I have a simple circuit involving an LM7805 to get the a 12v feed down to 5v to drive a pic. I've had a couple of people blow the regulator up by connecting it up backward. Is there a simple circuit I could use that would protect the regulator burning out if it was accidently wired up backwards?
I have a simple circuit involving an LM7805 to get the a 12v feed down to 5v to drive a pic. I've had a couple of people blow the regulator up by connecting it up backward. Is there a simple circuit I could use that would protect the regulator burning out if it was accidently wired up backwards?
hi,
Are you saying the 7805 is being wired 'backwards' or that somehow you are putting a negative voltage on the 7805 or getting the 0V and +5V lines reversed to the load.
No dispite labeling the wires and giving clear instructions. People still manage to reverse the wires, I guess you can make any assumptions about people with consumer electronics.
So would just a simple diode in series on the input side of the regulator be enough to protect my circuit then?
No dispite labeling the wires and giving clear instructions. People still manage to reverse the wires, I guess you can make any assumptions about people with consumer electronics.
So would just a simple diode in series on the input side of the regulator be enough to protect my circuit then?
the magic diode is only really good for most end-user stupidity. Design/Construction stupidity needs to be plugged into an non-earth appliance and irradicate it from the gene-pool (well we all make mistakes so maybe not straight away )