This circuit with RIAA equalization is from 1985 US documentation. The circuit has a flat response of 150 Hz to 40 kHz. The power supply must be symmetrical.
This simple circuit is powered by the logic circuit itself. Components are still common, although...
Here we show an oscillator that uses an LC network. The upper limit depends on the power-supply...
With this circuit, from a 1991 publication, it is possible to regulate the output of a symmetric source...