PT-100 Body Thermometer

* Constant current source LM334 with Rset=68R provides 1mA through the PT-100 element * PT100 varies between 100-138.5R in the range 0-100 OC * The voltage drop across the PT-100 can be measured on pin#3 of the op-amp OP777 (approx. 108mV at room temperature). * The reference voltage (108mV) on pin #2 of OP777 is set with potentiometer P1 (voltage parts) * Output voltage of OP777 (pin #6) is adjusted with potentiometer P2 (gain) and is less than 10V at temperature below 50 OC (signal limit on the AD board)

Apr 13,2023
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PCB
HDI PCB
Assembly
FPC/
Rigid-Flex
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2 Layers
1.6mm
CNC
Machining
Sheet Metal
3D Printing
Injection
Molding
Aluminum
Aluminum
Resin
ABS
Romuald Bernacki View Profile
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