New layout: Control panel - inside a Duette

I was always intrigued as to what was inside the A3 and the H&M Duette controllers. At least one of these mysteries is now solved.

After drilling out the rivets, the lid lifts off. I've already removed the left hand controller by this stage.

The rivets holding the rectifier and cut-out for the left hand controller have also been drilled out ready for removal.

A 16V AC twin coil transformer sits in the middle, supplying independant power to each controller.

The 16V AC auxillary output is simply connected straight to the standard output of the transformer coil, after the cut-out device, with the other 12V DC supply tapped from the rectifier.

The auxillary outputs are not required so wiring is slightly simpler. 

The components are stripped, the potentiometers are mounted to the new panel and new, colour coded wiring used to make it easier for me to identify which wires go where. New toggle switches replace the old H&M ones for resistance and half wave.

All that's left is a shell, two outputs and a bank of switches.

After stripping the second Duette, all four controllers are mounted to the new panel.

And the cut-outs & rectifiers mounted to a spare piece of aluminium left over from the control panel.

This is now ready to drop into the new control panel, I'll use pluggable terminal blocks here so that if a fault occurs, I can remove either the control panel or the transformer and rectifier assembly easily without the need to de-solder anything first.