Thermocouple-preamplifier


Posted on Dec 28, 2012

The MAX420 is operated at a gain of 191 to convert the 52 p.VI o C output of the type J thermocouple to a 10 mV/°C signal. The -2.2 mV/°C tempco of the 2N3904 is added into the summing junction with a gain of 42.2 to provide cold-junction compensation. The ICL8069 is used to remove the offset caused by the 600-m V initial voltage of the 2N3904.


Thermocouple-preamplifier
Click here to download the full size of the above Circuit.

Adjust the 10-KO trimpot for the proper reading with the 2N3904 and isothermal connection block at a temperature near the center of the circuit" s operating range. Use the component values shown in parentheses when using a type K thermocouple.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Bridge-transducer-amplifier
Electronic-music
Outdoor Light Controller Circuit
GSM CELL PHONE JAMMER SCHEMATIC
50MW Audio Amplifier circuit
Two-Position Dimmer
Spark Transmitter Circuit
Motionless Electromagnetic Generator (MEG) Free energy
TDA1510 Power Amplifier Applications 02
555 fall means a circuit diagram for help
BE-150 mainframe computer switching power supply circuit
Jog shuttle function with automatic control circuit



Top