Mystery Project update 2 "The Time Vampire"
2012年2月26日日曜日
2012年2月17日金曜日
初心者のための電子キット
ＤＥＮＳＨＩ ＫＩＴ
| 作って完成させて遊ぶのではなく、 生涯役立つ知識を習得するための、初心者向けキット！ | |
電子工作用の、キットを作ってみたけど、全然回路が分からない！ と、よくお話を聞きます。 この電子キットのホームページは、 「初心者向けの回路」 「教科書に掲載されている回路」 「分かりやすい回路」 をメインにして開発した、オリジナル電子工作キットを、通信販売しています。 「電子回路を学びたい方」 「工業高校の学生」 「新人技術者教育」 などの教材として最適です。 本キットの基本回路の知識をマスターすると、 一生涯、電子回路の理解で、とても役だつ知識が得られます！ ーーーーーーーーーーーーーーーー エレラボドットコム 電子工作の知恵袋 | |
2012年2月10日金曜日
2012年2月5日日曜日
2012年2月4日土曜日
リンク：バルサの種類
Understanding the properties of Commercial Balsa
about Balsa
In selecting balsa sheets for need, it is important to consider the way the grain runs through the sheet as well as the weight of the sheet as we discussed above. The grain direction actually controls the rigidity or flexibility of a balsa sheet more than the density does. The following chart illustrates the 3 basic grain types for sheet balsa and lists the most appropriate uses for each.
A-Grain sheet balsa has long fibers that show up as long grain lines. It is very flexible across the sheet and bends around curves easily. Also warps easily. Sometimes called “tangent cut”. This cut should be used for sheet covering rounded edges, planking, forming tubes, strong flexible spars.
B-Grain sheet balsa has some of the qualities of both type A and type C. Grain lines are shorter than type A, and it feels stiffer across the sheet. It is a general purpose sheet and can be used for many jobs. Sometimes called “random cut”.
Use for flat fuselage sides, trailing edges, wing ribs, formers, planking gradual curves, wing leading edge sheeting in model aircraft.
C-Grain sheet balsa has a beautiful mottled appearance. It is very stiff across the sheet and splits easily. But when used properly, it helps to build the lightest strongest models. Most warp resistant type. Sometimes called “quarter grain”.
Use for sheeting balsa and foam wings and tails, flat fuselage sides, wing ribs, formers, trailing edges in model aircraft.
Balsa Weight for Various Densities
Balsa is one of the lightest woods available, and in many respects has the highest strength-to-weight ratio of any wood - even oak. The chart at the right gives a comparison of a few familiar wood types.
Hobby grade balsa is harvested in the jungles of Ecuador, kiln dried, cut into large blocks, and shipped to the U.S. for final cutting and sanding. Most balsa from hobby shops is in the 8-10 lbs/ft3 realm. The rock-hard stock that nobody wants is sent to the airplane kit manufacturers ;-)
Before being discovered as an ideal source of wood for model airplanes, balsa trees were cut and assembled into raft for floating down the river. In fact, the word "balsa" is Spanish for the word "raft." Balsa has been widely used by the military for air-drop pallets, and in fact, during World War II, balsa wood for models became scarce because the Army Air Force needed it for operations. Bamboo and other reeds were tried by modelers as a substitute wood, but it never could replace balsa.
The charts below for weights of standard hobby shop balsa sheets, sticks and blocks were calculated from a simple formula that takes the density of the of each piece of balsa and multiply it by the volume. For 48" lengths, multiply each 36" value by 4/3 (1.333).
Example:
A 3/16" x 3" x 36" sheet of balsa has a volume of 20.25 cubic inches (in3), which is equal to 0.01171875 cubic feet (ft3). A piece of balsa with a density of 8 lbs/ft3 is the same as a density of 128 oz/ft3. So, to find the weight of the balsa sheet, multiply 128 oz/ft3 by 0.01171875 ft3 to get 1.500 oz. A 48" length would weigh 1.500 oz. x 4/3 = 2.000 oz.
BALSA SHEETS
Weight in Ounces, Density in Pounds/Foot3
BALSA BLOCKS
Weight in Ounces, Density in Pounds/Foot3
BALSA STICKS Weight in Ounces, Density in Pounds/Cubic3
販売店
specialized Balsa Wood, LLC
Specially Weighed Balsa Sticks
Balsa Wood Laser Cutting Quote
(追加料金(40～150%）でグレイン、比重の指定が可能。一番品揃えも多そう。）
http://www.lonestar-balsa.com
(追加料金でグレイン、比重の指定が可能。$25Minimum Order）
Balsa USA
http://www.dbalsa.com/
http://www.nationalbalsa.com/
The different “grades” of the wood.
