Jump to content
Electronics-Lab.com Community

Simple LED strobe

Recommended Posts

I'm designing something.  Not sure what.  :o ??? Sort of.  OK nevermind that.
I'm still new to electronics and somehow have trouble with 555.  I think I need to spend a day to just figure them out.  Anyway, I need an astable circuit that wil cause LED(s) to blink that can be adjustedd by a pot.  This would be like christmas lights that have the knob on the box.  I want them to go from steady on and down through fast strobe to either a very slow blink or completely off.  I will need an output of about 3V.  I just don't know what sized resistors and pot to use.  The bigger (higher resistance) the pot the slower it will blink?  Is there an easier way than using a 555?

Link to comment
Share on other sites

Here's URL with tutorial and simple schematics. Look for picture for Astable operation (in the mddle of document).

Some simple schematics and calculator for 555 can be found here:
There's even sample for driving LED's

To prevent false triggering of 555, connect PIN4 to V+ (directly) and PIN5 to ground via 10nF ceramic capacitor.

Hope this helps

Link to comment
Share on other sites

Hi Um...Me,
Have you seen my chaser projects? They aren't simple because they sequence 10 LEDs.
They have a pot for blinking speed and another pot for brightness.
Their battery seems to last "forever":

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...