update Notebook text regarding 12V up-converter

[hw/telelco] / Notebook

diff --git a/Notebook b/Notebook
index a83143555991d982404efe84794e02eb74dfa8c6..0cc11283591154a580a4a2be10a5dead1c858039 100644 (file)
--- a/Notebook
+++ b/Notebook
@@ -11,7 +11,8 @@ connect all of them to pin 4, the gpio driving the circuit.
 
 The net effect is that we're making 12V from the gpio, which means all the LED
 current and switcher inefficiency is coming as current through that gpio.  The
-measured LED current is around 7mA, so this is "safe" for the SOC, but really
-not a great plan... 
+measured LED current is around 7mA, so this is "safe" for the SOC, but leaves
+less engineering margin than we usually like.
 
-Need to redesign this in the future to use a transistor/FET switch.
+Changing the circuit to be powered from v_lipo with the gpio hooked to shdn*
+and controlling a FET switch on the output might be smarter someday?