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.
Red Flag Submitted
Thank you for helping keep Eng-Tips Forums free from inappropriate posts. The Eng-Tips staff will check this out and take appropriate action.
Reply To This Thread
Posting in the Eng-Tips forums is a member-only feature.
Simulation is an increasingly valuable tool across the product design workflow, but not all simulations are equal. We set out to determine how engineers and product designers make use of specialized analyses, how they incorporate nonlinear simulation into their work and how they rate the available software. Download Now
Our data is constantly exposed to the danger of being intercepted or stolen as it wends its way over global data networks. Data security measures and measures for protecting intellectual property should not, however, first be implemented when data is exchanged – companies must lay the foundation for these measures within their own organization. Download Now