This circuit is from an ancient American documentation. The integrated circuit is 741 and the power supply must be symmetrical. The passing band is centered at 1 kHz.
This simple timer can be used in many applications such as egg timer. The LED glows up when S1 is...
This filter was obtained from a Linear Technology manual from the 1990s. The power supply must be...
Found in 1965 General Electric technical documentation, this half-wave circuit controls shunt type...