This circuit was found in a Popular Electronics from the 90s. The circuit uses common components today. The waveform of the generated signal is shown next to the diagram.
Using an operational amplifier, the figure shows how to convert the waveform to low frequency...
This is the power step of the previous circuit. Output transistors must be mounted on good heat...
The UM3562 integrated circuit (not very easy to find) synthesizes three types of sound that...