Replacement PCBs for Keithley 615, and custom external interface board

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Peter Farley 6ea708a439 DNI R31 from PC209 This resistor prevents sensitivity 2x10^0 from hitting the proper logic levels.		2023-11-03 14:12:41 -05:00
50PinTestBoard	50PinTestBoard: Rev 1.2	2023-02-04 21:08:06 -06:00
doc	InterfaceBoard: Add PCB/SCH PDFs.	2023-03-04 08:42:06 -06:00
img	Update board images	2023-03-30 19:01:34 -05:00
InterfaceBoard	InterfaceBoard: Add PCB/SCH PDFs.	2023-03-04 08:42:06 -06:00
lib	Fix 50-pin connector pin numbering.	2023-02-04 21:04:51 -06:00
PC209	DNI R31 from PC209	2023-11-03 14:12:41 -05:00
PC218	PC218: Make library path relative	2023-02-01 06:27:42 -06:00
PC218v2	PC218v2: Make library path relative	2023-02-01 06:28:14 -06:00
.gitignore	InterfaceBoard: Update connector footprint	2023-02-05 14:08:44 -06:00
LICENSE	Add images of boards, update README, add LICENSE	2023-01-10 19:41:46 -06:00
README.md	Update board images	2023-03-30 19:01:34 -05:00

Keithley 615 Electrometer Printer Board Recreation

This repo contains modern reproductions of the buffer/printer PCBs (PC209, PC218) for the Keithley 615 electrometer.

Boards

PC218
- Signal inverter/buffer board
- Recreation of the origional PC218 schematic using modern SMD components is in the PC218 directory
- A simplified version using more modern ICs can be found in the PC218v2 directory
PC209
- Signal inverter/buffer and trigger board
- Simplified version of the origional board can be found in the PC209 directory
  - Same inverter/buffer scheme as PC218v2, with the origional trigger pulse generator and logic reduced down to discrete transistors, to simplify design.
Digital Interface Board
- This will be a new board designed to connect to the 615 via the 50-pin Centronics connector
- Planned features:
  - Passive data collection
  - Active triggering
  - USB-serial
  - RS-232 via DE-9
  - Ethernet

PC218 v2.2:

PC209 v1.0:

Interface/network board v1.0:

50-pin test board v1.0: