KX » REF-R

Some stuff need to go, to much voltage references around.
For volt-nut enjoyment, offering two modules with Linear LTZ1K for sale.

1. Fully assembled and functional revision board with LTZ1000A (24week 2014).

• 7.13659 VDC output with +23.6°C ambient temp, according to my calibrated Keithley 2001.
• +12...+20VDC input supply voltage. Once settled, consumes about 35mA of current
• LTC2057 chopper amplifiers for both zener and heater sections
• Two MAXIM MAX6610 temperature sensors (one near main opamp, second on bottom side near LTZ)
• Vishay VPG Z202T 0.01% (120R,1K,13K) and VHP203T 70K000 0.1% precision resistors.
• Within 1ppm window from other 4 LTZ references I have according to Keithley 2002
• ~2 month of 24/7 operation, so not much aging

350$USD shipped worldwide.

2. Fully assembled and functional prototype board with LTZ1000 (16week 2014).

• 7.12969 VDC output with +23.6°C ambient temp, according to my calibrated Keithley 2001.
• +12...+20VDC input supply voltage. Once settled, consumes about 35mA of current
• LTC2057 chopper amplifiers for both zener and heater sections
• Two MAXIM MAX6610 temperature sensors (one near main opamp, second on bottom side near LTZ)
• Vishay VPG Z202T 0.01% (120R,1K,12K) and VHP203T 70K000 0.1% precision resistors.
• Within 1ppm window from other 4 LTZ references I have according to Keithley 2002
• Film capacitors
• ~4 month of 24/7 operation

310$USD shipped worldwide.

Prototype board have few bodges and jumpwires, but fully functional.
All parts genuine, bought directly from vendors (LT and Vishay, passives from digikey).

Few blank boards, as well as schematics, gerbers will be included for free to any of reference buyers.
Selling [url=http://www.eevblog.com/forum/projects/project-kx-diy-calibrator-reference-sourcemeter/msg405089/#msg405089]them basically at BOM cost[/url], as need to get resources for other parts.