Jump to content
Electronics-Lab.com Community

LED turn

Recommended Posts

Hi Eplanet,
You don't say the supply voltage and you don't say the max current for your LED. Most LEDs have a max current of 30mA but usually operate at 20mA to be bright. Some LEDs have a max current of 700mA.

I made a circuit with a capacitor that charges slowly from a resistor when power is applied. An opamp and transistor boost the current to drive the LED.

Link to comment
Share on other sites

  • 1 month later...

If all you want is to slowly turn the LED on, a simple RC is all that you need. The extra parts are NOT needed. Assuming your circuit can supply at least 20mA. Are you talking about an indicator for something in your car? Plenty of current capacity already..

I see a lot of replies on this forum forgetting the basic rules of design; KISS.

Link to comment
Share on other sites

I could be wrong, but I think he is talking about the power LED on a device. Not power LED's as in high power. I also believe that the LED is being turned on now. He just wants to make this happen slowly rather than all at once.

Could be wrong and it wouldn't be the first time.

Hey eplanet, can you supply the missing details?

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...