LFOs

[Harry Bissell]

Is there a (father forgive me) micro in the design.... then drive the LFO from a

PWM signal out common to all channels.  Integrate with one opamp, and use the
other  to
reverse the polarity. If you use sync on gate, they could all run together, or
separatly.  Should not be too hard.

A company took a clever 4-20mA output I designed and replaced my DAC with a
PWM... much cheaper than my solution and it worked much better than I'd have
expected. At the major carry (7 to 8 bits) is worked BETTER...

H^)  harry

I'd like to see "MIDI CLOCK SYNC" mean that the LFO runs at an intergal multiple

of the clock, like soft sync.  But what does it REALLY mean ????



Paul Maddox wrote:

> Dear All,
>
>  Ok couple of questions regarding LFOs..
>
>   Im developing a polysynth (with the interest of a certain synth
> manufacturer) and I intend to make it
> 8 voice poly. Now couple of questions about LFOs,
>
>   1) Should I have 8 seperate LFOs or one global? I dont want both.
>   2) Midi Syncable LFO, Ive been advised that this is something they would
> like to see,
>         someone explain to me what it is, Im guessing that with each
> successive midi clock received the LFO is
>         stepped through its waveform. am I right? and if so how do you tell
> it how many steps it takes to do a full
>         cycle, ie 1 beat, one bar, 8bars??
>    3) I would like the LFO to be voltage controlled (its going to be
> programmable) and have a sine wave (if the
>         above point is true then it doesnt matter as its going to have to be
> a lookuptable anyway).
>
>   oh, I also want it done with just 2 opamps (ie ONE TL072), I need this
> thing to be compact if Ive got to build
> 8 voice cards. Trying to find an easy way to do 3 EGs under CV/DIGITAL
> control. All with as few chips as
> possible..
>
>    Thanks for any help,
>
>   Paul Maddox
> ________________________________________
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