This circuit allows you to read resistors up to 20 M ohms, converting it into voltage. The circuit is from the 90s. The operational ones used admit modern equivalents.
The circuit illustrated in the figure can be used to detect earthquakes or vibrations of...
Found in Electronics now, this circuit generates signals given by the formulas next to the...
This circuit is suggested by American documentation from 1970. It makes use of transistors of the time...