2 layers34 × 25 mm

Reference board
TU-Darmstadt-APQ/Voltage_reference
LM399/ADR1399 based 10 V/15 V sub-ppm stable reference
21 parts6CERN-OHL-W-2.0
Boards in 2 GitHub repositories, designed in KiCad, that use the LT1001CD by Texas Instruments (-4V~22V 0℃~+70℃ 1 1.5uV/℃ 126dB 18nV/√Hz@1MHz 250V/ms 400pA 4nA 60uV SOIC-8 Operational Amplifier). See how each wires it, with its parts, size, README and files; the LT1001CD’s symbol, footprint and pinout are on its own page.

TU-Darmstadt-APQ/Voltage_reference
LM399/ADR1399 based 10 V/15 V sub-ppm stable reference

IndexAsm/LM399-Voltage-Standard
10V Voltage Standard used to calibrate equipment.