Hello, Here is the difference between TX-SDK-V1 and TX-SDK-V2 : The difference between the TX-SDK-V1 and TX-SDK-V2 is the pulser. V1 is for the LM96551 , which has the floating supplies VPF and VNF built-in (generated internally). V2 is for the LM96550 , which the customer has to apply the VPF and VNF supplies externally. Technically, the TX-SDK-V2 can be used for the LM96551 too as long as one doesn't apply any voltages to VPF and VNF pins. For the LM96551 , the floating supplies are generated internally. The price for the TX-SDK-V1 is $999, and the TX-SDK-V2 is $799 on the web. If you can provide the external supplies to VPF and VNF, you can save the $200 difference. Regards, Hooman
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