With variable frequency and voltage using the two potentiometer (500k in middle does frequency, 1k at bottom right does output voltage).
The switch at bottom right switches between triangle and square waves.
Important: Measure the waveform output at at the "watched" green waveform, above the 10k resistor at the top right of the circuit. This is where the triangle and square waveforms are supposed to appear. Update: I’ve put a voltmeter component there and it is visualised on the graph.
Based on https://www.jaycar.com.au/medias/sys_master/hff/h39/8884453310494/BJ8505-ShortCircuits-3-310316.pdf Short Circuits Volume 3, Project 30.
