How can I make a simple ultrasonic dog repeller?
I have been chased by some neighborhood dogs while biking in the last few months, and I need some defense. I don't like the mace or whatever sprays, and I certainly don't want to hit them with anything. I know there are some ultrasonic gizmos but they are awfully expensive. I have found some ultrasonic (25KHZ and above) transmitters at Mouser, and I was wondering if anyone could help with how to make my own portable dog stopper.
Please Save My Ankles!