On Mon, 25 Aug 2008 17:27:35 +0100, "ian field"
wrote:


"Spehro Pefhany" wrote in message
.. .
On Mon, 25 Aug 2008 16:25:02 +0100, "ian field"
wrote:

Anyone know the correct name of the oscillator which is essentially a
grounded base amplifier with a small capacitor from collector to emitter?

These are common in very cheap TV modulators and 433MHz keyfob and
wireless
doorbell buttons etc.

Any help appreciated.

TIA.


This one?

http://en.wikipedia.org/wiki/Colpitts_oscillator

None that I've seen so far have C2 as in the wiki entry.

C2 is free in a bipolar device.

RL