We getting a tad better echoes, and we have the proof that there's some action at the TGC level =)

Observations

• At 50V, we observed interesting echoes from the 4MHz transducer. An echo at 82us means that there was an obstacle at (1540*82e-6)/2, that's 63mm away from the transducer... where we put a reflector! Success.
• Echoes before and after the MD0100 are basically the very same. No attenuation. With the jumper on on J1 (TGC), on the high amplification, we do see the signals on P2/P3. But nothing after, on P5/P6. That would translate in a signal on P7.
• Just behind the MD100, there's a +-10V swing, which is completely attenuated by the CL component just behind it, to avoid to fry the TGC.

Issues

• The pulser is still an issue.
• Inverter is quick enough for our needs

More details on the github log of the project, and of the session.