Grade | Ultra Light | Light | Light Medium | Medium | Medium Hard | Hard |
Density in lb/cu.ft | 4 - 5.4 | 5.5 - 6.0 | 6.1 - 7.5 | 7.6 - 9.5 | 9.6 - 12 | 14 + |
“Contest” grade balsa | ||||||
Suggested uses of the different grades of Balsa
Ultra Light 4 - 5.4lb |
|
Light 5.5 - 6.0lb |
|
Light medium 6.1 - 7.5lb |
|
Medium 7.6 - 9.5lb |
|
Medium hard 9.6 – 12lb |
|
Hard 14+ |
|
：
about Balsa
In selecting balsa sheets for need, it is important to consider the way the grain runs through the sheet as well as the weight of the sheet as we discussed above. The grain direction actually controls the rigidity or flexibility of a balsa sheet more than the density does. The following chart illustrates the 3 basic grain types for sheet balsa and lists the most appropriate uses for each.
A-Grain
 |  |
B-Grain
 |  |
Use for flat fuselage sides, trailing edges, wing ribs, formers, planking gradual curves, wing leading edge sheeting in model aircraft.
C-Grain
 |  |
Use for sheeting balsa and foam wings and tails, flat fuselage sides, wing ribs, formers, trailing edges in model aircraft.
Balsa Weight for Various Densities
Balsa is one of the lightest woods available, and in many respects has the highest strength-to-weight ratio of any wood - even oak. The chart at the right gives a comparison of a few familiar wood types.
Hobby grade balsa is harvested in the jungles of Ecuador, kiln dried, cut into large blocks, and shipped to the U.S. for final cutting and sanding. Most balsa from hobby shops is in the 8-10 lbs/ft3 realm. The rock-hard stock that nobody wants is sent to the airplane kit manufacturers ;-)
Before being discovered as an ideal source of wood for model airplanes, balsa trees were cut and assembled into raft for floating down the river. In fact, the word "balsa" is Spanish for the word "raft." Balsa has been widely used by the military for air-drop pallets, and in fact, during World War II, balsa wood for models became scarce because the Army Air Force needed it for operations. Bamboo and other reeds were tried by modelers as a substitute wood, but it never could replace balsa.
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Example:
A 3/16" x 3" x 36" sheet of balsa has a volume of 20.25 cubic inches (in3), which is equal to 0.01171875 cubic feet (ft3). A piece of balsa with a density of 8 lbs/ft3 is the same as a density of 128 oz/ft3. So, to find the weight of the balsa sheet, multiply 128 oz/ft3 by 0.01171875 ft3 to get 1.500 oz. A 48" length would weigh 1.500 oz. x 4/3 = 2.000 oz.
BALSA SHEETS
Weight in Ounces, Density in Pounds/Foot3
| 36" Length | 6 | 8 | 10 | 12 | 14 | 16 |
| 1/32"x2" 1/32"x3" 1/32"x4" | 0.125 0.188 0.250 | 0.167 0.250 0.333 | 0.211 0.313 0.417 | 0.250 0.375 0.500 | 0.291 0.438 0.583 | 0.333 0.500 0.667 |
