A couple LFO's

[petemoore]

  I was looking for reads...
  Then figured two stages of one phaser on an LFO and another LFO for the other two stages...
  Or, use an LFO to drive and LED/ use an LDR where [or around where] the speed control of the first LFO would be.

[R.G.]

Yep. good idea. Multiple almost-synchronized LFOs is really interesting.

On the LFO driving LED/LDR with the LDR running a speed control, that works too. In LERA I used a person's foot for the LFO.

[Dave_B]

Yep. good idea. Multiple almost-synchronized LFOs is really interesting.

Are there any digital LFO circuits in common usage?  Multi-sync'd LFO's would seem to be a good application of a PIC chip.  I've been kicking around the idea of a wavetable LFO for a few months now.  Has it been done in the DIY stompbox world already? 

[petemoore]

Yep. good idea. Multiple almost-synchronized LFOs is really interesting.
  One very easy way to get 'stagger' might be simply blocking some of the light to two of the LDR's, say a sheet of sorta thin paper, the two LDR's seeing direct light would surely see more change faster on their resistances than the two with less direct lumens hitting them...wortha try...since I've been 'phasing in the dark' I can easily mess with the LED/LDR sections light shield[s.

[gez]

   Then figured two stages of one phaser on an LFO and another LFO for the other two stages...
 

If both LFOs are 'freewheeling' then should be fine, but if synched you have to bear in mind the phase relationships between the LFOs. 

If you run stages in series and control x stages from one LFO and y from another synched LFO it's advisable to add a mixing stage in between the two, otherwise the second LFO can work against the first - shifting phase in the opposite direction - for much or all of its sweep (depends on the phase angle between the LFOs) so the end result is a very weak phase. 

More interesting and musical to use different sweep ranges.  I've messed about a lot with quad LFOs and phase, but once you start getting past three synched LFO's the patterns of cancellation and reinforcement can be a little unpredictable and the effect can sound a mess.  Bit of a headache to tell you the truth...