[sdiy] Opamp ICs (slightly OT)

[Ray Wilson]

Hi all

I added some fundamental op-amp info to my site. If you are a synth-diy
newbie you might find it informative.
You need to scroll down to it.

http://atlas.csd.net/~rjwsoft/oddsandends.html

Ray

  -----Original Message-----
  From: owner-synth-diy at dropmix.xs4all.nl
[mailto:owner-synth-diy at dropmix.xs4all.nl]On Behalf Of Robotboy8 at aol.com
  Sent: Thursday, September 25, 2003 8:51 PM
  To: synth-diy at dropmix.xs4all.nl
  Subject: Re: [sdiy] Opamp ICs (slightly OT)


  >> Okay, so what about using two photoresistors and a phototransistor?
  >> (thinking each component can be switched on and off to affect the
  .> tone: the transistor would provide square wave output, the resistors.
  >> more 'natural' output).  Is that a logical arrangement?
  >
  >   Had to think about that...hum, pretty cool arrangement actually,
  >but that's going to be heavy on the mechanical setup.
  >
  >> And schematic-wise, I guess it'd be a battery going into the resistor
  >> array, into an opamp (i have a LM386N on hand, will that work?) into
  >> the output jack?
  >Search Google for the opamp sheet.
  >
  >> Sorry for having so many dumb questions, but I'm anxious to get
  >> started and yet want to draw out a parts-list first (and yes, I know
  >> I'll need an LED as well).
  >Then get some schematics.

  Get some schematics, you say?  Done, thanks to RJWSoft's schematic
publisher!
  How does this look, in all?  I get the feeling it can't possibly be this
simple... though I haven't yet added the opamp, as I can't figure out how to
get the blasted thing hooked up in the schematic; it does need a separate
battery for itself, doesn't it?
  Picture's at www.freewebs.com/autophage/optschem.jpg or
www.freewebs.com/optschem.gif (same thing, different format).
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