Sine Wave Generator For Driving LED

[Agung Kurniawan]

hi everyone..
im looking for wave generator to driving some LED. once i have seen in phasor effect but i forgot the name was.
can you please recomend me some sine wave generator?
did LFO on some chorus pedal can be used to drive LED?

[Rob Strand]

Checkout the Boss VB-2 and the Black Ross Phase (the 3rd version, it uses a LM13600N).
As I recall the Ross phaser is quadratic not sine but it sounds smooth.

[GibsonGM]

The LFO section of the Easy Vibe is good, too. Easy, and uses any (singles or) dual opamp.  Triangle, but that is appropriate for driving LEDs (which is what it was designed to do).

[amptramp]

The LED output is directly proportional to current, so drive from a current source makes more sense than trying to drive from a voltage source.  The Howland Current Source is my favourite:



and the mathematics is here:



and the final answer is here:



I ran into this one in an avionics application where there was a linearized temperature sensor driven by the constant current and the output of the op amp was a voltage proportional to the resistance.  Drive the Vref input with a sine wave and you get sine wave light output.

[Kipper4]

Phase shift oscillator will also work.
Google Magnavibe or use the forum search facility and look at the lfo.

[Agung Kurniawan]

ok thanks! that was really helping...
you guys rock

[Kevin Mitchell]

I'll just leave this here;




The LFO used in the tremshifter is great. I use it all of the time - mostly for an on-the-fly LFO. You can find similar versions used in something like the Causality that has much more controls to mess with. I'll be tinkering with this stuff again tonight.

[Kipper4]

Tremelus lune lfo.

[rutabaga bob]

Are you looking to drive an led in sync with the lfo, or to light up as you play?  If the latter, refer to Deadastronaut's 'Sound-to-Light'.