This circuit was found in a Popular Electronics documentation from the 90s. It is possible to switch the frequency of an oscillator by voltage. The circuit can act as a shield.
This is the traditional configuration for a limit comparator or window comparator, using two...
This circuit is connected to the sum key of a common calculator. Adjusted to produce a pulse per...
This circuit is from a 1980s Signetics documentation. The circuit separates the modulation signal from a...