Using popular IC 555 we can make Electronic Horn Circuit for cycle, alarm or fun use, as this Electronic Horn Circuit using IC 555 and one 8Ω speaker makes loud horn sound for car or alarm. Furthermore, one 555 IC work as astable multivibrator which means it make square wave by switching high and low […]
Alarm Circuits
Simple Door Open Alarm Circuit using Reed Switch
Simple Door Open Alarm Circuit using Reed Switch uses reed switch which makes alarm sound when door opens; this simple circuit help protect door from people not allowed. Also, it have reed switch, transistors, resistors, buzzer, diode and LED and here, reed switch control power to alarm. Circuit Working: Parts List: Components Values Quantity Resistors […]
Wailing Siren Circuit using IC 555
A Wailing Siren Circuit using IC 555 is simple to make sound like real siren, going up and down in pitch, also the sound come from 555 IC making pulses at certain speed (frequency). Circuit Working: Parts List: Components Values Quantity Resistors 390Ω, 1k, 220k, 100k, 33k, 22k 1/4 watt 1 each Capacitors Ceramic 10nF […]
Low Battery Indicator with Buzzer Circuit
To begin with, this Low Battery Indicator with Buzzer Circuit is very simple and uses basic idea and few parts. Buzzer make sound when battery is low and warn us and it help us to know when to change the battery so device do not stop suddenly. Circuit Working: Parts List: Components Values Quantity Resistors […]
“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. Also, simple electronic components such as resistors, capacitors, transistors and sometimes ICs make up the circuit. The pitch of the sound goes up and down again and again and we […]
Fog Horn Circuit
Ever wondered how fog horns make that deep, spooky sound? In the same way, this Fog Horn Circuit is a small sound-making device that uses electronics to produce the low, rising and falling fog horn noise. Moreover, people use these circuits for fun projects as well as for learning electronics. Circuit Working: Parts List: Components […]