Dual PSU:

I reckon that every electronics hobbyist should build at least one general-purpose bench PSU. Apart from being an invaluable piece of kit, the project will cover a reasonably wide range of topics, making it a very worthwhile exercise.

This unit is slightly unusual. When originally conceiving the project back in 1992, I was studying op-amps and small-signal analogue electronics. So I decided that I needed a precision, low noise, low drift dual power-supply with accurate supply tracking modes. Looking around, I noted that most dual units offering a tracking function were somewhat imprecise, and I felt I could improve on them by choosing a different configuration...

Recently, I got the chance to turn the prototypes into a working unit.

• Introduction/Pictures: More on the initial specification, and pictures of the unit.
• Circuit details: Well, simplified block diagrams, at least...
• Testing: There's a surprising amount of parameters to test...
• To-do: There's still plenty to do...