Found in a Popular Electronics from the 90s, this Wien bridge oscillator uses a single-source operating. The frequency can be calculated from the formulas in the previous circuit.
This circuit was found in an old documentation from 1968. The voltage gain is 70 and the...
This circuit was found in a 1980s documentation. The IC is the 7400 and should be powered with 5...
This practical idea from a 1992 documentation shows how to count the turns of a winder using a...