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more simple. one transistor and a theoristor on the base to vary the voltage?
hello, thats might have been an idea buti have a 20-30v output or a 8-6v input boost conv i can tap the power fromusing a thermister and a LM317 would give me a voltage drop overhead and a output that will vary on the input.if my boost conv. is variable then it will effect the lm317i want to drive a 12v fan 5-12v in speed. so it wouldnt work well i dont think?