# HG changeset patch # User Mychaela Falconia # Date 1631773595 0 # Node ID e4eebf9ffce37b75de8305117fb8a50b2ceedf22 # Parent eb68975e1b812b527ea06d8bcd21e4e1f1fa0569 FC-handset-spec: Vf=2.9 V on both HaoRan and Formike LCD modules diff -r eb68975e1b81 -r e4eebf9ffce3 FC-handset-spec --- a/FC-handset-spec Thu Sep 16 00:08:00 2021 +0000 +++ b/FC-handset-spec Thu Sep 16 06:26:35 2021 +0000 @@ -208,9 +208,9 @@ LCD module where the 3 LEDs are joined at the anode, with the 3 cathodes brought out separately. LCD module datasheets call for 15 mA current through each LED at maximum intensity, for 45 mA total, and the LED forward drop voltage (Vf) at -this rated current seems to range between 2.9 V (what I actually measured on one -candidate LCD module) to 3.2 V (what the datasheets list as typical) to perhaps -as high as 3.4 V (what one datasheet lists as the maximum). +this rated current seems to range between 2.9 V (what I actually measured on +both Formike and HaoRan LCD modules) to 3.2 V (what the datasheets list as +typical) to perhaps as high as 3.4 V (what one datasheet lists as the maximum). Given the parallel (as opposed to series) wiring of the 3 LEDs and the relatively low Vf, there is no need to use any kind of boost converter as part