Help with out of phase LED LFO

[RLawlor]

I'm messing about with lowpass and high pass filters and I remembered that a harmonic tremolo is essentially modulating the volume of the high and low frequencies out of phase. I've been trying to find / design an LFO that will drive two LEDs but with one being 180 out of phase with the other with no luck  . Does anyone have any schematics or tips on what to do such as how to invert the phase of a signal (I tried an inverting opamp but it seemed to lock up both) or a suitable way to drive an LED so it goes from completely off to full brightness.

Many thanks,
Ronan.

[11-90-an]

Try checking looking at the LFO of the Dimension P:

https://www.diystompboxes.com/smfforum/index.php?topic=94435.0

Good luck!

[RLawlor]

Try checking looking at the LFO of the Dimension P

That looks perfect, thanks  . Time to start up LTSpice...