frequency generator

cool-agent said:

Hi, does any body knows how to gnerate a high frequency. AT the moment I am using astable circuit and 555 timer to generate frequency but I am not sure if it is generating high enough ON time is very little 0.6us and off time is about 9.2us. and my teacher is saying is that it. do u think using astable frequency gnerator I could generate ultrasonic frequency and scared some anaimals as every 1 knows they feel pain in a very high frequency.

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