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Electronics Poetry - "Power Supply" | ||||||
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September 1942 QST
 [Table
of Contents]These articles are scanned and OCRed from old editions of the
ARRL's QST magazine. Here is a list of the
QST articles I have already posted. As time permits, I will
be glad to scan articles for you. All copyrights (if any) are hereby acknowledged.
It is really quite entertaining and instructive! It applies for the original tube-based circuit as well as for modern solid state versions. I somehow get the feeling that this poem will now be republished in many places. See all available vintage QST articles. Power Supply by Eileen V. CorridanThe how and why of a power supply Is something very quaint. It takes the a.c. current And makes it what it ain't. You start with good ole a.c. But you need some pure d.c. How the PS finally makes it Is now quite clear to me. First, gimme a primary winding; A secondary, too. Now I've got a transformer Let's see what it will do. The primary takes the line juice; Inductance does the rest. But you gotta split the secondary To do its job the best. "Less turns in the coil for the heater, More turns for the plate supply." We've still got only a.c. Which the tube will rectify. Now we come to the moment When tube and a.c. meet. Just keep in mind a rectifier Acts like a one-way street. A.c. travels in wave form From plus to minus, and then It simply changes direction And does it over again. But the tube says, "Nothing doing This is no swinging door. I'll take one-half of your wavelengths, One-half - and nothing more!" At least a half-wave rectifier Would act about that way. We'll use another plate in there And thus save wave and day. So now one plate says, "Come ahead." It takes its half-waves through The other plate is minus, then; It has no job to do. Then comes along the other half. The second plate starts working. So half and half are now a whole While number one plate's shirking. From filament to filtering The current that is flowing Is now d.c. - pulsating kind That toward the filter's going. It isn't pure by any means. Its ripples need some smoothing. Chokes and condensers serve for this; The waves find these quite soothing. The filter circuit works like this: In a condenser-input filter, Inductance and capacitance Keep pure d.c. in kilter. Pulsating d.c. also has Some a.c. current flowing. Condensers short the a.c. out, And chokes keep d.c. going. And so at last like Ivory Soap Our current's pure d.c. I must confess this whole darn thing Has made a wreck of me, see? Posted 3/21/2011 | ||||||
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