> How do I go about connecting a *two* pin resonator to an '84?
Already answered.

> 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.

The lamp is used to provide automatic gain because it has a positive
temperature coefficient. ie. As it heats up, the resistance goes up.
In the H&H example, the gain is set by the 750 ohm resistor and the lamp
which needs to have a resistance of exactly half the value of 750 at
oscillation. The lamp is chosen to have less than this when cold and more
than that when hot. Hot in this instance, is when the current through the
lamp is set by the oscillator amplitude and the 750 ohm resistor. Because
the hot resistance is about ten times the cold resistance, the lamp type is
not very critical. It sorts itself out.
You can set the amplitude by varying the 750 ohm resistor and vary the
frequency by changing the value of both C's (usually by a ganged variable
capacitor).

The best idea is to build one and have a play with it.

Steve.

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  Very funny Scotty.  Now beam down my clothes.
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Steve Baldwin                Electronic Product Design
TLA Microsystems Ltd         Microcontroller Specialists
PO Box 15-680                email: steveb@kcbbs.gen.nz
New Lynn, Auckland           ph  +64 9 820-2221
New Zealand                  fax +64 9 820-1929
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