[time-nuts] 2.5V reference IC in HP E1938 oscillator.

Richard (Rick) Karlquist richard at karlquist.com
Sun Nov 9 17:53:15 EST 2014


Hi, I was the designer of the board, but I don't remember the
part number of the reference.  I will try to consult my paper
schematic when I get a chance, if no one else can help you.
I do remember that I originally used some convenient reference
which seemed OK from the data sheet, but turned out to be
too noisy.  I changed it to a different one.

When asking questions such as this, it is helpful to know why
you need to know the part number.

Rick Karlquist N6RK

On 11/9/2014 12:54 PM, Rob040 . wrote:
> Dear time-nuts,
> Can anyone enlighten me by telling which IC has been used for creating the +2.5V reference voltage on the oscillator board of the E1938?It's the only IC in the diagram where the type number is not mentioned. In a post of years back I found LT1121, but that one is a voltage regulator and is used on the control board.
> Cheers! 		 	   		
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