[sdiy] LM3900, was 566 , was Re: Midwest Analog Product Books

[harrybissell]

I did not understand the LM3900 when it was introduced... now I see what a cool
idea
it is to have a Current Controlled Voltage Source (which in spice terms is
effectively what
it is).

Bob Pease (if you respect his opinion, I do :^) considers the LM3900 a "piece
of crap"
(had we not been in public I assume it might have been more colorful).  There
was little
in the way of quality control or repeatability in the manufacture.  Specs are
nothing to
brag about in any way.

I think the LM359 (iirc) is a dual Norton Amp which appears to be better... Bob
had no
comment

H^) harry


Metrophage wrote:

> Oh yeah! It has been a long time since I've gone over the Gnome
> schematic, I'd forgotten that it used LM3900s!
>
> AN-72 is great. These amps can be applied in so many applications,
> though I can understand if some might note that they are not the best
> possible chip for each of these. I was trying to find my few LM3900s
> this month, missing, booty I am definately going to get some more of
> them.
>
> CJ
>
> --- Tim Parkhurst <tparkhurst at siliconbandwidth.com> wrote:
> > Actually, the Gnome makes rather clever use of the also oft-maligned
> > LM3900 (along with a few discrete transistors). Check the 3900 data
> sheet
> > and the Gnome schematics for some interesting lo-fi ideas.
> >
> > For the data sheet and app notes (check out AN-72)
> > http://www.national.com/pf/LM/LM3900.html
> >
> > Gnome schematics
> > http://www.paia.com/fotoalbm.htm
> >
> >
> >
> > Tim (still listening to The Aquabats) Servo
> >
> >
> > ---
> > Outgoing mail is certified Virus Free.
> > Checked by AVG anti-virus system (http://www.grisoft.com).
> > Version: 6.0.767 / Virus Database: 514 - Release Date: 9/21/2004
> >
> >
> >
> >
> >
> ***************************************************************************
> > This message is confidential.  The information contained in
> > this e-mail message is intended only for confidential use of the
> > recipient(s) named above. If the reader of this message is not the
> > intended
> > recipient or an agent responsible for delivering it to the intended
> > recipient, you are hereby notified that you have received this
> > document in
> > error and that any review, dissemination, distribution, or copying of
> > this
> > message is strictly prohibited.  If you have received this
> > communication in
> > error, please notify us immediately by e-mail, and delete the
> > original
> > message.
> >
> ***************************************************************************
> >
> >
> >
>
> __________________________________________________
> Do You Yahoo!?
> Tired of spam?  Yahoo! Mail has the best spam protection around
> http://mail.yahoo.com