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Forum Post: RE: Output impedance of TX-SDK-V2 and power supply board

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Hi Hooman, Thank you for this information! Replacing the load with a single series 50Ohm resistor: the reasoning for doing this is that it would be much easier for me to electrically match the external transducers to a 50Ohm source. I made my own transducers and without any matching they reflect ~70% of the input power. I might be confusing the load impedance with the source impedance, but based on your previous answer, I concluded that the source impedance of the LM96550 pulser by default is defined by the parallel connection of capacitor and resistor. Hence, my idea was to swap out this combination to get 50Ohm source that I can easily match to and deliver maximal power to the external transducers. The impedance of my transducer is Zt = 12.7 - j12.8 (Ohm). Thus, if I remove all other load, the load on the LM96550 would be much less than 2kOhm. Regards, Dmitrijs

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