Hi folks so I would like to produce a variable output from the following CCT. I wonder if putting a FET in to the feedback circuit and using a PIC, maybe either the simple d/a convertor or some resistors on output pins would do it. However, I don't really work with FETS so could do with advice...

The module is one I have purchased from Ebay and uses a pot instead of R1&2. I would exchange R2 for a FET.

The module is one I have purchased from Ebay and uses a pot instead of R1&2. I would exchange R2 for a FET.
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