Tim Es Wobbletron

[lightningfingers]

Has anyone built this?

I want a vibrato circuit, but without the LFO...Could the FET be replaced with a pot perhaps?

//www.geocities.com/tpe123/folkurban/fuzz/snippets

[gez]

Has anyone built this?

I want a vibrato circuit, but without the LFO...Could the FET be replaced with a pot perhaps?

Er, do you have a fast ankle action of something?!  

[ExpAnonColin]

If I'm not mistaken, removing the LFO will remove the change in phase, basically either making the effect either nonexistant or very hard to hear.  I'm thinking in terms of BBDs...  but if you were to remove the LFO in a BBD based one, you'd just be mixing your guitar signal with a slightly echoed one, which wouldn't create much of an effect at all, the thing has to be moving.

-Colin

[chumpito]

So would that make it a sort of temporary whammy pedal?  As soon as the movement stops it goes back into tune.

[ExpAnonColin]

So would that make it a sort of temporary whammy pedal?  As soon as the movement stops it goes back into tune.

The danelectro pitch daddy works like this...

-Colin

[Tim Escobedo]

Removing the LFO, leaves a single phase shift stage. If the FET is replaced by a pot, any one setting would be less than dramatic. In order to really hear the effect, you'd have to twist the pot back and forth more than about once per second, generally more dramatic results the faster you twist back and forth. Obviously, this isn't a viable idea. In a phase shift type vibrato, it's the modulation that really makes the effect work. The "time delay" is probably better described as a "phase delay". The amount of this delay is not constant throughout the spectrum, but is most dramatic at the RC frequency.

It would NOT make a pitch daddy or whammy type effect. This pitch vibrato is the result of switching between inverted and non-inverted versions of the guitar waveform. Inherent in this action is a tonal change, so the result sounds like a subtle pitch vibrato, along with almost tremolo/Phozer-like swirl.