[volt-nuts] Datron 4910 components

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Thanks Frank, much appreciated!

Steve
WB0DBS



On Aug 20, 2013, at 4:27 PM, Frank Stellmach <frank.stellmach at freenet.de> wrote:

> Steve,
> 
> yep, it's in the LTZ100 thread.
> We discussed intensively the sense or nonsense of those slots in the Datron PCB design, which is very often (blindly) copied by others...
> 
> Mickle T. contributed the already known schematics and he measured all resistor values of the Vishay array.
> 
> Then, quarks simply added a schematic of this array, which he received directly from Vishay, obviously.
> 
> So, Datron used 21 Ohm in series with the Zener for better T.C. (originally 50ppm/K), 9k/659 as initial divider for temperature regulation (altered by the external temp. PWM), 128 Ohm for the Zener current, 39k as collector resistor for the reference transistor.
> 
> There's no complete schematic yet, but now it's possible to finalize that.
> 
> Here's the link:
> 
> http://www.eevblog.com/forum/projects/ultra-precision-reference-ltz1000/300/
> 
> Frank
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