it might also help to have a DC offset cap on the output of the LFO right before the led to "re-center" the voltage ( not sure if there is one there now ? ). also possibly toss in a 100k or larger resistor to ground around there to help bias it a little.
Nope, no DC offset cap. Built it just like the Schemo. I don't even know how to implement one of those
I'll try this stuff the next time I open it up (and when I learn how to do the Cap thing). I have it housed in an old automotive tester box with the Osc out sent to the tester's needle so it swings back and forth with the osc. I set it up to be a modular thing for my guitar pedals. It has a course (10 meg) and fine (1 meg) speed control, larger shape pot to get the interesting patterns between tri and square (5k), and a brightness knob for the LED. The osc out goes to a 1/4'' inch jack so that all I have to do to use it on a pedal is add a 1/4'' jack to it, and wire it to the effect I want to modulate.
Thus far I've tried it on an "Ugly Face", "Crash Sync", "PWM" and "Thing Modulator" all with good results. I also tried it on a inductorless wah I built, but it didn't do as well. Fab Echo that's coming in the mail will be next to try it on. I've done one of those with a squarewave before, but not triangle.
seems like everyone is building LFO vactrol shit these days. lets hear it when you are done
I've used them quite a bit on circuit bent toys, but never effects before. I wanted to do something with a triangle wave when I built my first PWM with super simple LFO (it only does sqaurewave). The way it jumped the effect back and forth I knew it would sound a lot cooler with a trianglewave. I just didn't know how easy implementing it could be. Thanks Colin!