[sdiy] Adding signal LED's to an LFO module

[patchell]

    Here is a "keen" idea.  Use one of the bi-color LEDs (the one that has two
legs, not the three leg job).  Connect it through an apropriate sized resistor
to one of the outputs.  I am not familiar with TomG's SBM board, but I am
willing to bet one of the waveforms is a triangle.  I would connect it to that
output.  You probably only want about 5 mA flowing through the led.  Anyway, at
low frequencies, you will see it alternate between red and green.  At high
frequencies, it will be yellow (or something like that).  Anyway, just a
thought.

vitreousflux wrote:

> I have an EFM SBM board that has 2 LFO's - I would like to add two LED's to
> each LFO, that will fade in and out of brightness, in sync with the LFO
> phase. (one LED for positive phase, one for negative phase)
>
> I'm thinking that adding a simple opamp or two to do this would do the
> trick, but I'm a bit of a newby when it comes to original circuit design.
>
> Can anyone assist?
>
> Rob

--
 -Jim
------------------------------------------------
* Visit:http://www.silcom.com/~patchell/
*-----------------------------------------------
*I'm sure glad Merry Christmas comes just once a year
* -Yogi Yorgensen
------------------------------------------------