This circuit uses a feedback integrator. We found it in Ferranti's transistor manual from 1974. Transistors are general-purpose types at the time.
This circuit is from a 1986 Revista Española de Electrónica. It consists of an amplifier with...
November 2016 - Maxim's MAX30003, an Analog Front End (AFE) for biopotentials with clinical grade...
The sensor of this circuit is an NTC of 20 to 50 k resistance at room temperature. The circuit is from a...