TEN399 3V1 : Improved OpenSource ADR1399KHZ LM399 10V Ultrastable Precision Voltage Reference

  This is Next 3V1 revision of LM399 ADR1399KHZ based reference board, when i made my last version i received quite few small feedback form users , So I have again made few improvements in This forth version over Third reversion accumulating those suggestions.

Fist improvements is, Board has LT3042 Ultralow Noise, Ultrahigh PSRR RF Linear Regulator To Supply 15V to the ADR1399 and LT1001 , This regulator Offers reverse polarity protection and PG LED.

Board offers Dual Power supply input with a Normal Liner supply input and a USB input with boot converter to use as backup and transport. 

This version has ADR1399KHZ Snubber and also Trim pot has been removed and replaced with multiple resistors with solderable jumper 

There are few minor change in the PCB as well there is great care has been taken in designing slots around the PCB to remove mechanical strain on Chips and reference. Also board has been designed for Testing.  Board also now also have a enclosure. Now on the output side both calibrated 10V and Direct reference voltage is also available as output.

 

Schematic

PCB

Source is available in my Github Repo.