Electronic-thermometer


Posted on Jan 6, 2013

This circuit uses the +5 V reference output and the op amp to level shift and amplify the 2.1 mV/°C Tempco output into a voltage signal dependent on the ambient temperature. Different scaling can be obtained by selecting appropriate resistors from the table giving output slopes calibrated in degrees Celsius or degrees Fahrenheit. To calibrate, first measure the voltage on the Tempco pin, VTEMPCO. and the ambient room temperature, TA in °C.


Electronic-thermometer
Click here to download the full size of the above Circuit.

Where S = Scale factor for your circuit selected from the table in mV. Then turn the circuit power off, short VouT at pin 6 of the REF-02 to ground, and while applying exactly 100.00 mV to the op amp output, adjust R82 to that V8 = (X) (100 mV). Now remove the short and the 100-mV source, reapply circuit power and adjust Rp so that the op-amp output voltage equals (7A) (S). The system is now exactly calibrated.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Soft Start For Amps
Signal-combiner
ray dialer
Electronic Birthday Candle
Soft Musical Telephone Ringer by UM66T
the monitoring systems of railway level crossing of mining area of Atmega128 one-chip computer and GPRS
jung schematic
project Huminator
Egg Timer
Motor Bike Headlight Controller Circuit
Hijack Alarm
DTMF Decoder
KA7OEI GPS
Electronic projects
Vegetable greenhouse temperature detection control circuit



Top