[Milsurplus] Series or Parallel Resonant Crystal Oscillator?

[John Poulton]

Thanks!

Shoulda mentioned that this is the common-collector (or emitter follower)
form of the bipolar transistor Colpitts..  You can also build common-base
and common-emitter forms, the latter probably looking a bit more familiar.
All three forms can be found in the vacuum tube literature and in our
favorite boatanchors, as well.

73 K4OZY

On Wed, Jan 8, 2020 at 2:58 PM Kenneth G. Gordon <kgordon2006 at frontier.com>
wrote:

> On 8 Jan 2020 at 14:35, John Poulton wrote:
>
> > I believe this is a Colpitts oscillator, though it's drawn for maximum
> obscurity.  These use the
> > parallel resonance of the crystal.  C407/C408 are the
> impedance-splitting capacitors in the
> > feedback path.
>
> Absolutely correct....on all counts. Good on ya.
>
> Ken W7EKB
>
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