12v LM317 Fan Controller v 1.3
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Updated LM317 fan controller
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6 Months of Music – Borderline Express
I’m super stoked to announce Borderline Express coming to the New Sharon Congregational Church UCC on June 16th! Tickets are only $10 and are available in the usual locals: Douin’s Market and Everyday Music. Come cross the line with Borderline!
12v Fan Controller v1.2
12v LM317 Fan Controller v1.2
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New 12v Fan Controller
This is my latest fan controller, based off a LM317 regulator. It can be adjusted from fan turn on at 64F and max speed at 131F up to turn on at 104F and max speed at 167F.
12v LM317 Fan Controller v1.1
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Fan Controller
Fan Controller
This is a fan controller I worked on, based on the Temperature Controlled Fan I found online.
In this version, R1 is a 10K NTC thermistor (shown in schematic at 20C, which is 12.5k). Adjust R2 for the turn on temperature and R4 for the full speed temperature. Fan is a 12v PC fan that draws 0.11 amps.
Note that if you change R4 (full speed temp) you will need to re-adjust R2 (turn on temp). Due to this behavior, I suggest using trim pots for R2 (5k trim) and R4 (500R trim) and adjusting R4 (full speed temp) first and then R2 (turn on temp).
*Note: I have not actually built this circuit, only played with it in LTSpice.
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