I met Mdm Naza ealier (20/2/2012) to showed her my Arduino buzzer circuit. She asked me the specification for the buzzer(the rated frequency) which I overlooked. So the new task for me is to find the suitable buzzer that can produce sound according to the frequency that I want. Herewith is some of the specification that need to be take into consideration;
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Specifications:
Rated Voltage: A piezo buzzer is driven by square waves (V p-p).
Operating Voltage: For normal operating. But it is not guaranteed to make the minimum SPL under the rated voltage.
Consumption Current: The current is stably consumed under the regular operation. However, it normally
takes three times of current at the moment of starting to work.
Capacitance: A piezo buzzer can make higher SPL with higher capacitance, but it consumes more electricity.
Sound Output: The sound output is measured by decibel meter. Applying rated voltage and square waves, and the distance of 10 cm.
Rated Frequency: A buzzer can make sound on any frequencies, but we suggest that the highest and the most stable SPL comes from the rated frequency.
Operating Temp.: Keep working well between -30℃ and +70℃
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