ASCOM Mount Dither


The review package is updated. I’m also refreshing the project specification to match the corrected PhotoMOS/SPST revision.
The project specification is refreshed to the corrected PhotoMOS version. I’m verifying the final file list and marking the revision complete.
Final ERC/BOM/schematic checks are clean; no PCB placement/routing was started.
Implemented the schematic-only V1 revision: replaced the TLP291-4 with four TLP171A(TP,F) PhotoMOS relays, replaced SW1 with a true SPST ON/OFF switch, preserved the V2 archive, and updated the review docs.
Updated files:
Open items:
  • No PCB placement/routing was started.
  • J1 pin-1 marker and “ST-4 - STRAIGHT 1:1 6P6C ONLY” silkscreen note remain layout-stage tasks.
  • Board outline, connector access, battery-holder position, and mounting method still need definition before placement.
Suggested next steps:
  1. Review/approve the corrected PhotoMOS schematic and BOM.
  2. Confirm SW1 = DS04-254-2-01BK-SMT is acceptable as the physical power switch.
  3. Confirm whether J2 should stay as a 1x03 UPDI header or change to test pads before layout.
Approve and prepare layout
Approve PhotoMOS schematic
Keep UPDI header
Define board outline
Verify RJ12 footprint
Review switch choice

HEM27EC Dither Box

HEM27EC Dither Box thumbnail