Hello PattPatt,
I am also trying to build such a PULSER for a mechanical scan Sonar. Could you please share your circuit diagram with me. Did you find the power supplies? Please do share with me what you have accomplished so far. i shall be indebted.

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I am trying to build one PULSER using a MICROCHIP Document/ Development Board MD1715+TC8020. It is attached herewith. Need Gerber Files to get the PCB done by JLC PCB. Any help in this regards would be appreciated.