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Topic: Beeping at 200m (Read 4439 times) previous topic - next topic

GoForSmoke

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:
http://www.lctech-inc.com/Hardware/Detail.aspx?id=f298dfcb-b19f-4318-9169-51a2bba26b6c

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

1) http://gammon.com.au/blink  <-- tasking Arduino 1-2-3
2) http://gammon.com.au/serial <-- techniques howto
3) http://gammon.com.au/interrupts
Tasking: techniques make the trees, the sketch is the woods.
See the woods and the trees, comment both.

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