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Chaos Computer Club 1997 February
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hb1_208.txt
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1997-02-28
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CON S TRÜC TION
[hc~ ~ltIt' 1~Ä I'~'S t~o t~`s per digit. '~e
sh~w nne t,~-i 11:~`r an`! a co~nmor~ an~'ZliFicr,
h<'t h l~t' i r~g t u r nL kl `~' wh~ 't ~ I,e pushhu t t on
~n~ls .~\ thru ti~` ;IlL)LILS' O!Z~ for e.teh of
the t,~u `~-citI;linrstEnr tI,at l.uttons di`~`t)
.l~l~l n~c l`'r tl~c~ :'nrplit~icr. .`l. ~lioJc~ are
tlit"lt t,~' :~] L`IZ-01 ~ ~hit LIZ ('IZ tI`c .aml, Iets
~ L'~! [' ~ t' i111 1 \ _ I ~ ~,~.t t ~ I\L~LI ~ j l j C OIZ ) . Fl~t. `\C~ t
- 1~'.t ~t' ~ i ~ .' t U I C J1lliUlL' t'.' ~ |) i CCt', li.~L IZ t (~'
' i W` t IZI-~, ;' I . ~ ~ L ~ j j t k) ~ . .~'~K SC t ~ <;' i !~ .
''r i ~ t t'~! ~ L`~It \~~.' j'; ''r~`l`~- 10 ~'i I I i.~'l`~.
ÖSC i ll.it<~t t leq~e'~ ~ - lt~. ll~C,wher~ tI~'
k/~ ~ ~t is i~l j~`ste~l t~, cl~e point of oseil-
I.1t ic~n. This paint h.ls no dist`~rt-ion, and
(IW 1~lC~rlC\! C~' L;C IL1i~U~L ~listorticn
~{ S ;~. FOr 1SL)LI us: Jes,an`1 ~ .L}022, R=
.lbant lt,l~ul~'ns. Raisi', l R to I ~K(the nexc
llitl}test St .\Uda - 'Z val~le) lower i the freq-
ueney, and yau can now tunc u~ to 1500 E{~.
Dist`~rti~ `.,ill be very l~w.~C wil1 le
(10-1., .lnd R/2 will be 22X, 5a use a 50K
pot. Witn S~r'~'e 1~21 capacitors, ti~is
Twin-T · .;.illator is re_lly ·JOCu. Try it!
To si~nplity the ~iiede jungle, use a n~arrix
by sa~ldwichirlg the di`~'es between two pieces
af perforated circuit board, one witl~ 13
"buss"li~Zes to the swiraties arZd the other
witiZ t~ output lines, 7 for oscillators and
or~e for the a;`plif ier. ActucZlly, since 2600
is a sin~le tone, you don't need a diode for
it, so rnatrix can bc 12 X 7 The diodes are
uprigt~t inside tt,e two boards. Watch polarity.
Readers Z,rave reparted that an integrated
circuit exists that use I a resistor for
eech t one, two va riable osc i llat ors be ing
required for a box. TIZe Signeties 566 is
also reported to be unstable wich tempera-
ture variae ic~'s. For plans on bu ilding with
it, Write to Sign~tics,811 E. Arques Ave.,
Sunnyvv~le, Ca. t3- 066 a~Zd ask for information
on ti~e 56b VCO and applications notes. Sign
your name Joe Smith, Enq.
T UN I NG
Notes on an organ will actually wor}` if
you use thern, but they~re best used for
tuning. Or,use a touct~ tone ph.one for
tuning your box, cr your signal gener-
ator. Play your osciLlatcr and yc~ur source
of p~tch and adjust till t'beats" ~ust stop.
Remember there are two tones per digit.
If you tune wich an organ, you must be able
to interpolate, that is to set the pitch in
between two different orgah notes. To set the
900 oscillator, it shouid be between the A and
the A#.
OPERATION
Fron~ ~ p~y phone,~al long distance info-
rmation, or an 800 numher, whichever you
can get. from vour city. As call goes thru,
prcsc 7600 f~r one seconJ, and when you
hear a clicl; ~tial desire] nu~ber, preceel-
ed hy k17 and followed by ST. E-xample-
ki7415686991~ST. Each pulse i~ the sa~e as
if ~nll werc using .a pushbutton phone. A11
pu~ses must he sent within 10 seconds of
disconnäct, if not, disconnect and try
again. Do not stay on longer than necessary.
~tY ,r - H8urto~
_ .
_ '~ ~ t' .
. ~lk
_ _ ─ ─ . _~,
1.
1 C
1 ~─
I ~ - ~ ~ '
__ _ _ ~
OlfE oselL`^ro8'
7 NEIDRD
Fe I
2' P'C
1t . n ~egehms
C ir) ~<rofo - J~s
15R ~
.021 ~R
\\ ~ v~^
11 ,
_~
~ 4lK
' Lt7\(
V~ 5/lOV
~ ~ -~]
~ ;~ L
71`fPt~l ~
F4t,1Ec! ~ !,
1
~JI ~M' \~11' ~v;~il.~l~le at 1'olvEuLs,Bo.< q17l~l`>r~fLeId,~lass. 01940
t~r.ler 741l, 1~-5 casc, 2 lor qn╜, a~lJ 25~ posta~c anl wait. hrite
lor c;rtalo~ Ei'st as the~ ma' requLrc !'i'~iu`~n orÜcr.
Xtl resistors 1/1 hätt,5 ~. (al~acitors ~cco'~n~cn;1eJ-Spraguc 19~1',
sil`-crc<1 n~ic;1, or '~ic.1(lil,pe`1).
The values of R shouid be between 30K £ 1501C.
Hep 54, 2N2222,or RGA SK3020 transistors.
Diodes-~.atched smali signal silicon(~9l4)
7~1 OPAMP-TOPVIEW
D I P
~J
I_~°
Organ Notes
Note l rc~llel~c~
~ 5 ~ 9 ~
,t ~ ~ O
(:` ~ ~ 09
6 1~19
~0
~C 1661
1 7 '637
Touch-Tone
'209 1336 1477
697 1 2 3
770 ~5 6
852 7 8
9ll * 0
ro s
Plt.
DIP
Blne Box Tones
pJ~it I.requencies
17()0~90()
700+ 1 100
900~1100
~7 0 0+ 1 3 110
5qon+ 13DO
~] Inn~l300
77011+ 1500
sn(l~lsoo
~1 1 00+ 1 SOO
01 30n~ 15~1()
l~i'1 1 00.1 700
ST150061700
[lisconnect - 2600
A 16 button keyboard with no moving
parts, ~,easuring 3X3X 1~2, is avail-
able f rom Environ~`ental Products,
Box 4C6, Lafayette, In. 47902. The
price is $7.95 but write for their
catalog before you order it. Also,
if any readers know wLere to obtain
thirner keyboa~s, please write us
with details. By the way, lG buttons
is perfect for a comblnation blue
box/red box.
Line earpiece with fo~, ~d press it to
mouthp iec e ti~htly.
The smartest phone phreaks we know seldo~
carry their unit with them, but rather a
cassette reco~er, which they erase after
making their call.
All numbers directly dialable are callable
with the box. Overscas inst~ctions will be
forthcoming.