To restate and clarify the problem: I want to use an acoustic transducer to transmit and receive data via pressure waves. The transducer I have transmits a 40 kHz carrier wave, and can be driven by up to 20 V. That means that when transmitting, the circuit must alternate a 20 V signal back and forth between the transducer’s two input pins, once every 25 microseconds. Additionally when receiving, the transducer’s output signal needs to be amplified into a usable signal. Continue reading
Digikey sent me a bunch of LM395T power transistors instead of 20 V regulators. Oh no! I don’t know who to trust any more.
Update Nov 15 – they let me keep the transistors and quickly dispatched a new set of regulators. Thanks Digikey!