Hello Randy,
another source could be the UPW50 or UPW25 series of wire wound resistors.
Some values are available at RS-Components.
the 70K = 50K + 20K
the 12,5K = 10K + 2K + 500R (50 degrees setpoint temperature)
another possibility is the trimming service of DigiKey for VSMP resistors.
http://www.digikey.de/product-search/de/resistors/precision-trimmed-resistors/66806?k=vishay%20metal%20foil
You can get every value within 4 ohms - 120K.
the only disadvantage is that there is only little mechanical decoupling
against PCB stress of SMD devices.
With best regards
Andreas
Am 10.12.2013 04:01, schrieb Randy Evans:
Does anyone know a good, hopefully low cost, source for the precision resistors
required for the LTZ1000A circuit as shown in the LTZ1000A data sheet. I found
the 1K and 120 ohm .01% resistors on Mouser but no source found for the 13K and
70K .01% resistors. Vishay is quite expensive but i haven't contacted them
directly.
Thanks,
Randy Evans
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