How to Make a Simple Buzzer?
The circuit design of the electronic buzzer shown is amazingly simple in design and yet is able to produce a sound output that’s quite sharp to the ears. The construction procedure does not require much of explanation, as the whole circuit can be built within minutes with the help of the given schematic and the parts list.
The circuit description given below will surely help you to understand better regarding how to make a buzzer:
As can be seen in the circuit diagram, the circuit uses just one transistor, two resistors, a buzzer coil and a piezo- electric transducer. Here no external oscillator is required to drive the piezo, rather the circuit is a self oscillatory one. To maintain oscillations in an electronic circuit a feedback voltage is always required and here it is received through the centre tap of the piezo (thanks to these simple low cost 3-terminal transducers). The buzzer coil here performs the function of amplifying the low voltage oscillations into high voltage oscillations required by the piezo to create a strong audible tone. The resistor R1 is used just for providing the required biasing to the transistor, where as R2 has been included so that the oscillations do not stall due to overloading of the circuit.
Well, now you just don’t have to wonder how to make a homemade buzzer, as you simply know how to do it.
Piezo image credit:Busytrade.com
Black Cover Image Credit:Ringford.manufacturer