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Name that oscillator.

:: EPE Chat Zone ­:: ­Radio Bygones Message Board :: » EPE Forum Archives 2007-2009 » Archive through 07 September, 2008 » Name that oscillator. « Previous Next »

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ianfield
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Username: ianfield

Post Number: 10
Registered: 08-2007

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Posted on Wednesday, 27 August, 2008 - 04:32 pm:   Edit Post Delete Post Print Post    Move Post (Moderator/Admin Only)

Does anyone know the correct name of the common base oscillator whose feedback path is a small capacitor connected across collector and emitter?

It may be the capacitor coupled variant of a fairly common mixer/oscillator in pocket radios of the 70's era - this had a LO transfoemer (IFT) with 3 windings - a collector winding, an emitter winding and a tuning winding.

Unfortunately there is a bit of confusion over this oscillators name - Raymond Haigh oscillator series of articles (1999) calls it a Meissner oscillator while everyone on the net calls it a Reinartz oscillator.
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g6osv
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Username: g6osv

Post Number: 53
Registered: 05-2005

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Posted on Wednesday, 27 August, 2008 - 05:41 pm:   Edit Post Delete Post Print Post    Move Post (Moderator/Admin Only)

I think the Reinartz is the inductively coupled version,cant think of the name of the capacitively coupled version but will keep thinking.
Ian
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ianfield
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Username: ianfield

Post Number: 11
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Posted on Wednesday, 27 August, 2008 - 07:53 pm:   Edit Post Delete Post Print Post    Move Post (Moderator/Admin Only)

Thanks.
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boris
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Username: boris

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Posted on Sunday, 31 August, 2008 - 09:55 am:   Edit Post Delete Post Print Post    Move Post (Moderator/Admin Only)

Colpitts?

http://en.wikipedia.org/wiki/Colpitts_oscillator
Thank you for not breeding.
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ianfield
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Post Number: 12
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Posted on Sunday, 31 August, 2008 - 03:49 pm:   Edit Post Delete Post Print Post    Move Post (Moderator/Admin Only)

It could be a Colpitts if it uses the transistor's parasitic junction capacitance to replace the missing capacitor, but I'm thinking this oscillator type has a name of it's own.

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