Suggested by an American documentation from the 90s, this circuit generates signals with frequencies determined by the capacitors and calculated by the formula next to the diagram.
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...