I am trying to build a black box to induce a constant adjustable positive voltage on my downrigger between 0 and aprox 1.5 volts DC. The cathode being a sacrificial zinc trim tab on my outboard and the Anode being my stainless steel Downrigger. I am going to utilize my boat battery 12 VDC for source power. Question; Can I use a simple voltage divider IE: a 100K resistor and a 10K Pot or do I need to use an OpAmp or other regulator circuit :?: The current natural voltage is +.430 in fresh water. Advantages and Disadvantages, Any replys appreciated.
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Reference: **broken link removed**