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Simple, low distortion 1kHz oscillator
Simple, low distortion 1kHz oscillator
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Old 5th October 2003, 09:17 PM   #1
jackinnj is offline jackinnj  United States
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Simple, low distortion 1kHz oscillator
Default Simple, low distortion 1kHz oscillator

For anyone in search of a low distortion oscillator, this is the section from the Krohn-Hite 6900B Distortion Analyzer. THD measures 0.002% on both the KH and my HP339b Disto Analyzers.

For a nice simple circuit it compares favorably with the analyzer in the HP339b which is 0.0018% (although the latter is adjustable).
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Old 5th October 2003, 09:43 PM   #2
tschrama is offline tschrama  Netherlands
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Hi,

Thanx for that circuit! I'm actually busy designing something very similar after a JLH (p. 193 (?) of his book 'audio elec.') circuit which also uses a doubleT-notch filter but a BJT for the feedback signal.

I'm going to try to use a light-bulb for the amplitude stabilisation.

Any suggestions how to do that?

Thanks and greetz,
Thijs
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Old 6th October 2003, 03:15 AM   #3
kilowattski is offline kilowattski  United States
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Quote:
Originally posted by tschrama
I'm going to try to use a light-bulb for the amplitude stabilisation.

Ala the old HP 200CD audio oscillator. HP's first product ever, the HP200CD Audio Oscillator, back in 1939 used an incandecent lamp for amplitude stabilisation. Disney was their first big customer. The rest is history.
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Old 6th October 2003, 03:48 AM   #4
JOE DIRT® is offline JOE DIRT®  Canada
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#327 bulb by chance?
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Old 6th October 2003, 03:58 AM   #5
tschrama is offline tschrama  Netherlands
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I use a 3Watt/220Volt types lamp... they work wonderfully in my simple wienbridge oscilator.. giving a reliable 0.005% at 2Vpp.

I was planning this kind of lamp also in a parrallel-T oscilator.. still gotta figure how I will do that....

G,
Thijs
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