I'm using an external power supply to provide 24vdc to a GPS circuit. I am also supplying the same 24vdc to an LM317 being used to reduce the voltage to 15vdc to drive a small fan and a LED(with limiting resistor). The GPS circuit is disconnected and the fan disconnected. During checkout the circuit appears to saturate the LM317 when the micro switch applying power to the LM317 is turned on. If the micro switch is left on or the LM317 is hardwired and the external power supply is turned on everything is fine. I have tried caps, snubber circuits and different switches but no luck. This circuit is setup exactly as the application notes show it.
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