Wes:

Those osc are a thing of the past...

Bring a junk am broadcast radio near your computer, you will hear literal
dozens (well, a bunch anyway!) of osc's freqs going on there, probably not one
being generated by a colpitts, hartley or pierce osc circuit...
And, with the proper processing, all those waves could be a sine...

John

"Wes Stewart" wrote in message
...
On Thu, 28 Jul 2005 08:18:49 -0700, "Caveat Lector"
wrote:

Just out of curousity -- what modern Ham gear uses a Colpitts oscillator or
a swinging choke ??

Then why ask these questions on a 2005 Ham test ??

Maybe ask about a VCO or a crowbar circuit ??

Okay, draw me a circuit of a Colpitts VCO. Why you apparently think
these are obsolete is beyond me. All sine wave oscillators, LC or
crystal, are basically the same circuit with the only variable being
the location of the rf common point.

A lot of modern high voltage supplies would be better off if they had
swinging chokes in them. My "modern" 8877 amp power supply uses a
resonant choke.