[FS] 2 x LTZ1000(A) ultra-zener voltage reference sale, direct output.

[TiN]

Some stuff need to go, too much voltage references around.
For volt-nut enjoyment, offering twoone module 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).





Payment via PayPal only.

Few blank boards, as well as schematics, gerbers will be included for free to any of reference buyers.
Selling them basically at BOM cost, as need to get resources for other parts.

[TiN]

Bump, no one interested?

[codeboy2k]

Bump, no one interested?

I'm definitely interested, and I know you're selling these for BOM costs, without any personal gain (totally worth every penny ! ) but I'm unable to spend $350 right now on anything other than household necessities... so test equipment, toys and other goodies are off my shopping list at the moment. I would definitely buy it if I could.. I read every posting in the thread where you made and tested these, they have a well documented history.

[Zucca]

I am surprised as well nobody has already took them. In my mind I can´t stop thinking on how I could use these beauties, and all I got back are just "maybe" here or there...
I would prefer they will go to someone who really needs them. In my case they will probably end up under the bench with a big hope to use them in some future kick ass projects.

Anyway I am still fighting against my brain... give me some more time as it is surely not a prio 1 thing for me.

PS: TiN every single post you make is a piece of art. Thank you so much for sharing all your hard work. You have all my respect.

[HighVoltage]

I am interested.
Are those PCB's made by you or LT (hence the LT Logo on them...)?

May be I should read the monster thread of the LT1000 first and then I would know it all (hopefully) but no time right now.
Therefor my question: is the LTZ1000A the most long term stable one?

[TiN]

HighVoltage

PCBs are my design. But LT parts are LT's . Not sure if I violated any copyright by putting LT logo there.
As of stability, LTZ is best stuff you can get from market (unless you want pay many thousands for industry standard's from Fluke/etc).
I don't have much long term stability data, since these two modules running 24/7 just for few month since I built them, but you can expect it
to be within few ppm (likely better) a year if conditions are constant (temperature, supply voltage, measurement setup).

If you need any extra details, let me know. Best gear I have here to measure these is Keithley 2002 (which is not best/quietest 8.5d) and calibrated 2001.

Make a note, these modules provide you direct 1:1 reference voltage output, not 10.00000 V, so you will need scale circuit with stable resistors, if you want get 10.0000/whatever VDC outputs. It was intentional design choice to reduce amount of sources of errors/drift, and fit my application since I plan use these as DAC references.

zucca
They are still here, waiting for lucky owner. I wanted to have them go someone who do something useful, so did not list them on ebay yet.
We all here just to share our engineering endeavors, no problems.

[JohnnyBerg]

PCBs are my design. But LT parts are LT's . Not sure if I violated any copyright by putting LT logo there.

You put me on the wrong leg there ..

expect it
to be within few ppm (likely better) a year if conditions are constant (temperature, supply voltage, measurement setup).

 

[TiN]

Bump last time

[Zucca]

PM sent

[TiN]

Black LTZ1000A Ref pending ... 

[blackdog]

Hi Group, :-)

Sorry Wrong topic...

Blackdog

[TiN]

Emm, I do enjoy your designs and presentation, but does this really belong in Buy/Sell topic? 
I'd suggest to post to LTZ1000 thread, or my KX thread in projects, rather than here.

I'll take it as a bump, but nevertheless...let's keep forum in order. 

Btw, LTZ1000A black sold, last one, red one, anyone?
If nobody want I will sacrifice it and use it in one of my K2001's to replace LM399

[blackdog]

Hi TiN, :-)

My Bad, you see, i get lost in all the LTZ1000x topic's 

I will remove the post from this topic, sorry.

Kind regarts,
Bram