I am installing a fan in the dash of the 10. It is a 120mm fan and want it to run slowly most times and full blast when needed via switch. Plan to run the full 12v through one side of the DT switch and 4.5v through the other side. I have tested this on the bench and like the flow at 4.5 volts drawing 100 mA. This was tested using an LM317 in constant voltage mode.
My question is what size resistor do I need to get my 14 volt buss voltage down to 4.5 volts? Also, for computing the power for sizing, can I use the current observed at 4.5v on the LM317 based power supply?
I could use an LM317 for this, but would like to avoid throwing a little board in the harness if I can.
Larry
My question is what size resistor do I need to get my 14 volt buss voltage down to 4.5 volts? Also, for computing the power for sizing, can I use the current observed at 4.5v on the LM317 based power supply?
I could use an LM317 for this, but would like to avoid throwing a little board in the harness if I can.
Larry