Small Stone LFO's P2P Current?

[michael_krell]

What exactly should I be looking for in the dry and wet signals? (as far as amplitude and phase and any kind of "dancing")

also. if i increased the value of that drop down resistor. will i get a higer output? these issues of the small stone seem to have a volume issue.

[puretube]

free information block:

[gez]

Too slow PT, I snagged that little gem a few days ago when it was first posted!  

I've adapted the standard OTA triangle oscillator to do the hyper-triangle thing and am trying to get some PWM happening without affecting frequency.  Stage one has gone well, fingers crossed for stage two...

[puretube]

... I used in my 13700 mod of that one...

whatcher gonna PWM?
an MXR-clone?
(nosy me...  :oops: )

[gez]

If I can get it to work, I'll rig the LFO up to an OTA filter.  If you set the mark space ratio as 2:1 or 1:2 and use the triangle output to sweep the filter, it creates a swing feel which sounds excellent with auto wahs - automatic psychedelic boogie!    One ratio provides the accent on the down beat, the other on the off-beat (ska-shuffle).  

It's really easy to do with the standard op-amp triangle circuit (without altering frequency/amplitude etc), but this one is driving me nuts.  All character building stuff I suppose!  

I'm not even supposed to be working on all this (what happened to my phaser circuit?!), but I'm easily distracted... :oops:

[puretube]

( I`m not even supposed to be spending that much time here... :oops: )

(but I can`t go into detail here, sorry  :cry: )

*my original "WORM" prototype had that feature, too... - too many knobs..

[gez]

tell you what: there`s another way to do it:
instead of the OTA-filter with its linear Gm controlled response,
it can be done with filters, that react logarithmically
to a control-voltage, instead of linearly

That's a nice idea, I have some simple schematics for circuits that convert a linear control voltage into a log output.

The thing is though, as you're aware, a lot of triangle oscillators (though fine in the audio range), have a non-linear quality to them at the frequencies used in most (effects based) LFOs and start to resemble the waveform you get if you tap the junction of the resistor & cap which set the rate in a simple relaxation oscillator.  The thing about the OTA hyper-generator thing that really impresses me is its symmetry and low distortion - up sweep same as down.  This is why I'd like to persevere with it.

I appreciate that in practice such minor distortions often aren't even audible...but sometimes they are.  I'll keep messing about with this and see if it makes a difference (I've already done this in the past using other methods so I can make an A/B comparison).  Even if it isn't worth the effort, I haven't lost anything as the LFO I have is a slight improvement on the Ross one (more linear feel to the rate pot) so I can always use it in a phaser.  

[puretube]

free information block:

[gez]

Damn, another bloody circuit to try out, I need more breadboards!!!  

[puretube]

got 6 overpopulated ones laying around in the way,
and just built a 2nd circuit on the 7th board...  :roll:

[Jason Stout]

..........on the 7th board...

I only have 2½ boards and they are occupied.