Found in 90's Electronic Engineering this circuit can be used to measure phase angles between two signals from 0 to 180 degrees. The components used admit modern equivalents.
Figure 1 shows how the 4029 can be connected to count up to 10 and also up to 18. If pin 9 is...
In the figure we have a second order filter with very high input impedance, using an operational...
This circuit is from an Italian magazine Radio Elettronica of January 1977. The circuit shows how...