| 3/32"x2" 3/32"x3" 3/32"x4" | 0.375 0.563 0.750 | 0.500 0.750 1.000 | 0.625 0.938 1.125 | 0.750 1.125 1.500 | 0.875 1.313 1.750 | 1.000 1.500 2.000 |
| 3/16"x2" 3/16"x3" 3/16"x4" | 0.750 1.125 1.500 | 1.000 1.500 2.000 | 1.250 1.875 2.500 | 1.500 2.250 3.000 | 1.750 2.625 3.500 | 2.000 3.000 4.000 |
| 3/8"x2" 3/8"x3" 3/8"x4" | 1.500 2.250 3.000 | 2.000 3.000 4.000 | 2.500 3.750 5.000 | 3.000 4.500 6.000 | 3.500 5.250 7.000 | 4.000 6.000 8.000 |
| 1/16"x2" 1/16"x3" 1/16"x4" | 0.250 0.375 0.500 | 0.333 0.500 0.667 | 0.417 0.625 0.833 | 0.500 0.750 1.000 | 0.583 0.875 1.167 | 0.667 1.000 1.333 |
| 1/8"x2" 1/8"x3" 1/8"x4" | 0.500 0.750 1.000 | 0.667 1.000 1.333 | 0.833 1.250 1.667 | 1.000 1.500 2.000 | 1.167 1.750 2.333 | 1.333 2.000 2.667 |
| 1/4"x2" 1/4"x3" 1/4"x4" | 1.000 1.500 2.000 | 1.333 2.000 2.667 | 1.667 2.500 3.333 | 2.000 3.000 4.000 | 2.333 3.500 4.667 | 2.667 4.000 5.333 |
| 1/2"x2" 1/2"x3" 1/2"x4" | 2.000 3.000 4.000 | 2.667 4.000 5.333 | 3.333 5.000 6.667 | 4.000 6.000 8.000 | 4.667 7.000 9.333 | 5.333 8.000 10.667 |
BALSA BLOCKS
Weight in Ounces, Density in Pounds/Foot3
| 36" Length | 6 | 8 | 10 | 12 | 14 | 16 |
| 1"x1" 1"x1½" 1"x2" 1"x2½" 1"x3" | 2.000 3.000 4.000 5.000 6.000 | 2.667 4.000 5.333 6.667 8.000 | 3.333 5.000 6.667 8.333 10.00 | 4.000 6.000 8.000 10.000 12.000 | 4.667 7.000 9.333 11.667 14.000 | 5.333 8.000 10.667 13.333 16.000 |
| 2"x2" 2"x2½" 2"x3" | 8.000 10.00 12.00 | 10.666 13.333 16.000 | 13.333 16.667 20.000 | 16.000 20.000 24.000 | 18.667 23.333 28.000 | 21.333 26.667 32.000 |
| 3"x3" 3"x4" | 18.00 24.00 | 24.00 32.00 | 30.000 40.000 | 36.000 48.000 | 42.000 56.000 | 48.000 64.000 |
| 1½"x1½" 1½"x2" 1½"x2½" | 4.500 6.000 7.500 | 6.000 8.000 10.00 | 7.500 10.000 12.500 | 9.000 12.000 15.000 | 10.500 14.000 17.500 | 12.000 16.000 20.000 |
| 2½"x2½" 2½"x3 | 12.500 15.000 | 16.667 20.000 | 20.833 25.000 | 25.000 30.000 | 29.166 35.000 | 33.333 40.000 |
BALSA STICKS Weight in Ounces, Density in Pounds/Cubic3
| 36" Length | Qty. | 6 | 8 | 10 | 12 | 14 | 16 |
| 1/16"x1/16" 1/16"x3/32" 1/16"x1/8" 1/16"x3/16" 1/16"x1/4" 1/16"x3/8" 1/16"x1/2" | 16 16 8 8 4 4 2 | 0.125 0.188 0.125 0.188 0.125 0.188 0.125 | 0.167 0.250 0.167 0.250 0.167 0.250 0.167 | 0.208 0.312 0.208 0.312 0.208 0.312 0.208 | 0.250 0.375 0.250 0.375 0.250 0.375 0.250 | 0.292 0.438 0.292 0.438 0.292 0.438 0.292 | 0.333 0.500 0.333 0.500 0.333 0.500 0.333 |
| 1/8"x1/8" 1/8"x3/16" 1/8"x1/4" 1/8"x3/8" 1/8""x1/2" | 4 4 4 2 1 | 0.125 0.188 0.250 0.188 0.125 | 0.167 0.250 0.333 0.250 0.167 | 0.208 0.312 0.416 0.312 0.208 | 0.250 0.375 0.500 0.375 0.250 | 0.292 0.438 0.538 0.438 0.292 | 0.333 0.500 0.667 0.500 0.333 |
| 1/4"x1/4" 1/4"x3/8" 1/4"x1/2" 1/4"x3/4" 1/4""x1" | 1 1 1 1 1 | 0.125 0.188 0.250 0.375 0.500 | 0.167 0.250 0.333 0.500 0.667 | 0.208 0.312 0.416 0.625 0.832 | 0.250 0.375 0.500 0.750 1.000 | 0.292 0.438 0.583 0.876 1.166 | 0.333 0.500 0.667 1.00 1.333 |
