This circuit was found in a 1967 US documentation. It shows how to build a gain control by digital signals. The circuit can be used as a shield. FET can be a modern equivalent.
Found in an 1868 Mullard documentation this circuit has a dynamic range of 10 Hz to 25,000 Hz....
Schmitt Triggers convert a signal of any waveshape in square signals or pulses. The circuit shown...
This amplifier is from a 1990s Linear Technology component manual. The circuit requires...