This is an LTZ1000-based 7V reference.
- Used larger pads on the TO-99 footprint (easier to solder).
- Moved the input and (buffered) output caps directly onto the board.
- The board is slightly smaller and fits within a TEKO 371.16 enclosure.
- The chassis-ground jumper has been removed (these can now be linked with a small wire).
- The center pin of the R4/R5 divider has been exposed ("T SET") for off-board manipulation.
- The LTC2057 shutdown pins have been exposed for off-board control.
- The "b" variant has been merged back into a single board design (R4, R5 and R45 are now all on the same board design).
- The LTC2057 shutdown pins are now left floating.
- v2.2, v2.2b
- 2.2 uses a single divider footprint (called R45) for R4 and R5.
- 2.2b uses separate footprints for R4 and R5.
- An output buffer was added (LTC2057).
- A mistake was made with the LTC2057 shutdown pins which will result in self-heating of a few degrees in the LTC2057. The work-around is to disconnect pins 1 and 8 of the LTC2057.
- Added a jumper to optionally link GND to a chassis standoff.
- Used smaller capacitor footprints.
- Exposed the star ground as a solderable terminal.
- Switched D1 from a 1N4001 to a 1N4148.
- Used smaller footprints for D1 and D2.
- Andreas capacitor C15 was accidentally left off of this board design. This cap isn't critical, but a work-around is to bodge a 0.1uF cap across pins 5-6 of the LT1013.
- Switched to a simpler, 2-layer, 50mm x 50mm board design.
- First design. 4-layer with via stitching for a mild EMI shielding effect.
- This board was never ordered and tested.
Andreas' original schematic: png
My adapted version of Andreas' schematic: pdf
You can order a copy of this board from OSHPark: link