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I want to measure the temperature with PT100. At the first stage the resistance is converted to voltage (ca in range 1.5-2 V for 0°C 100°C). How can i scale this voltage to range 0-3.3V with the second opamp (red box)? I want to have 0.3V for 0°C and 3V for 100°C.

Circuit diagram

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  • \$\begingroup\$ Hej, Emire, zemljače, šta ima? :D This is the classical level shifting and scaling with op-amps type of deal. Are you able to modify parts of this circuit prior to the IC16a (3rd op-amp)? \$\endgroup\$ Apr 9 '20 at 13:01
  • \$\begingroup\$ I would strongly suggest a dedicated IC for this. Reason being, the discrete approach will be highly temperature-dependent unless carefully designed. \$\endgroup\$
    – rdtsc
    Apr 9 '20 at 13:04
  • \$\begingroup\$ @EdinFifić Pozz zemo. Yes, the parts could be changed. \$\endgroup\$
    – esehic
    Apr 9 '20 at 14:01

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