Beeper circuit & Application. #electronic #experiment #diy #electronic

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🛠️ “Let’s build a simple piezo beeper circuit using a BC547 transistor.


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🔹 Start with the collector connected to the positive terminal of the piezo buzzer and also to one side of a 20 millihenry coil.

🔹 From the coil, connect a 100 kilo-ohm resistor to the base of the transistor.

🔹 Then connect a 220 kilo-ohm resistor from the base to the positive power supply.

🔹 Place a 100 microfarad capacitor from the positive supply to the junction between the coil and the 100k resistor.

🔹 Use a 1N4007 diode between the power lines—cathode to +V, anode to ground—for reverse polarity protection.

🔹 Finally, connect the negative terminal of the piezo and the emitter of the transistor to ground.

🔊 Power it up — and your piezo will beep using a simple oscillation loop!

💡 Try changing the capacitor or coil to modify the sound!

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