I found this old post on another forum
<<a 38 KHz ultrasonic "BEEP", which humans cannot hear, using a signal generator and a piezo horn speaker,>>
Can someone tell me, in layman's terms, how to build one of these?
Would it be expensive? Is this stuff I can pick up at Radio Shack?
<<a 38 KHz ultrasonic "BEEP", which humans cannot hear, using a signal generator and a piezo horn speaker,>>
Can someone tell me, in layman's terms, how to build one of these?
Would it be expensive? Is this stuff I can pick up at Radio Shack?