Actions
Forum Thread Details
  • Replies 8 replies
  • Subscribers 474 subscribers
  • Views 801 views
  • Users 0 members are here
Related

Overcurrent protection, what is a cheap and simple way

Catwell

I hope this message gets read....

 

 

 

In a circuit I am working on, I am powering two pins at the same time. These pins are powering a single LED.

When I power both pins I am doubling the current powering an LED.

 

What I need to do is protect the LED from excess amperage. What suggestions do you have? I know there are many ways of doing the same thing, I just want to collect them all.

 

Any help would be appreciated.

 

Cabe

Parents Reply Children
  • in reply to Catwell

    Hi Cabe,

     

    I don't have enough information about the circuit you have.  You have 2 pins powering a single LED.  But I don't know what type of signals these pins have. It's better if you can define what you need to acheive, along with the systems contraints.  What's the power supply, is it regulated, what current are you targeting, what are the two controlling signals... 5V, 3V, a push button or switch etc...

  • in reply to Former Member

    Eclipze,

     

    Input voltages on both pins from an unregulated supply (no clue what it is, to be honest):

    Pin 1 :14.5V

    Pin 2 :14.5V

     

    Current on the LED should be 20mA.

     

    Normally, one one of the pins will be on, and the system will be fine. But my customers are not quite sure what they are doing, and might power both pins at the same time.

     

    I have limited space on my circuit board, and need a small, simple solution. Possibly close to the LED itself after the point where both inputs combine.

     

    Thoughts?

     

    Cabe