Chaos Computer Club 1997 February/cccd_beta_feb_97.iso/chaos/habi1/txt/hb1_219.txt

Text File | 1997-02-28 | 7KB | 183 lines

    $~ ,~6 R ~ D BO X

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    C ONSTRUCTION

    The largest units in the .ed box are the telephone earpiece and battery. Since
    the unit works on ~V and has no coils, lOV parts can be used. The }»sh b~ttons
    are high qual~ty units tbat won't bonnce on you and fire the bo~c twice. Grayhil1
    makes some good ones. Snap action are the best, but they make nolse when you
    hold the box up to the phone.

    Different earpieces or speaXers will produce different volumes. If a low im-
    pedance (8-320hrns) speaker is used, less volume and more battery drain will
    result. Increase the velue of the 10 mid. output capacitor with low 1mpedance
    speakers, and increcse 22K gain resistor if necessary.

    Remember, with a red box you are going to play [t for an operator who vrill
    easily recognise a faul~ tone pulse. So make your solder connectlons ffght &
    use good svritches. Cover the spaaker holes wlth a small patch of ~in fo~m
    to prevent gook from ~y~ng into the magnet.

    OPERATING PRINCIPLES

    The red box consists of four sections, the oscillator, the f~p~]lop, ~e
    timer and the amplifier. To understand how these prodoce the necessary tones
    we'H take for example a dime sound. A dime is two pulses of2200 cycles, eech
    being 60 m;lleseconds long, wifh a 60 ms. space between then. When you press
    the 10╜ botton, the Oip-i~p starts turning on and off, on for 60 ms. and off for
    60 ms., continnausly. This in turn shor~ out the oscillator, producing on and
    o~ pulses to be fed to the amplifier and speaker. How do we get only 2 beeps7
    Well, when you press the button, the t~mer starts. After 180 ms. it turns ofE
    the ~ip~flop, thus stopping the tones. Other sonnds are produced by changing
    the speed of the Di~flop and the delay of the timer. Also, the two RC pairs of
    1M and . 047 pulse the timer and the shorting transistor, to start the timer and
    flip~Ilop at the same time . Current drain is approx. 7 ma, so don't worry
    about t~e battery. You wil1 hear some leakage after the tone sounds if you keep
    holding the button down, but this is alright if it's ~int or if you let go.

    TUNING

    First, ad~ust the 30K osc~ll~tor trimmer to produce a beep wLen a button
    is ~shed. Ihen, simply call a friend at a pay phone and ha~re him deposit money.
    I~ne the oscillator to the same pitch as the beeps you hear. If the oscill~tor is
    too high, raise the . 0033 cap to . 0047. If ~e range of t}ie trimmer is too small,
    add a 30K series resistor.

    Now, you should get one, two, and 5 beep~ for 5,10, and 25, If not, youtll
    need to adjust a bit. If you get only 4 beeps for 25, raise the 620K resistor.
    This may, however, change $he 5 and 10 beeps. l:he 680K resistor is the number
    of beeps for the dime, and the 120K is for the 5 button.

    The 150K resistor controls the speed of the ~lip-Eop for 25. If you get 5 beeps,
    but they're too slow compared to the phone your friend is at, you can speed
    them up by lowering it. This will give you more beeps, however, in the sarne
    period of time that used to give you 5 beeps. So then you should lower the 620K
    untI1 you get 5 beeps aguin, and then check for proper beeps on the other buttons.
    Al~.~ays adjust 25 £irst, ~en do 5 and 10
    5; = 60 on
    10~ 60 on, 60 o~, 60 on
    25~ 35 on, 35 off(5 times)
    C ALLING

    Go to a psy phone, dial your number direct(after depositing a dime)(or 20╜}
    and when the operator comes on she'll ask for more money, and possibly even
    return your dime. Now, very slowly and quietly put the red box up to the mouth-
    piece and press one button per coin, ~nd be sure to pause several seconds in
    between each ccin, just as if you were reaching for the money in your pocket
    and fumbling to put in the coins. If the operator gets suspicious lt could be for
    two reasons; first, you may be off tune or off sp~d. In that case tune lt. Sec-
    ond, the operator may be suspicious because in some areas a vlsual indicat-
    ion of insertion of coins is provided for the operator., So the ~perator rnay say
    something like ''I'm sorrv, str; but tbat didn't registern. Just mosey along to
    ar~other phone ~oth. Youell find the red bo~ is ~e safest box to use and easy
    and fun to use, too. Even the operator will thank you'








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    IMPORTANT NOTICE
    . . about the enciosed 1973
    telephone credit card.

    To make certain no unauthorized
    person ;s using your card. the tele-
    phone operators who handle credit
    card calls may ask you a question or
    two whenever you place such a call

    They're the type ol question that
    can be answered easi~y and quickly
    by a person having a credit card, but
    shouid discourage an unauthorized
    user Irom trying to complete the calt.

    We hope you~ll understand tbat our
    operators will be doing lhis for your
    protection and ours

    As an added precaution we urge
    you to treat this card as you do your
    other credit cards.

    · Notify your Business Off;ce
    representative at once if it is lost or
    stolen.

    · Do not give the card or number
    to anyone else to use

               Thank you for your ccoperalion.
                    (3) New Yo~l~lephone

    Since credit card owners are receiving
    these notices witb their new credit cards
    we can expect to play some games with
    the operators this year. Doolt sweat, the
    questions are only designed to scare you
    and make you han; up, thus giving it away.
    hongh you might get a few questions like
    the name of the company, cit,r or area
    code of the credit card number, you'l}
    ha~re no problem if you keep cool. Ihe
    operator knows at most the name of the
    city and area code ~ not the company's
    name. So have your number memori~ed,
    and if you need the code numbers for
    certain cities, get YIPL #8, and be sure
    to read our reprint on.making credit card
    calls. Also write in and tell us what kind
    of questions operators are aslär~g in your
    nart of the countrv.

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