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Sylvain Munaut 246tnt at gmail.com>> > However, I think there's one pretty serious problem in the hardware >> > design: The bus switch has something like at least 5 (rather 16Ohms) of >> > internal 'on' resistance between the sim card and the phone. While this >> > _might_ still work for I/O, nRST and CLK lines, it definitely doesn't >> > fly for the supply voltage (VCC). Why not just keep the bus switch IC for the signals. ( ~ 20 ohms won't be a problem for sure ). And use any PMOS with a pullup for the VCC switching ? Or you can even get fancy and use a dedicated load switch like the TPS22960 . Cheers, Sylvain