== Electronic Components On-hand ==
These are some of the components available for testing.






















====== Variable Capacitors ======
^                               ^^^Typical^^
^Type^Nominal (pF)^Drive          ^Min^Max^
|   Air|        365|Direct         |    |     |
|   Air|        381|8:1 Planetary  |  14|  400|
|   Air|    320/380|6:1 Vernier    |    |     |
|   Air|  320/14.7/380/14.7|3:1 Vernier  |  12/9/12/9|345/25/405/25  |
|   Air|    480/505|6:1 Vernier    |    8/8|     520/500|
|  Plastic|     60/160|Direct  |  |  |
|  Plastic|    266/266|Direct  |  |  |
|  Piston, Hi-Q|  1-25|Direct  |  |  |
|  Compression|  6-50|Direct  |  |  |


====== Crystal Radio Inductors ======

Inductance needed for capacitor values.((<m>L_{mu H} = 25330.3/{C_{pF} {f_{MHz}}^2}</m>))


C=381+20=401 pF, f=520 kHz = 3.267e6 rad/sec<m>omega =1/{sqrt{L C}} right L=1/{C omega^2}=1/{401*10^{-12} *3.267^2*10^{12}}=234 mu H</m>


^Cmax^Cstray^L(520 kHz)^C(1710 kHz)|
^(pF)^ (pF) ^   (µH)   ^   (pF)    |
|  365|   20|       243|   36|
|  410|   20|       218|   40|
|  380/320|   20/20|       234/276|   40/20|








===== Torroid Winding =====

  * [[http://www.bytemark.com/products/iptcres.htm]|Iron Powder Toroidal Cores (For Resonant Circuits) ]]

^   Core   ^^    Winding   ^^^^Inductance (µH)^^
^          ^A<sub>L</sub>^Done^    Length   ^Layers^Turns*^  Calculated  ^ Measured  ^
^  2x[[http://toroids.info/FT23-43.asp|FT23-43]]|  2x158±20%|  |  15"?|  2|   //28//|    248|  |
^  f8FT23-43|  2x158±20%|  | 23"?|  2|   //2x28//|  248|  |
^    FT37-43|  350±20%|  |   17"|  1|  26|  237|  |
^    FT50-43|  440±20%|  |   19"|  1|  23|   233|  |
^    FT50-61|   69±20%|  |   42"|  1|  58|   232|  |
^    T130-2|   11±20%|  |   214"|  1|  145|   231|  |
^    T200-2|   12±20%|  |   266"|  1|  138|   229|  |

Giant Ferrite Bead Information
  * It takes about 20' of 30 gage wire to wind a giant bead fully (estimated 92 turns) for about 20 mH (measured 19.4 mH). [2007-11-13]
  * About 2.43"/turn
  * <m>uH={A_L *Turns^2}/1000 right A_L={1000 L}/{Turns^2}={1000*113}/{7^2}</m>=A<sub>L</sub>≈2300

Big Ferrite Torus
  * <m>uH={A_L *Turns^2}/1000 right A_L={1000 L}/{Turns^2}={1000*62}/{11^2}</m>=A<sub>L</sub>≈512
  * <m>Turns=sqrt{{1000 L}/{A_L}} = sqrt{{1000*184}/512}approx</m>19 turns

===== Other Coils =====


  * The [[http://www.midnightscience.com/cigar.html|cigar box radio]] coil is about 23 turns of #26 (or #24) around a 5½" x 9" x 2½" box, around 80' of wire.
  * 6' of 16-conductor [[http://journeytoforever.org/edu_xtal/PLANS2.HTM|ribbon cable]] makes a quick and dirty coil.

