The original prototype was built up using components and fairly “raw” connections to create a sample circuit based on the original simple logic circuit design to achieve basic control for commonly available capacitor start capacitor run electric motors.

The subsequent commercial design, “VERSION 1”, was a refined printed circuit of the same design housed in a smaller case with modifications to the power supply to match the requirements of the final circuit design.

Unfortunately this design had inherrent flaws which caused instability of the low voltage logic circuit and the design was “back to the drawing board”.

During further development the original prototype continued to be used and worked flawlessly – the concept was clearly working, it was just a matter of refining this into a production quality product.

At one point the prototype was temporarily loaned to a field job where it worked for a period and then part of the circuit that controls motor direction failed. I suspect vibration and stress on components was the cause, after all it really was just a prototype and only ever meant to test out the design – despite that it had already had years of work for my own family.

After some time was spent trying to find the fault in the prototype I decided it was not worth the time to fully diagnose and fix – it had served it’s purpose and proved this design would work!

And so, It was time! to revise the design and work towards what I had originally thought the control unit could be..