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.
Recommended for automotive use, this circuit is used to indicate the activation of functions. The...
This very high input impedance preamplifier is from a publication of 1977 but can also be mounted...
This circuit was found in a Popular Electronics of the 90s. The resistor R4 determines the load...