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A long time ago I built an electronic train steam whistle.
It was brilliant and have used several parts of the circuit in other jobs. The main oscillators were particularly versatile and have been used in many a project since. But over the years I seem to have lost the original drawing, so have recently dismantled the only complete working model and made a drawing of the circuit.
The drawing only shows the steam generator and mixer, the oscillators will follow....
With a bit of tidying it looks like my polyphonic synthesizer might be a goer!....
Haha yes sorry Spitty, it was taken off veroboard and I've yet to add the values of the components....Green are resistors and orange are capacitors....