opening
cat opening the frigde
presenting: ultrasonic bath
test 1: ultrasonic bath
presenting: pest repeller
test 2: pest repeller
teardown: pest repeller
presenting: dog trainer
test 3: dog trainer
teardown: dog trainer
how it works: dog trainer frequency
turning the dog trainer potentiometer
scientific publications about human and cat hearing
psycho-acoustic test
psycho-acoustics and conclusion
presenting: range detector
how to use: range detector
how it works: rande detector
range detector power measurement
presenting: motion sensor
how to use: motion sensor
power measurement: motion sensor
how to use: piezo-element
how it works: piezo-elements
how to: drive a piezo-element
experiement: hearing range
experiement: 8 kHz
experiement: 9 kHz
experiement: 10 kHz
experiement: 11 kHz
experiement: 12 kHz
experiement: 13 kHz
experiement: 14 kHz
experiement: 15 kHz
experiement: 16 kHz
experiement: 17 kHz
experiement: 18 kHz
experiement: 19 kHz
experiement: 20 kHz
cat repeller construction
power measurement: simple setup
power measurement: sleeping micro-controller
power measurement: remove LED
power measurement: with batteries
installing the cat repeller
closing