First, I don't believe there is such a thing as a 4 way rectifier, there is
however such a thing as a full wave rectifier.  You would be stepping down
120 VAC to 4.5VDC.  You might want to lookup full wave rectifier in your
electronics or circuits book.

Second go to motorola's website and down load the 2N2222A there isn't a
2N222A.  There should be some application notes in the back of the data
sheet.

Later
DW

        -----Original Message-----
        From:   *Crystale "The Angel" Vail* [SMTP:[log in to unmask]]
        Sent:   Monday, November 30, 1998 3:12 PM
        To:     [log in to unmask]
        Subject:        [DC] HELP!!!!

        Hello,
        I am a college student and this is my first time using the forum.

        Anyway, I need help with two engineering projects I have been
assigned.
        Don't worry, you won't be helping me to cheat or anything because we
have
        been advised to access all available resources.

        The first assignment is to build a power supply.  I don't even know
where
        to start!!!
        The power supply has to be able to run the tape deck of a walkman.
The
        transformer has to step the voltage down from 120Volts to about
4.5Volts.
        There's four diodes connected creating a 4-way rectifier.  Theres
also a
        resistor, capacitor, and zener diode connected in the circuit.

        The second assignment is to build a class A amplifier with maximum
        semetrical swing and 45dB of gain or more, using a 2N222A transistor
and 1
        meg of input impedeance or more.

        I don't even know what half of these things mean.  Also, for both
        projects, we need to find the values of all of the components, they
are
        not given.  Any help would be greatly appreciated.  Thank you for
your
        attention.


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
        Crystale Angel Vail
        Morgan State University
        1700 East Cold Spring Lane
        Harper-Tubman room 367
        Baltimore, MD 21251
        (410)319-1651
        [log in to unmask]

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
        "The thing that goes the farthest
        towards making life worth while,
        That costs the least, and does the most,
        is just a pleasant smile."
        --Wilbur D. Nesbit

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