====== Joule Thief Transformers ======

Coils to Wind Twice with 30-gauge Wire

^   Core   ^^    Winding   ^^^^Inductance (µH)^^
^          ^A<sub>L</sub>^Done^    Length   ^Layers^Turns*^  Calculated  ^ Measured  ^
^   [[http://toroids.info/FT23-43.asp|FT23-43]]|  158±20%|  ✔|  10"|  1|   //14//|    31|  46|
^    FT23-43|  158±20%|    ✔|    |  2|   //28//|    124|  241|
^  2xFT23-43|  2x158±20%|  ✔|    |  1|   //14//|     62|  93|
^  2xFT23-43|  2x158±20%|   |    |  2|   //28//|    248|  |
^  f8FT23-43|  2x158±20%|  ✔|    |  1|   //2x14//|   62|  93|
^  f8FT23-43|  2x158±20%|   |    |  2|   //2x28//|  248|  |
^    FT37-43|  350±20%|  ✔|   30"|  1|  20|  140|  126|
^    FT37-43|  350±20%|   |   60"|  2|      42|   617|  |
^    FT37-61|   55±20%|  ✔|   31"|  1|  //21//|    24|  18|
^    FT37-61|   55±20%|   |   62"|  2|  //42//|    97|  |
^      T37-2|    4±5%|  ✔|   31"|  1|  //25//|   2.5|  UR|
^      T37-2|    4±5%|   |   62"|  2|  //50//|    10|  |
^      T37-6|    3±5%|  ✔|   31"|  1|  //25//|   1.9|  UR|
^      T37-6|    3±5%|   |   62"|  2|  //50//|   7.5|  |
^    FT50-43|  440±20%|   |   50"|  1|  //36//|   570|  |
^    FT50-43|  440±20%|  ✘|  112"|  2|  //72//|  2281|  --|
^    FT50-43|  440±20%|  ✔|   40"|  1|      28|   345|  367|
^    FT50-43|  440±20%|  ✔|   36"|  1|      24|   253|  277|
^    FT50-43|  440±20%|  ✔|   30"|  1|      20|   176|  190|
^    FT50-61|   69±20%|  ✔|   56"|  1|  //36//|    89|  69|
^    FT50-61|   69±20%|   |  112"|  2|  //72//|   358|  |
^     T50-26|         |   |   56"|  1|  //36//|    41|  |
^     T50-26|         |  ✔|   20"|  1|      21|    14|   11|
^      T50-1|   10±10%|  ✔|   56"|  1|  //36//|    13|  8|
^      T50-1|   10±10%|  ✔|  112"|  >2|  //72//|    51|  49|
^      T50-2|  4.9±5%|   |   56"|  1|  //36//|   6.4|  |
^      T50-2|  4.9±5%|   |  112"|  2|  //72//|    21|  |
^      T50-6|    4±5%|   |   56"|  1|  //36//|   5.2|  |
^      T50-6|    4±5%|   |  112"|  2|  //72//|    16|  |

  * μH = (AL*Turns²)/1000
  * * //Italics indicate a full winding.//
  * ✘ //Not tested.  The inductance is not appropriate for a joule thief.//
  * ✔ //Tested in a joule thief circuit.//
  * 2x indicates two cores stacked and wound together.
  * f8 indicates a figure-eight winding of two cores side-by-side.
  * UR indicates inductance too low for my cheap multimeter to register.

^     ^      Color   ^  u  ^Frequncy (MHz)^
^  -43^   Shiny Black|  850|    (0.5-30)    |
^  -61^  Dull Dark Gray|  125|  0.2-15  |
^  -26^  Yellow/White|     |    --    |
^   -3^          Gray|     |  0.050-0.5  |
^   -1^    Blue/Clear|   20|  0.5-5, 0.15-3   |
^   -2^     Red/Clear|   10|    2-30, 0.25-10  |
^   -6^  Yellow/Clear|  8.5|   10-50, 3-40  |

//Data adapted from [[http://partsandkits.com/ttoroids.html|Maximum Turns]],
 [[http://partsandkits.com/xtoroids.html|Toroid Windings for QRP projects]],
 Mike Czuhajewski's
 [[http://www.electronics-tutorials.com/basics/toroids.htm|Toroid Charts]], and
 Ian Purdie VK2TIP's
 [[http://www.electronics-tutorials.com/basics/toroidcharts_mcq.htm|"Toroids"]] page.//










