I found a pair of ultrasound transcivers in my junk box. It is marked with Mitshubitchi logo + EFR-OCB40K2. Ã˜ = 24 mm, L = 9 mm.
Google did not show me any datasheet, and I wonder:
What frequensy might it be? I gues 20 KHz
I will feed it with a dipulse, 1/2 posetive , and then a 1/2 negative sycle. (H-bridge) The voltage should be near the max voltage. What voltage may I try?