Re: Converting a NTC voltage into temperature in Celcius

On 4/11/2025 5:47 AM, Gerhard Hoffmann wrote:

Am 11.04.25 um 08:13 schrieb Bill Sloman:
 

Whether a reverse biased diode breaks down in Zener mode or avalanche mode depends entirely on the diode you have selected.
>
if it breaks down at less than 5V reverse voltage it is breaking down by the Zener mechanism (with a negative temperature coefficient) , and if it the breaks down at an 8V or a higher reverse voltage the avalanche mechanism is dominant (with a positive temperature coefficient.

 Noisewise, the mode is easy to be seen. The avalanche effect is MUCH
worse. Already small avalanche contributions spoil the pot.
 in
 < https://www.flickr.com/photos/137684711@N07/24411798996/in/album-72157662535945536/    >,
 I have measured the NXP BZX84 family. The 2V7 or 5V6 in the type number
mean exactly that. At 4V7 the low noise property is already gone.
 The pics to the left & right show some LEDs and regulators.

Nice. Thanks for posting that.

 BTW: the leftmost pic of the peaceful Blau river valley is where the
Gauss family runs a hotel. Yes, "our" Mr. Gauss. They have an oil
painting of him in the dining room.
 ??? of him / of his: which one is correct?????

If the picture shows what Mr. Gauss looked like, it is a painting
of him.  If Mr. Gauss painted a picture it is a painting of his.
It gets even more complicated if Mr. Gauss painted the image of
himself - a self portrait.  Then it would be his picture of him.
Groan.
Reminds me of a Japanese lady who learned English and had a
hard time with prepositions: do you ride in a bus or on a bus;
why do you sit on a stool but in a chair (sometines on a chair)
but you sit on a sofa, not in a sofa etc etc  I helped her
with that, but when she asked me to explain PIN diodes to her
I couldn't.
Ed

 BTW2: For the sake of scientific honesty, Prof. Zener sued the semi
industry that they should not use his name for avalanche diodes.
They settled to call them Z-diodes and to pretend it was for the
form of the U/I curve.
 cheers, Gerhard