David,
Is that a Generator you describe or the O'scope? either way I would be
interested in buying one if they are still available. Could you pick on up
for me and I'll Pay for the unit and shipping.
Thanks,
Jim
>From: "David Bivins" <david@...>
>Reply-To: motm@onelist.com
>To: <motm@onelist.com>
>Subject: RE: [motm] Function generator as oscillator?
>Date: Wed, 11 Aug 1999 18:08:48 -0400
>
>From: "David Bivins" <david@...>
>
>Thanks so much for the explanation. I will certainly play with it further,
>and if I can get out of here before 7, I'll stop by the Shack on the way
>home and get some BNC connectors.
>
>The face profile of this isn't all that much bigger than a MOTM 3U module,
>btw. Also, it's what I used to do that little audio sample at
>http://www.totaltrash.com/audio/Sound2.mp3, manually switching between the
>sine and square waves (and MOTMing it up of course!).
>
>I should go get some more--I got it and an old oscilloscope (works, clean
>display, bakelite bird-beak knobs, wonderful to look at, black like the
>MOTM, no marks on the display so not so useful for anything but "Cool!"
>value) for $40 in the Coney Island area from a backyard surplus dealer.
>Don't worry Paul, I'll still be ordering oscillators from you!
>
>Take care and thanks again!
>
>David.
>
> > -----Original Message-----
> > From: Dave Bradley [mailto:daveb@...]
> > Sent: Wednesday, August 11, 1999 11:44 AM
> > To: motm@onelist.com
> > Subject: RE: [motm] Function generator as oscillator?
> >
> >
> > From: "Dave Bradley" <daveb@...>
> >
> > > Anyway, I keep the signal waaay down (all the way actually),
> > and I've not
> > > blown up any of my equipment (I actually did test it first--I don't
>have
> > > documentation for it as it was a surplus buy). Is there any forseeable
> > > problem using it with my MOTM? And forgive my ignorance, but
> > what are the
> > > basic differences between function generators and oscillators?
> >
> > A function generator IS an oscillator. It's optimized to be a
> > high precision
> > test signal source. It will typically be very stable, and will have
> > extremely pure waveforms. Most do not have CV inputs. Yours does, but
> > probably it is not calibrated for exponential 1V/Oct response. By
> > all means,
> > make up a patch cord and stick some control voltages in and see what
> > happens.
> >
> > A VCO in a synth is also an oscillator, but typically has less pure
> > waveforms, is optimized to provide an array of control voltage and sync
> > inputs, etc. The MOTM-300 is a LOT closer to a function generator in
>terms
> > of stability than most. Its saw and pulse waveforms are good and
> > sharp also.
> > The function generator will probably have a purer sine and triangle
> > waveform, but it cost many times as much when new, and probably is very
> > large.
> >
> > The MOTM-300 signal levels are around 10 volts peak to peak. If you
>match
> > that, it will work fine. If the function generator does not have
> > calibrated
> > output levels, stick a volt meter on it, set the volt meter to read AC
> > volts, and adjust the output level until it reads about 7 Volts AC. (The
> > meter is reading volts RMS instead of peak to peak, and 7V RMS is
>approx.
> > equal to 10V pp).
> >
> > Dave Bradley
> > Principal Software Engineer
> > Engineering Animation, Inc.
> > daveb@...
> >
> >
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