Posted by dapj20 on Apr 05, 2020 in Mixed-Circuits, Industrial-Instruments
This circuit changes the gain of opamp U1B in four steps or segments. It can be used to get a linear output from most transducers to 1% levels.U1A is a amplifying buffer use it to boost the signal to the required level.
Temperature Measurement and Control
The resistor values i have put are for an imaginary transducer, you have to design them. The buffered input signal is compared to reference switching points by LM339.