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Kevin Redon kevredon at mail.tsaitgaist.infoHi, On 17.06.2011 10:23, Harald Welte wrote: > 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). how about using SN74CB3Q3244 or equivalent ? it has max 9 Omhs Ron. Regards, Kevin