This circuit that mimics the sound of the famous Scottish instrument was found in a Popular Electronics from the 90s. The components are still quite common today.
Found in a 1966’s General Electric documentation, this circuit uses a triple diode from the time....
Found in documentation from the 1990s, this circuit converts 12 V to 9 V from a car's power...
This ohmmeter can be made with a scrap milliammeter used for continuity tests or even resistance...