====== Diodes ======
^   Part    ^Type^I<sub>F(AV)</sub>^V<sub>R</sub>^Rated V<sub>F</sub>*^V<sub>F</sub>@20mA,25ºC^Measured V<sub>F</sub>†^C<sub>T</sub>|
^           ^    ^  (A)            ^  (V)        ^         (V)        ^            (V)        ^   (V)         ^   (pF)  ^
^1N5817     |Schottky|            1|            20|               0.45|      0.23|  0.165|  125|
^1N5819     |Schottky|            1|            40|               0.45|      0.23|  0.205|  110|
^21DQ06     |Schottky|            2|            60|               0.55|     <0.32|  0.298|  120|
^MBR1100    |Schottky|            1|           100|               0.68|     <0.42|  0.299|   35|
^BAT46      |Schottky|         0.15|           100|               0.80|      0.51|  0.254|  6-10|
^1N34A?     |Schottky|              |            |              |     |  0.307|  |
^1N34A      | Ge |              |            65|           >1.00|     >1.00|  |  0.8|
^1N60       | Ge |              |            |               |      |  |  |
^1N60-odd   | Ge |              |            |               |      |  |  |
^1N60P      |Schottky|              0.5|            45|               0.84|      0.34|  0.279|  2-6|
^1N198      | Ge |              0.5|           100|               1.00|     >1.00|  0.278|   low‡|
^1N277      |  |                 |            |                   |            |    |   |
^1N277B     |  |                 |            |                   |            |    |   |
^"Unknown"  | Ge |               --|            |                 --|        --|  0.364|   --|
^"Mystery"  | Ge |               --|            |                 --|        --|  0.293|   --|
^           |  |                 |            |                   |            |    |   |

  * *Usually @I<sub>F(AV)</sub>, T<sub>J</sub>=125ºC
  * †Measured with cheap multimeter, probably at about 1.25 mA
  * ‡Observed to be similar to 1N34A.









====== Transistors ======

^  Part  ^Polarity^Material^V<sub>FBE</sub>^V^I<sub>C,max</sub>^h<sub>FE</sub>^f<sub>T</sub>^Use Coil^Package^
^        ^        ^        ^     V         ^  V^  mA   ^             ^  MHz        ^µH^  ^
^  ГТ402Б|     PNP|Ge      |          0.201|  25|   500|      60-150  |   1|  | {{electronics:bip051.gif?80|Russian Package bip-51}} |
^  ГТ404Б|     NPN|Ge      |          0.168|  25|   500|      60-150  |   1|  | {{electronics:bip051.gif?80|Russian Package bip-51}} |
^  гт4125|     PNP|Ge      |          0.260|  24|   500|           ≥70|   2|300-600|  |
^  2N1017|     PNP|Ge      |          0.226| ?10|   400|       20-30  |  20|20-400|  |
^  1T321E|     PNP|Ge      |          0.128|  40|   200|      80-200  |  60|  | {{electronics:bip019.gif?80|Russian Package bip-19}} |
^  Кт321Б|     PNP|Si      |          0.646|  50|   200|      40-120  |  60|  | {{electronics:bip019.gif?80|Russian Package bip-19}} |
^  SFT131|     PNP|Ge      |          0.166|  24|   500|           ≥70|   2|  |TO-5var|
^   MP26A|     PNP|Ge      |          0.212|  70|   400|      20-40   |  0.2|  |TO-9  |
^        |        |        |               |    |      |              |    |  |  |

  * Russian transistor information from the datasheet, vendor information, and  "Help parameters for the transistors of [[http://vicgain.sdot.ru/sptranzr/tranzrmm.eng.htm|low power]]" and "...[[http://vicgain.sdot.ru/sptranzr/tranzrsm.eng.htm|of average capacity]]".
  * Russian package illustrations from [[http://vicgain.sdot.ru/sptranzr/tranzrgab/tranzrgab.eng.htm|The Directory on Bipolar Transistors]].

"...the emitter-base junction possesses a slightly greater forward voltage drop than the collector-base junction."--[[http://www.faqs.org/docs/electric/Semi/SEMI_4.html#Diode%20check,%20meter%20function|Lessons In Electric Circuits -- Volume III, Chapter 4]]