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Old 28th October 2004, 05:26 AM   #11
Serow is offline Serow  Canada
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Join Date: Feb 2002
Location: Regina, SK, Canada
RHosch, I believe you mixed up the spring and the mass. The spring stores potential energy like a capacitor, and a mass resists change in velocity like a inductor resists change in current.

There is a whole research area dedicated to these analogies, called Bond Graph theory. See here: http://www.bondgraphs.com/about.html
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Old 28th October 2004, 06:59 AM   #12
Jennice is offline Jennice  Denmark
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74Elsinore,

I would also recommend ESP's (Rod Elliot's) site. He knows what he's doing, for sure!

Secondly, you might want to download the Notes on DIY audio PDF file from:
ftp://sylvest.dyndns.dk/
(there's only one to choose). I have an op-amp description in there, too.

As for your first project, I would not recommend tubes. The circuits involve higher voltages, and if you're not experienced, I wouldn't go down that route (not being a tube dude myself, only judging by schematics I've seen).

For transistor (solid state) amplifiers, you will only need transformers for the power-supply, and don't need to think too much about impedence matching in the engineeering manner.
In the power supply unit (PSU), the transfomer converts the voltage from the wall outlet (often 110 or 230V depending on country) to a voltage that is lower and more convenient to work with. Also, a transformer (except autotransformers (I think you call them that) gives insulation from the mains potential.

Finally, for this post, DIY is about safety margins in a design, including the PSU.

Jennice
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