From: Dave M dgmin...@mediacombb.net
To: volt-nuts@febo.com
Subject: Re: [volt-nuts] Resistors for LTZ1000A circuit
Message-ID: 8ED467935EBC4B82B5DABC46445D8054@D77M7BF1
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I've described the theoretical
Hello Jan,
some shameless self-plugging:
My Website has a ZIP with the eagle schematic and layout of one of the
Circuits discussed on this eevblog thread: I am the babysitter.
http://dg3hda.primeintrag.org/doku.php?id=ltz1000a
Hendrik
Am 11.12.2013 20:43, schrieb Jan Fredriksson:
Hi
I've described the theoretical background and measurements on my
LTZ1000 references (2 on my own, one identical of another volt-nut) parts
#1
-#6, starting here:
http://www.eevblog.com/forum/projects/ultra-precision-reference-ltz1000/165/
Those 0.1% wirewound resistors, are available from
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.
Dave,
well the schematic is the same as in the LT specification.
My PCB is a prototype, and I would not like to publish it, because it
contains several bugs.
One one those bugs led to the first change of the initial LT
specification, i.e. I discovered the parasitic diode in parallel to the
Frank Stellmach wrote:
Dave,
well the schematic is the same as in the LT specification.
My PCB is a prototype, and I would not like to publish it, because it
contains several bugs.
One one those bugs led to the first change of the initial LT
specification, i.e. I discovered the parasitic diode
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
