Wad, thanks, Tony > > On Jun 1, 2012, at 9:24 PM, [email protected] wrote: > > >> We should test the calibration again. > > Walter, Guzman > > > > Testing with TA140 > > > > It looks like the 1.75 audio circuit was changed between the preproduction > > and the ramp unit 1.75's > > > > Testing on SKU199 and SKU204, the impedance has gone from 1k to 4k and the > > calibration is all wrong on 204 > > > > (TA calibration should be OK for the moment on preproduction SKU199) > > > > Can laptop.org please confirm that there was an audio redesign between > > SKU199 and SKU204? Is the SKU204 design now stable or can we expect further > > changes? > > Yes, there was a redesign which increased the resistance between the Mic > voltage source and the mic jack > from roughly 1K to roughly 3K for improved microphone performance. All > production XO-1.75s use the SKU204 circuitry. > > > Is the input protection the same as the 1.5: "The XO-1.5 is protected by a > > resistor,(1/16W 470 ohm SMD0402) and a pair of diodes to ground and to > > +3.3V which should protect -6V to +9V continuously, and up to higher > > voltages for shorter periods of time." > > http://wiki.sugarlabs.org/go/Activities/TurtleArt/Using_Turtle_Art_Sensors#Specifications > > Yes, the protection circuitry is the same as used on 1.5. > > Chers, > wad > > > _____________________________________________________ > This mail has been virus scanned by Australia On Line > see http://www.australiaonline.net.au/mailscanning
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