[time-nuts] Diodes as temperature sensors
albertson.chris at gmail.com
Sun Jul 20 23:18:19 EDT 2014
On Sun, Jul 20, 2014 at 7:07 PM, Al Wolfe <alw.k9si at gmail.com> wrote:
> Seems like there are IC's that contain two diodes, one as a sensor and one
> as a heater. Part numbers escape me now.
You might mean the TMP36 family of sensors. They use diodes and must be
the most common sensor out there. They are cheap and ultra-easy to use.
But when I tried to use one to measure an FE5680 Rubidium oscillator I got
a LOT of noise. I had to take ten or more reading and average them. Then
I use shielded cable and place an RC filter near the sensor with only
slight improvement. Likely I'm still making some kind of design error.
But I moved on to one with a digital I2C output and it worked better. I
was trying to moderate the fan speed to keep the Rb at constant
temperature. The fan controller works well enough now.
Here is a really good write up from the place I bought mine from
Redondo Beach, California
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