We found this circuit in Ferranti's 1974 transistor manual. The components are from the period. The table gives the value of C1 for different frequency ranges.
This circuit was obtained from a Philips documentation from 1968. The transistors can be replaced...
The figure shows how to use the XR2206 to generate sinusoidal signals in a different way. The...
This headphone amplifier has good gain and high input impedance. The circuit is from Electronics Now and...