the 555 IC at a certain frequency. Circuit Working: Parts List: Category Description Quantity Wattage Resistors 390Ω, […]
Alarm Circuits
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Simple “Hee Haw” Siren Circuit
This special electronic circuit makes a sound like a siren, but instead of a steady wail, it goes high low high low in a repeating pattern kind of like saying “Hee Haw.” It is like a fun siren sound you might hear on a cartoon! Circuit Working: Parts List: Component Type Description Quantity Resistors(All resistors […]
Simple Fog Horn Circuit
Ever wondered how fog horns make that deep, spooky sound? A fog horn circuit is like a tiny sound machine for fog. It uses electronic parts to create that classic low moaning sound that rises and falls in pitch. These circuits are mostly used for fun DIY projects to make a fog horn sound effect, […]
Simple Light Activated Alarm Circuit
This Light Activated Alarm Circuit is like a super sensitive nightlight. It uses a special light sensor LDR that acts like a tiny eye. If it gets dark suddenly like someone might be sneaking around, the circuit triggers an alarm buzzer, light etc to let you know somethings up. This circuit uses other parts transistors, […]
Simple Freezer Alarm with Buzzer Circuit
Simple Freezer Alarm with Buzzer Circuit is like small guard for our ice food. It uses one sensor, thermistor to check cold level. If freezer become warm too much then buzzer makes loud sound to tell us something is not right. Like food is going to melt. With this indication we can do something fast […]
Simple High Temperature Alarm Circuit using IC 555
Simple High Temperature Alarm Circuit using IC 555 uses one special chip called IC 555 which works like a temperature guard. It keep checking temperature always. If its too much hot it make alarm sound like buzzer and tell us something is getting too hot. So we can know early and fix before big problem […]