Electronics > Projects, Designs, and Technical Stuff
Light Bulbs and LDRs in Audio Oscillators
Zenith:
I wrote it and by the time I'd found the reference and checked it through there were several more posts. There seemed no harm in posting it and it never occurred that it might for instance, call forth a response from a rude idiot. :-DD
unitedatoms:
--- Quote from: Zenith on February 17, 2019, 10:40:30 pm ---I wrote it ..
--- End quote ---
Right. I remember by being surprised how slow Cadmium-Selenide sensors are. That genrators are perfect application, even better than incadescent bulbs
I remember that class of inventions is named Parametric Components. For example DC -DC converters based on thermometric effect will give very low noise with very few components. Another example is matter phase state based thermal ovens like Metcal soldering iron or Oven for frequency standard crystal on old satellites, where transition of liquid polymer to solid is a stable point.
Benta:
--- Quote from: Zenith on February 17, 2019, 10:40:30 pm ---I wrote it and by the time I'd found the reference and checked it through there were several more posts. There seemed no harm in posting it and it never occurred that it might for instance, call forth a response from a rude idiot. :-DD
--- End quote ---
Frankly, with 12 posts, you're not really entitled to call long-time contributors "rude idiots". I'd say that you need to get a bit of experience with this forum. Just check the thread before you post.
Richard Crowley:
David Hess:
Jim Williams went into detail on this subject in his Linear Technology application note 43.
Light bulbs and LDRs have the advantage over FETs in low distortion gain control circuits because the drain voltage modulates the conductivity of the FET slightly. The result is that oscillators with an equivalent low distortion using FETs for gain control are much more complicated than the light bulb or LDR alternatives.
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