MOTM

David,
I don't need any precision stuff. but I'd be really happy to have one of 
each if you can get them. Let me know.
Thanks,
Jim


>From: "David Bivins" <david@...>
>Reply-To: motm@onelist.com
>To: <motm@onelist.com>
>Subject: RE: [motm] Function generator as oscillator?
>Date: Thu, 12 Aug 1999 10:40:08 -0400
>
>From: "David Bivins" <david@...>
>
>Here's a pic of a similar function generator that has an almost identical
>front panel layout (in addition, mine has a manual trigger on the front
>panel--don't know what else is different).
>http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=136709517
>(eBay's good for something, eh?)
>
>The scope is black with silver legends. It's (damn, what is it)... Dumont?
>Can't remember. Regardless, it's called an "oscillograph" and it's the one
>with the bakelite knobs, etc. It's definitely over-the-hill for precision
>lab work, but it displays waveforms just fine. It weighs a lot. Hell, let's
>try eBay again... eh, nope.
>
>How about I head out there this weekend and see what I find? At those
>prices, I can afford to pick up a few pieces and then post them to the list
>and see if anyone's interested. A lot of these HP function generators are
>really light as well, so shipping wouldn't be much at all.
>
>I'll also take this offlist from now on. I do think this old lab equipment
>looks divine next to the classic look of the MOTM. (That's my attempt to be
>on topic.)
>
> > -----Original Message-----
> > From: james holloway [mailto:jimh54@...]
> > Sent: Wednesday, August 11, 1999 8:12 PM
> > To: motm@onelist.com
> > Subject: RE: [motm] Function generator as oscillator?
> >
> >
> > From: "james holloway" <jimh54@...>
> >
> > 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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