I'm using a digital pin to create a 1khz wave. The problem is that its a square wave and it has harmonics. I can hear the harmonic on my radio even in fm band > 90mhz. I'm trying to use a passive rc low pass filter but it seems it doesn't have any affect. Is there a way to create a wave that doesn't…

Harmonic filtering

MarkT November 25, 2013, 10:28pm 8

Can you clarify what you are doing with the 1kHz signal? What is this "small transmitter"?

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