A Wailing Siren Circuit using IC 555 is simple to make sound like real siren, going up and down in pitch. The sound come from 555 IC making pulses at certain speed (frequency). Circuit Working: Parts List: Category Description Quantity Resistors 390Ω, 1k, 220k, 100k, 33k, 22k 1/4 watt 1 each Capacitors Ceramic 10nF 2 […]
Alarm Circuits
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“Hee Haw” Siren Circuit
The “Hee Haw” Siren Circuit is a fun sound project that makes a high and low noise like “Hee Haw” instead of one long sound. It is made using simple electronic parts like resistors, capacitors and transistors or sometimes ICs. The pitch of the sound goes up and down again and again. We can find […]
Fog Horn Circuit
Ever wondered how fog horns make that deep, spooky sound? This Fog Horn Circuit is a small sound-making device. It uses electronics to make the low, rising and falling fog horn noise. People use these circuits for fun projects or to learn about electronics. Circuit Working: Parts List: Component Value/Type Quantity Resistors( All resistors are […]
Simple Light Activated Alarm Circuit
This Simple Light Activated Alarm Circuit is like very sharp nightlight. It have small part called LDR which work like a tiny eye. When light goes away fast like someone is moving near circuit it make sound or light happen to warn us. It also uses other parts like transistors, resistors, capacitors to make it […]
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 […]