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.
+
+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?
+
+2019.12.09
+- what gets through-hole soldered on to a v2.1 board (sans optics)
+
+ 6-pin micromatch with locking ears
+ 2 * 9-pin screw terminal strips
+ 5x1 100mil straight header
+ beeper
+ LiPo connector
+ edge-launched SMA
+ 2x1 100mil right-angle header
+
+2023.02.10
+- the LCD digits we've used, Lumex LCD-S101D14TR, are only available now if
+ we're willing to order 3150 pieces at !.85 each or $5,827.50. That's just
+ not reasonable when we only need 3 per unit and a big build might be 35
+ units!
+
+- DK and Mouser both have the Varitronix VI-611-DP-FH-W in stock. This is a
+ 6-digit LCD display whose digits are 25.4 mm tall instead of 34.54. This
+ LCD module would require the PCB width to grow an inch in width to 5.5
+ inches. A quick look at the FreeCAD file suggest this is manageable without
+ a complete re-design of the panel. By using the panel to only expose 3 of
+ the digits, we could mimic the existing functionality. At $16.27 for q5
+ and above from Mouser, this seems like a credible way of making more TeleLCO
+ in 2023?
+
+2023.02.15
+- we should have 31 SOC left after TeleMega v6.0 build if all goes well, which
+ means we should target a batch size of 30 boards.
+
+- 1170NF in orange is hard to get. The part number is 1170-001-150.
+ mteagleent.com seem willing to sell me 30 pieces for $1,520.40 plus $15.00
+ shipping. Pounce on it?
+
+2024.02.17
+- Keith thinks we should move (back?) to USB mini B for TeleLCO, and suggests
+ we deliver:
+ https://www.mouser.com/ProductDetail/172-PX0446
+ https://www.mouser.com/ProductDetail/172-PX0441-2M00
+ https://www.mouser.com/ProductDetail/157-PX0484
+
+- Pelican 1170 orange is no longer available without foam. Amazon has a good
+ price for modest quantities once you include shipping. Set up tax-exemption
+ with Amazon in anticipation of using them for stuff like this, and ordered
+ one unit to package my proto board.
+
+- Avnet has the 12-click-per-rotation shaft encoders for a price at q30 that
+ DK and Mouser only offer on q100 of the 16-click-per-rotation units, but
+ they aren't stocked and have 16-18 week delivery times. Since it's "only"
+ about $100 total difference on 25 pieces, do we really care?
-Need to redesign this in the future to use a transistor/FET switch.
projects / hw / telelco / blobdiff