John, others here have answered your questions but as far as the Wein Bridge
oscillator, they are fine for fixed-frequency sine waves with low distortion.
You adjust the frequency via capacitors.

   If you want something more versatile, consider the MAX038. Some of it's
features include:

      0.1Hz to 20Mhz.
      Sine, Square, Triangle outputs selectable via 2 TTL inputs.
      Sine wave distortion is 0.75%.
      2Vp-p output drives +/- 20ma.
      Frequency modulation and frequency sweeping. 350 to 1 range.
      Independent frequency and duty-cycle (15-85%) adjustment.
      Internal oscillator can sync to external TTL clock.
      TTL Sync output with 50% duty cycle.

   They cost around $20 though...

   - Tom

At 01:47 PM 3/16/98 +0000, you wrote:
>Fellow Piclisters
>
>How do I go about connecting a *two* pin resonator to an '84? The schematics
>I've seen so far show a *three* pin device, with a pin to ground. And are
> external
>caps required?
>
>And while you're here, everyone who's an electronics bod will know
instinctively
>how to make a Wein Bridge oscillator, but I'm a computer bod, so I don't. If
>anyone could oblige with a schematic (ascii or otherwise) with values on
>components, I'd be very grateful. Horowitz and Hill have an example, but with
>a miniature incandescent lamp that I can't identify. Adjustable frequency would
>be a special bonus.
>
>Regards
>
>John Midgley
>
>