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Monday, 23 September 2013

How to Perform the Missing Card Illusion

By thinknut.blogspot.com


 is currently testing new software that  a reader's preferences based on themotion the reader uses to scroll down through aweb page. To help us test this program, please choose a card from one of those at right (there is no need to click on it, just make a mental note of it). Now scroll down to the picture below before reading the rest of this article. Did we remove the correct card?


































Did we remove the correct card? See if you can figure out how before reading on.
 Did we remove the correct card? See if you can figure out how before reading on.
Actually, there's no such program. What you've just seen is a simple, but impressive missing card illusion similar to one that was supposedly created by David Copperfield. The illusion has been racing around in forwarded emails. With a little sleight of hand or a digital camera, you can perform this illusion live with real cards.

Steps

  1. 1
    Prepare two sets of cards.

    • One set should contain six cards. While you could use any six cards, the illusion is probably most convincing if you use three sequential cards (i.e. 5, 6, 7 as in the picture), and choose one red suit and one black suit for each number.
    • The second set should contain five cards chosen from the remaining two suits of each of the three numbered cards. Because there are only five cards, you'll have to leave out one black or red card of one number (the 7 of clubs in this example). It doesn't matter which one you leave out.
  2. 2
    Choose a friend or audience member.
  3. 3
    Lay out the set of six cards, face up, in front of the person. Induce a sense of ease and familiarity. These are just ordinary playing cards, after all. Show the person the back of the cards to show them that nothing is amiss.
  4. 4
    Ask the person to choose one card. Tell him not to touch the card, point to it, or tell you what it is.
  5. 5
    Pick up the cards and place them in a neat, face-down stack in your hand.
  6. 6
    Tell the person that you are going to try to read his or her mind to discover the card he or she has chosen. They must concentrate on it to the exclusion of all else, and remember the details thoroughly. Ask him to try to make a picture of it in his mind.
  7. 7
    Replace the first set of cards with the second. This trick is a little more difficult to perform in person than it is to display online, because you'll need to use some sleight of hand. As you're talking to your volunteer (and thus creating a distraction), switch the two sets of cards so that you hide the first one and now have the second set in your hand. This can be done in a number of ways, such as using a sleeve trick or putting your hand in your pocket (which has the second set of cards in it). Act like you're thinking very hard, and keep talking to the volunteer so he or she won't notice the switch. If you're no good with sleight of hand, see the alternate method below.
  8. 8
    Display the second set of cards. With much fanfare, lay out the five cards in the second set, one by one. The card the volunteer chose will have vanished! Actually, none of the cards are the same, but they resemble the cards from the first set so closely that the volunteer probably won't notice this.

How to Do Amazing Card Tricks

By thinknut.blogspot.com


Steps

  1. 1
    Hold a normal deck of cards in your hands (with one or two jokers in ).

  2. 2
    Memorize the bottom card.

  3. 3
    Ask an audience member to pick a card and place it on top.

  4. 4
    Cut the deck in half and place the bottom half on top. This puts the card you memorized ^ on top of their card. You can do as many cuts as you want, as long as they are single cuts.

  5. 5
    Pretend to look for jokers and take them out, but also find the card you memorized. Their card is resting on top of it. Cut the deck so their card is on top.

  6. 6
    Have them pick a number between ten and twenty.

  7. 7
    Deal that many cards off the top of the deck

  8. 8
    Take that amount of cards and hold them between your thumb and pointer, have them slap the cards and the one farthest to the left should be their card. Make sure you hold that one tight so it doesn't fall out.

  9. 9
    There is a similar trick to this. You will need a deck with two Jokers in it. Before the trick has begun, find both the Jokers and place one on the top and one on the bottom of the deck. Now the trick is ready to perform! Have your contestant pick a card anywhere in the deck. Then ask him/her to, after they have memorized it, place it back on top of the deck. Then fan through the deck and ask the participant to tell you when to stop. When they say stop split the deck there (If this step is to confusing then what I mean to say is that you can just split the deck.) Now their card is between both Jokers. Ask Him/Her to wave their hand over the deck and say "Jokers find my card." Fan through the deck so that your participant can see what you're doing. Their card should be right in between the Jokers.

