2 Aug
2015
2 Aug
'15
9:42 p.m.
From: spacewar at gmail.com
On Sat, Aug 1, 2015 at 5:52 PM, dwight <dkelvey at hotmail.com> wrote:
The one I had to replace on my Nicolet oscilloscope was made by
Lambda. I don't recall the reference voltage but I did have to change
the feedback resistors to get it to work.
I could dig up the schematic if you are interested more.
The Lambda one had failed. It was in a can and I could not get the
same reference voltage so made the resistor change.
Dwight
There we two different reference voltages on
723s. I don't recall which
was which but one had to change the feedback resistors if you used the
wrong one.
There's a reference with a built-in current source and amplifier,
which outputs on pin 6 on the DIP. That's the one that's specified as
7.15V ?0.35V.
The 723 in DIP also has a 6.2V zener diode in series from the
regulator output. It's not bonded out in the metal can package.
I've never found a 723 datasheet that gives a different values for
either reference.