| 1/2"x1/2" 1/2"x1" | 1 1 | 0.500 1.000 | 0.667 1.333 | 0.832 1.666 | 1.00 2.00 | 1.166 2.333 | 0.1333 2.667 |
| 3/32"x3/32" 3/32"x1/8" 3/32"x3/16" 3/32"x1/4" 3/32"x3/8" 3/32"x1/2" | 8 8 4 4 2 2 | 0.141 0.188 0.141 0.188 0.141 0.188 | 0.188 0.250 0.188 0.250 0.188 0.250 | 0.234 0.312 0.234 0.312 0.234 0.312 | 0.281 0.375 0.281 0.375 0.281 0.375 | 0.326 0.438 0.326 0.438 0.326 0.438 | 0.375 0.500 0.375 0.500 0.375 0.500 |
| 3/16"x3/16" 3/16"x1/4" 3/16"x3/8" 3/16"x1/2" 3/16"x3/4" 3/16"x1" | 2 2 2 1 1 1 | 0.141 0.188 0.281 0.188 0.281 0.375 | 0.188 0.250 0.375 0.250 0.375 0.500 | 0.234 0.312 0.469 0.312 0.469 0.625 | 0.281 0.375 0.563 0.375 0.563 0.750 | 0.326 0.438 0.656 0.438 0.656 0.876 | 0.375 0.500 0.750 0.500 0.750 1.000 |
| 3/8"x3/8" 3/8"x1/2" | 1 1 | 0.281 0.375 | 0.375 0.500 | 0.469 0.625 | 0.563 0.750 | 0.656 0.876 | 0.750 1.000 |
| 3/4"x3/4" | 1 | 1.125 | 1.500 | 1.875 | 2.250 | 2.625 | 3.000 |
販売店
specialized Balsa Wood, LLC
Specially Weighed Balsa Sticks
Balsa Wood Laser Cutting Quote
(追加料金(40～150%）でグレイン、比重の指定が可能。一番品揃えも多そう。）
http://www.lonestar-balsa.com
(追加料金でグレイン、比重の指定が可能。$25Minimum Order）
Balsa USA
http://www.dbalsa.com/
http://www.nationalbalsa.com/
リンク：鉱石ラジオ
ラジオの原点はこれだ！
方鉛鉱 (Galena)
黄鉄鉱 (Pyrite)１
黄鉄鉱 (Pyrite）２
＊＊＊ 鉱石ラジオを作りましょう ＊＊＊
最も高感度な検波器ができる方鉛鉱
方鉛鉱の次によく使われる黄鉄鉱
と組み合わせると安定度抜群の検波器ができる紅亜鉛鉱
鉱石検波器ユニットの詳細
売店コーナー
鉱石検波器
自分でも作れる鉱石検波器
日常用品で作ったコイル
銀河通信社(アーティスト 小林健二氏によるキット）
鉱石ラジオ完全キット 銀河3型 CR029G-3 4,800円
鉱石検波器A （GALENA) 2,000円
ＳＴＡＲ印 鉱石検波器
アメリカのBlende Crystal of Radio Corp N.Y. U.S.A.の製品。
「鉱石検波器の自作
鉱石検波器を自作したいと計画中の方がいると思います。
自作には黄鉄鉱をお勧めします。
方鉛鉱は止めた方が良いようです。
真面目に検討したわけでは有りませんが、鉱物見本の方鉛鉱は検波能力が悪いようです。
不思議に思って調べると、どうも方鉛鉱は人工的に処置したものでないと実用的に使える検波器には出来ないようです。
検波器に使えるとしても、産地が問題で特定の産地（鉱山）の物でないと駄目等という事になりそうです。
子供の頃使ったＦＯＸＴＯＮ等の鉱石検波器は、どうも人工方鉛鉱を使ったものらしい。」
BORDEN RADIO COMPANY WWW.XTALMAN.COM
鉱石ラジオ Crystal Radio
いろいろな鉱石ラジオ
石売ってるところ：
リンク１
リンク２Detector Parts
リンク３：イギリスのサイト Detector 、石各種
参照：「やる夫の鉱石ラジオ 第4回 「検波器の理屈と作成,、そして完成へ？」
last
方鉛鉱 (Galena)
黄鉄鉱 (Pyrite)１
黄鉄鉱 (Pyrite）２
＊＊＊ 鉱石ラジオを作りましょう ＊＊＊
最も高感度な検波器ができる方鉛鉱
方鉛鉱の次によく使われる黄鉄鉱
と組み合わせると安定度抜群の検波器ができる紅亜鉛鉱
鉱石検波器ユニットの詳細
売店コーナー
鉱石検波器
日常用品で作ったコイル
銀河通信社(アーティスト 小林健二氏によるキット）
鉱石ラジオ完全キット 銀河3型 CR029G-3 4,800円
ＳＴＡＲ印 鉱石検波器
アメリカのBlende Crystal of Radio Corp N.Y. U.S.A.の製品。
鉱石検波器を自作したいと計画中の方がいると思います。
自作には黄鉄鉱をお勧めします。
方鉛鉱は止めた方が良いようです。
真面目に検討したわけでは有りませんが、鉱物見本の方鉛鉱は検波能力が悪いようです。
不思議に思って調べると、どうも方鉛鉱は人工的に処置したものでないと実用的に使える検波器には出来ないようです。
検波器に使えるとしても、産地が問題で特定の産地（鉱山）の物でないと駄目等という事になりそうです。
子供の頃使ったＦＯＸＴＯＮ等の鉱石検波器は、どうも人工方鉛鉱を使ったものらしい。」
BORDEN RADIO COMPANY WWW.XTALMAN.COM
鉱石ラジオ Crystal Radio
いろいろな鉱石ラジオ
石売ってるところ：
リンク１
リンク２Detector Parts
リンク３：イギリスのサイト Detector 、石各種
参照：「やる夫の鉱石ラジオ 第4回 「検波器の理屈と作成,、そして完成へ？」
last
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