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Old 10-28-2012, 10:32 AM   #9
knc1
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Posts: 17,212
Karma: 18210809
Join Date: Feb 2012
Location: Central Texas
Device: No K1, PW2, KV, KOA
Quote:
Originally Posted by geekmaster View Post

I also had to remove an LED on my 3.3v USB serial adapter that was supplying too much current for the kindle to sink to a logic zero. I replace the LED with the 22K resistor shown in the circuit at the post linked above. That allows me to use a 3.3v adapter just fine on my K4 and K5. I actually soldered the resistor and diode inside one of my kindles, so that kindle now supports 1.8v to 5v TTL serial.
The Tx and Rx leds of this adapter board are driven by dedicated output pins of the FT232, not by a "parasitic" connection to the signal leads.

The chip on this board is the same one inside of the cable that I recommend.
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