On 11/12/2013 2:51 PM, joem wrote:
Try this :) it popped up on Google pretty quickly --> http://www.hobbytronics.co.uk/schottky-logic-level-conversion
: awesome. done. added to spec.
Same problem - access to the 3.3V power line inside the EOMA needed.
Anyway - 3rd diagram added - modified version of Henrik's diagram for the EOMA: http://www.gplsquared.com/eoma_boot/eoma_boot.html#uart_repair
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Pardon severe cranial densities here :P but what's wrong with sticking eg a 7803 in there somewhere to provide a little extra 3v3? Well, OK, a 7803 is probably a little more capable than absolutely necessary -- and it's not exactly efficient, either, to say the least -- but something *like* that (low current 3 pin 3v3 regulator) would tidy that little problem up quite nicely, now, wouldn't it? ;)