How to have a precise control on a op-amp based LFO?

[nguitar12]

Recently I am playing with tremulus lune LFO (schematic below)

http://fuzzcentral.ssguitar.com/tremulus/tremulusschematic.gif

By experimental with different component value I got a pretty good result with the voltage swing and speed range. Just wonder how to have a precise control on the LFO like the amplitude/offset. Is there any good article good for beginner?

[duck_arse]

I think R.G. did a dissection of the schmitt/integrator osc in the last 18 months, but don't ask me what the thread was. I found this via a popular search engine (there are others):

http://www.diystompboxes.com/smfforum/index.php?topic=113502.0

[blackieNYC]

I really liked the oscillator in the cardinal tremolo.  A couple more parts, but it might be exactly what you're looking for. Search this forum.

Edit - looks like he's pulled the drawing.  He sells. He's a very good musician and as such has a hard time holding down a real job. So no schematic.  Maybe I drew out my LFO somewhere.


EDIT:  SEE BELOW

[Kipper4]

http://www.diystompboxes.com/smfforum/index.php?topic=104958.0

[blackieNYC]

Check this
http://www.diystompboxes.com/smfforum/index.php?topic=111261.msg1029293#msg1029293
I built a lune and had a similar problem - I wanted to get the full range out of the LDR. The cardinal v2 LFO was perfect.
this is the LFO output arrangement I copied from the Cv2.  This seems to cycle around the 4.5v reference.  Can't exactly remember why, but I was told it would fix the problem and it did.

[blackieNYC]

It's Midway Fair's LFO output.  Hope you don't mind Jon.  Works really well.

[reddesert]

I really liked the oscillator in the cardinal tremolo.  A couple more parts, but it might be exactly what you're looking for. Search this forum.

Edit - looks like he's pulled the drawing.  He sells. He's a very good musician and as such has a hard time holding down a real job. So no schematic.  Maybe I drew out my LFO somewhere.


EDIT:  SEE BELOW

Huh?  Read the Cardinal Tremolo build doc, the schematic is in it: http://1776effects.com/product/cardinal-tremolo-v2/

The link in his original thread is probably just broken because Dropbox changed their rules about public folders so as to break years' worth of forum links.

[blackieNYC]

Thanks
Seemed like only yesterday.