This is a project I want to do purely for the learning experience. I want to use a standard off the shelf transducer like the Lowrance HDI dual 83/200 KHZ depth and temperature sensor. Here is an info page for it. The sensor basically has a ground and +/- pins for the depth transducer. If I understand correctly it uses the same ceramic for both transmit and receive. I have no problem with just selecting one of the two frequencies (83 KHZ gives better depth and wider beam, 200 KHZ more detail).
I will utilize a microcontroller to generate the signal, receive the signal, and display the results. I will power the circuit from a 12V battery. I know I'll need an amplifier to drive the transducer and a filter / amplifier to receive and condition the signal for the A/D on the micro. One area I am not sure how to handle is decoupling the transmitter to transducer verses the receiver.
I will utilize a microcontroller to generate the signal, receive the signal, and display the results. I will power the circuit from a 12V battery. I know I'll need an amplifier to drive the transducer and a filter / amplifier to receive and condition the signal for the A/D on the micro. One area I am not sure how to handle is decoupling the transmitter to transducer verses the receiver.