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Topic: Beeping at 200m (Read 2596 times) previous topic - next topic


You could use a -very- small capacitor to change square wave edges to sawtooth.
Just how small though, I am not the person to say.

Cheap 200x audio amp (they have a 20x too) that uses an LM386 chip:

I haven't tested one yet, just got 2 of each.

Nick Gammon on multitasking Arduinos:
1) http://gammon.com.au/blink
2) http://gammon.com.au/serial
3) http://gammon.com.au/interrupts

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