Hi all, TiN, out of interest I spent ages fishing for low ppm/degC resistors for my own reference......ended up with 2ppm units from DigiKey. Yes, they are expensive and send the BOM into the clouds!..............so I know how you feel! Ian. ----- Original Message ----- From: Illya Tsemenko [mailto:illya@xdevs.com] To: volt-nuts@febo.com Sent: Thu, 26 May 2016 18:42:54 +0800 Subject: [volt-nuts] LTZ1000 project build I'm glad my little project got so much attention. Worth to mention few points regarding my (or any other LTZ1000) unit: A. One should consider cost of whole BOM, not only LTZ chip. In my case resistors from VPG exceed cost of LTZ1000 by far. B. PCB I designed was targeted best to my own application need, where compact size and direct output (whatever is coming out of LTZ) were key importance. Since modules are part of bigger system with DAC synth, specific value, like 7.1500000 was not important for me. C. If there is large enough group to have this project going, I can actually modify original design (e.g. for easier hand soldering, or added buffer or ratio circuits, onboard LDO, you name it) and get PCBs made for interested nuts, at small cost. You can also find lot of temco/stability data with temperature/environment logs with mentioned LTZ modules on my site here: https://xdevs.com/services/ in LTZ1000 voltage reference tests section. RAW DSV data are available. I still have 3 modules at hand for any testing/checks (one was sold while ago, one was installed in HP 3245A source to replace LM399). Illya "TiN" Tsemenko _______________________________________________ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.