Proportional Heating Valve

My prototype control circuitry for a cheap proportional hydronic central heating diverter/blender valve is progressing well.

The MkI version worked well with just mechanical switches.  Producing a valve which can be set and held in any position of its normal rotational path.  This now allows me to produce a CT (Constant Temperature) valve and control unit for well under £100.  A significant saving on current units,which sell for several hundred pounds.

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