- on Home & Garden
- Published in issue 7/2011 on page 40
ATM18 Youth Repellent
The very high-pitched sound at 16 kHz that generated by this project will be unpleasant above all for adolescents and young children whose hearing is still unimpaired. The principal ingredients are an ATM18 board and a sounder connected to PC0 on the ATM18 in series with a 100 Ohm resistor.