How to Take a Fingerprint with a Pencil ???

By thinknut.blogspot.com


 
If you want to take fingerprints of people, use this recipe. It's different then most! It's very easy.


You Will Need :

  • A number 2 pencil
  • Tape
  • Paper

Process :

With the pencil, scribble a square a little bigger then the thumbprint. You want to have it nice and dark. Rub your finger on the square until your whole thumbprint is covered in the lead. Make sure your thumb is covered in the lead. Put your finger on the tape until your print is on there. Stick the tape on the piece of white paper. You just took a fingerprint! 

How to hack a Digital TV Converter ???

By thinknut.blogspot.com


 
Learn how to mod/hack a DTV box to run on battery power! Now that the digital TV conversion is right around the corner, no one has put any thought into what happens to your old analog portable TV's since ALL of the DTV boxes are AC powered. What about camping? What about emergencies when you want to watch news/weather alerts and have NO power? Here's the solution.


You Will Need :


  • DTV box
  • Barrier Strip or some other type of screw connector
  • 12V Car Lighter Adapter  

OPTIONAL



  • 12V Rechargeable Sealed Lead Acid Battery

Process :

Remove the 5 small screws that hold the case top cover on. 

There is a 5-pin connector located between the power supply and the main board. Directly next to the connector on the power supply you will see two small jumpers. This is where to make the solder connections for the Positive (+) and Negative (-) wires. Use a multimeter to confirm this location with the unit plugged in and you should get a reading of 12VDC. I attached two wires (red (+) and black (-) about 4 inches long.



Using the barrier strip, mount it to the back of the case using two screws and nuts. I had to cut away the lower portion of the barrier strip to make room for mounting it vertically. Drill one more small hole to feed the red and black wires through. Attach the 12V Car Power Adapter and the new red and black wires to two of the barrier strip screws, one on top and one on the bottom with the barrier in between to protect the contacts.


Close up the case and plug in your new battery powered DTV box into a cigarette lighter or hook up the 12 volt battery to the remaining barrier strip screws. Make your A/V or Coax connections, hook up your antenna and you now have DTV for your portable TV's! 

How LDR Works ???

By thinknut.blogspot.com


 
     
     LDRs or Light Dependent Resistors are very useful especially in light/dark sensor circuits. Normally the resistance of an LDR is very high, sometimes as high as 1000 000 ohms, but when they are illuminated with light resistance drops dramatically.

OR

    An LDR is a component that has a resistance that changes with the light intensity that falls upon it. They have a resistance that falls with an increase in the light intensity falling upon the device.

Symbol :


Working :

The resistance of an LDR may typically have the following resistances.
Daylight   = 5000 ohms
Dark= 20000000 ohms

You can therefore see that there is a large variation between these figures. If you plotted this variation on a graph you would get something similar to that shown by the graph to the right.

The animation opposite shows that when the torch is turned on, the resistance of the LDR falls, allowing current to pass through it.

Circuit Wizard software has been used to display, the range of values of a ORP12, LDR . When a light level of 1000 lux (bright light) is directed towards it, the resistance is 400R (ohms). When a light level of 10 lux (very low light level) is directed towards it, the resistance has risen dramatically to 10.43M (10430000 ohms).
This is an example of a light sensor circuit :

When the light level is low the resistance of the LDR is high. This prevents current from flowing to the base of the transistors. Consequently the LED does not light. However, when light shines onto the LDR its resistance falls and current flows into the base of the first transistor and then the second transistor. The LED lights. The preset resistor can be turned up or down to increase or decrease resistance, in this way it can make the circuit more or less sensitive.

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