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    Electronics Poetry: "Power Supply"
    September 1942 QST Article

    September 1942 QST

     September 1972 QST  Cover - RF CafeTable of Contents

    Wax nostalgic about and learn from the history of early electronics. See articles from 's QST, published December 1915 - present. All copyrights hereby acknowledged.

    Electronics Poetry - "Power Supply", September 1942 QST - RF CafeOde on a Power Supply? Well, maybe not really an ode, but this poem entitled, "Power Supply," written by Eileen V. Corridan, appeared in the September 1942 edition of the ARRL's QST magazine. It is really quite entertaining and instructive! It applies to the original tube-based circuit as well as to modern solid state versions. I somehow get the feeling that this poem will now be republished in many places.

    Here are a few other electronics-themed poems: A Radioman's Nightmare, The Day Before Christmas, Sonnet of a Ham, Unpopular Electronics, Ode to a New Rig, Power Supply, More 'Tower' to You, Requiem, Pre-Radio, What Is It?, Ravin

    Power Supply

    by Eileen V. Corridan

     

    The 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 you500彩票手机快三在线投注 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 you500彩票手机快三在线投注 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 you500彩票手机快三在线投注r 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 February 6, 2020                             (original 3/21/2011)

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