Audio 6 Input Mixer Amplifier Circuit Diagrams
The mixer circuit above has 3 line inputs and 3 mic inputs. The mic inputs are suitable for low impedance 200-1000R dynamic microphones. An ECM or condenser mic can also be used, but must have bias applied via a series resistor. As with any mixer circuit, a slight loss [...]

Producing low-distortion sine waves, this oscillator operates over the range 16 to 22000 Hz.
The circuit is based on two articles that have appeared earlier in Wireless World – Roger Rosens’ “Phase -Shifting Oscillator”, February 1982 pp. 38-41, and J. L. Linsley Hood’s “Wien-Bridge Oscillator with low harmonic distortion” from May 1981 pp. 51-53.
This design features [...]