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It's just an alarm for beginners on electronics to practice. Whenever given power supply it will generate sound according as the frequency for which it is designed. The frequency depends on the capacitor values and the resistance.

Step 1: Materials

Resistance
Capacitance
Piezo speakers
Op-Amp uA741
Breadboard
Some wire
9v Batteries

Step 2: Circuit

Just connect all the parts as shown in the circuit...

Step 3: Complete Alarm

Just connect your batteries and speaker and it will start to generate sound. Thank you
<p>Really cool little circuit! Thanks for sharing! </p>
Thanks. I uploaded it for those beginners who have little or no exposure to circuits so that they can start building from the very basics.

About This Instructable

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Bio: Electronics & Communication Engineering Student.
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