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.
This circuit, which can be used as a shield for microcontrollers, provides 50% active cycle output...
We found this circuit in a 1968 General Electric publication. The circuit uses an SCR of the time,...
This circuit allows the division of the frequency generated by an oscillator with the 4069 by two,...