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Coming Attractions
%adio %oc&s
E! Cur'e (racer
%adio Circuit )odel
)ineral Diodes * (+ingies
%ust Ne'er Slee,s
+y Diodes )atter
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In (+e .eginning
.efore integrated circuits###
.efore transistors###
.efore 'acuum tu/es###
.efore electronics###
### t+ere ere radios1
)odern radio /y E6A.
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433
(+e Sim,lest 3ossi/le %adio
Antenna
4round
Ear,+one
Detector
A) demodulator 5+u+7
A roc& on a +ard ,laceCrystal diode1
(uning 8a+1
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533
)ineral Sam,les
+o &ne
No/ody1
Conflicting stories
(ry all com/inations
)ost don9t or& at all
8o can you tell
Instrumentation1
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633
(+e .ig Idea
:am current 5I7 in
8o muc+
3olarity
)easure 'olts 57 across
%ange
3lot results; cur'es1
It can /e done manually
)ore fun automatically
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733
(+e =ittle Details
(riangle a'e in,ut
200 8z> ? ,ea&
oltage to Current
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833
Enlarged to S+o (eture
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933
Cat9s +is&er 3ro/e
)ineral in metal ,ot
ire ,in-,oint ,ro/e
Steel .ronze Car/on
-ais /all slide mount
S,ringy t+ing
3atience
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1033
8e +o Dies it+ (+e )ost Stuff###
-ais ,ositioner
0#00F resolution
0#GF accessi/le cu/e
!ero /ac&las+
.lac&-/elt dee/dom
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1133
3ro/e and Sam,le 8older
(elesco,ing /rass tu/es
(a,ered cloc& ,ins
S,ringy t+ing
E)( fitting
4ratuitous CNC
=o freHuency cli,s
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1233
Sam,le 8older
ood9s )etal
)a&es solid contact
.ut; PbJCdJ.iJSn
.ut; melts at 60 L
"se Lield9s )etal
Lriction-fit ,ro/e ti,s
Steel> /ronze> car/on
Small differences
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1333
Cali/ration M & %esistor
in,ut mA
Sco,e Aes
@ current 52 mAOdi'7
Y 'oltage 52 Odi'7
=inear1
+e
Set DC offset 0
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1433
Cali/ration M NP
:elly/ean Si diode
fd
0#G
3retty closeIre'
zilc+
=imited /y diff am,9sin,ut resistance
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1533
Iron 3yrite
4reen trace
Nearly a resistor
%ed trace
)ore li&e a diode
.lue trace
.ot+ /etter * orse
Same lum,1
3ro/e material
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1633
S,ice Circuit )odel
Diode sitc+
oltage controlled
)ay/e a lousy sitc+
%esistance from ,lots
% Q OQ I slo,e
C * %2 R ear,+one
8ig+ im,edance
2 A) signal1
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1733
A) Demodulation
=o 'oltage %L
(+is is /efore tu/es1
3oor diodes are
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1833
Iron 3yrite
8u+
Sorta !ener-is+
)arginal diode
Lor lo I * > anyay
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1933
=ead - 4alena
.ac&ards ,olarity
+ate'er t+at means
=o fd
.ronze ,ro/e
.est of a /ad sam,le
+o &ne)ay/e it9s Uust lead
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2133
C+alco,yrite
It9s a Diac1
.ilateral trigger diode
It9s a resistor1
Lor verylo I
Negati'e resistance
Current W oltage X
Note scale c+ange
G and G mA O di'
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2233
4al'anized Steel
3ro,ane torc+
=ittle /lac& s,ots
Do t+is outdoors1
Iron-tin-zinc alloy
Cadmium Ick!
=oo&s li&e +ig+ %
And not a diode
.ut ait
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2333
4al'anized Steel .estiary
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2433
%ust Ne'er Slee,s
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2533
Steel Corrosion
Nonlinear
Symmetric
Sorta> &inda
Negati'e resistance
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2633
=inear )iing Circuit
=inear miing
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=inear )iing %esults
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Nonlinear )iing %esult
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%L 's# (+e %usty .olt
)ountainto, radio
Manytransmitters
8ig+ %L field intensity
Sensiti'e recei'ers
4al'anized toers
Acid rain
Corrosion
Intermodulation1
BnLBmL
2B,L
B )t .eacon NY - 3+oto /y .2""
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3133
DIY Diodes
(+ey9re e'ery+ere
(+ey9re c+ea,
not t+at ,ositioner
(+ey9re easy> sorta
You9ll learn
a/out electronics
a/out ,atience
Demo: Sunday AM!!
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%eferences
)y column in Circuit Cellar magazine; #circuitcellar#com +as file of scri,ts> ,ictures> ot+er stuffLe/ruary * A,ril 200 descri/e nonlinear freHuency miing
Semiconductor cur'e tracer using 3C sound card; 4eorge Ste/er> .P=ICircuit Cellar> :an 200A%%= ZE@> :uly 2006; +tt,;OO#arrl#orgOHeO2006O0[OH[ste/er#,df
4ood o'er'ie of crystal-set ,arameters; +tt,;OO#oldradioorld#deOgollumOanalysis#+tm
!inc negati'e resistance oscillators; +tt,;OO+ome#eart+linnetO\lenyrOzincosc#+tm
4al'anic Series ta/le; +tt,;OO#ocean#udel#eduOseagrantO,u/licationsOcorrosion#+tml
ood9s metal> s,rings> ,+os,+or /ronze s+eet> tools from )icro)ar&; +tt,;OOmicromarcomO
(a,er ,ins and small ,arts from S# =a%ose> Inc; +tt,;OO#slarose#comO5dead on ? Aug 067
Ca,turing oscillosco,e traces it+ Kermit; +tt,;OO#colum/ia#eduO&ermitOinde#+tml
Con'erting 834= to /itma,s it+ +,2 utility; +tt,;OO#gnu#orgOsoftareO+,2O
http://www.circuitcellar.com/http://www.arrl.org/qex/2006/07/qx7steber.pdfhttp://www.oldradioworld.de/gollum/analysis.htmhttp://home.earthlink.net/~lenyr/zincosc.htmhttp://www.ocean.udel.edu/seagrant/publications/corrosion.htmlhttp://micromark.com/http://www.slarose.com/http://www.columbia.edu/kermit/index.htmlhttp://www.gnu.org/software/hp2xx/http://www.gnu.org/software/hp2xx/http://www.columbia.edu/kermit/index.htmlhttp://www.slarose.com/http://micromark.com/http://www.ocean.udel.edu/seagrant/publications/corrosion.htmlhttp://home.earthlink.net/~lenyr/zincosc.htmhttp://www.oldradioworld.de/gollum/analysis.htmhttp://www.arrl.org/qex/2006/07/qx7steber.pdfhttp://www.circuitcellar.com/8/12/2019 Home Made Diodes
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+o Am I
Ed Nisley
Say NISS-leeF> e'en t+oug+ myancestors ere +alf-essed
Engineer> aut+or> tin&er> family guyCircuit Cellar; A/o'e t+e 4round3lane - #circuitcellar#com
Analog * %L stuff
Dr Do//9s :ournal; Nisley9sNote/oo& - #ddU#com
Em/edded systems * +ardare stuff
Se,t 62
http://www.circuitcellar.com/http://www.ddj.com/http://www.ddj.com/http://www.circuitcellar.com/Top Related