Hi!
I built for the second time a Zombie Chorus (sweet, btw... :): this time, the LFO seems to have a triangular shape instead of sinusoidal; I didn't have the tools to measure this, but I can clearly hear the difference between the two choruses; the first one is really pleasant and smooth in its oscillations, while the last one I built rises, reaches a peak and suddenly lowers again. I'm not @ home right now, so I cannot take measures on the ICs pins, but I'm hoping someone could however give me some hint on where to search for some mistakes.
Thanks
P.S.: if this could help, I remember I had the same (I think) issue when I wired wrong one of the two pots, but I can't remember which one... anyway, this time they seem to be wired correctly.
The Zombie HAS a triangular LFO output. I don't know where you got sinusoidal from.
Quote from: Mark Hammer on October 02, 2012, 08:44:10 AM
The Zombie HAS a triangular LFO output. I don't know where you got sinusoidal from.
+1
>
... I'm hoping someone could however give me some hint on where to search for some mistakes.<
Look at the LFO section. First check that all the components/values are the same as the first build.
Then compare the V's of the 2 units for differences. Is the LFO high and low V the same?
If you have or have access to an o'scope you could see the differences.
Mark, Dave, thanks: you were right, I rememer wrong about the lfo... I don't know why, but I convinced myself the two choruses sounded different... the I recorded myself playing the same riff through the first and the second chorus, and I couldn't notice any difference... auditory hallucination? :)