As a special bonus, [lonesoulsurfer] made a little square wave-squirting synth based on the 4046 hex inverter and included the schematic for it.

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This Design Idea provides a simple, inexpensive, portable circuit as an alternative to a microcontroller to provide a wide-range source of low-distortion ...

As a special bonus, [lonesoulsurfer] made a little square wave-squirting synth based on the 4046 hex inverter and included the schematic for it.

This circuit uses a standard hex inverter to create an oscillator and Class-D amplifier, which in turn drives MOSFETs that can efficiently supply the bipolar rails and sink the ground current.

A simple low-pass filter (120kΩ 470nF) converted the pwm waveform to dc in each case – with the capacitor returned close to the hex inverter in the buffered case, and (to my shame*) almost randomly ...