OTAs and Harry's flame bait BDDs

[Harry Bissell]

Yo Larry (et al)

The OTA is lots of fun to play with. I'm sorry I didn't start playing with
them
years ago.  watch out for the Gm bias pin though... its a current input and
applying a voltage to it (with no current limit) will kill it.

Who has Gene Zumchak's OTA primer on their site... OK fess up... maybe
Rene?  I forget... but read that. If you don't get it, ask some questions on
or off
list....

H^)  harry

"J. Larry Hendry" wrote:

> ----- Original Message -----
> From: Harry Bissell <harrybissell at prodigy.net>
> BTW I consider the BBD a digital delay, albeit
> a Sh!tty one. The fact that it has an analog range
> of oh... a couple volts in the Y axis does not cover
> up the sampled data nature of the X axis....
> so just saying analog does not mean good !
>
> (if this don't draw some flames then the list is dead....;^)
> H^) harry
> ----
> ZZZZzzzzz.........
> You are witnessing the lingering effects of turkey induced tranquility.
> Larry H
>
> ----- Original Message -----
> From: Scott Gravenhorst <music.maker at gte.net>
> An OTA (operational transconductance amplifier) is an
> extension of an opamp in that the multiplier is controllable
> by a voltage.  Even more fun things can be done with an
> OTA,  including voltage controlled oscillators, filters and
> amplifiers (plus more).
> ----
> Forgive my ignorance as I am still a newbie to these synth circuits.  I
> am learning and am just getting a fairly decent handle on these
> op-amps.  My first real project was to use some 1013 op-amps
> to add octave and interval switches for any 1-volt-oct VCOs since
> the MOTM-300a that I use have only continuous tuning.
>
> The prototypes can be seen at:
> http://www.modglin.com/larry
>
> I found Scott's etire post to be quite interesting.  But, his description
> of OTA's is what has me most interested.  Seems like this might be a
> nice "next step" for me to build something.  I plan to do some
> reading in some of the recent texts I have acquired.  But, I consider
> this list a better resource than anything, so I will ask a basic question.
> Are OTAs really good choices for voltage controlled amplifiers for use
> in things like VC panners, VCAs amd VC mixers?  Or is purseing that
> course of action mostly an excercise in education?
>
> Is 3080 I see mentioned a lot a good choice for VCA applications?
>
> As always, thanks for the expertise, humor, and tolerance of newbies on
> this great list.
>
> Larry Hendry