A scarf that changes color. Effective trick and its solution

EFFECTIVE FOCUSES AND THEIR CLUES
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A scarf that changes color. Focus secret

Spectacular tricks and their clues

Directory / Spectacular tricks and their clues

Focus Description:

You pick up a red handkerchief, show it to the audience, run your hand over it, and the handkerchief instantly turns blue. Run your hand over it again - and the handkerchief is red again.

Props:

2 handkerchiefs: blue and red, a small metal ring.

Focus secret:

Fold the handkerchiefs on top of each other - blue on red. Sew them together in the center with a small seam.

Focus Scarf that changes color

Sew a small metal ring into the top corner. Its size depends on the size of the scarves. Scarves should pass freely through the ring.

Take the bottom end of the blue handkerchief and slip it into the ring. Be careful that the corner is not too loose in the ring, otherwise it may fall inward.

Fold the red handkerchief in half and sew another seam from top to bottom so that the blue handkerchief is not visible. Turn the scarf inside out to the blue side by pulling the end of the blue scarf out of the ring. Make the same seam as on the red scarf. Turn the scarf back to its original position, i.e. to the red side.

Show the red handkerchief to the audience. Take the ring with your right hand, and with your left - the tip of the blue handkerchief. Pull your left hand up and your right hand down, turning the scarf on the blue side. The red corner will remain in the right hand. Make sure the audience doesn't see it. Wave the blue handkerchief to the audience and repeat the trick from blue to red.

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ADS8688 - multi-channel SAR ADC for measuring bipolar signal 26.06.2015

The new ADS8688 SAR ADC from Texas Instruments will be of interest for use in industrial automation applications where it is necessary to measure a bipolar analog input signal with a unipolar (+5 V) system power supply.

The ADS8688 is a 16-bit, 8-channel successive approximation (SAR) ADC that provides signal measurement capability up to 500 ksa/s. The microcircuit is a full-fledged analog input path with protection of each input against 20 V overvoltage. The built-in 8-channel multiplexer allows you to implement measurements on each channel both in automatic and manual modes. With a supply voltage of 5 V, the microcircuit provides the ability to measure the input signal in the range: + -10,24 V, + -5,12 V, and + -2,56 V, or: 0 ... 10,24 V and 0.. .5,12 V per channel. The input range is set by programming the internal registers independently for each channel. In this case, regardless of the selected input range, an input resistance of 1 MΩ is provided.

The ADS8688 integrates all the nodes necessary for signal pre-processing: amplifier, reference voltage source, ADC. This ensures sufficient measurement accuracy, which is achieved due to a small gain error of 0.5% and a small drift value of the built-in reference voltage source. For those cases when it is necessary to obtain a temperature stability of the reference voltage source better than 10 ppm / C, it is possible to connect an external reference.

A wide range of supply voltages for the digital part of the ADC from 1,65 V to 5,25 V makes it possible to use it with various microcontrollers. To communicate with an external microcontroller, the ADC uses the SPI interface.

The microcircuit is made in a TSSOP package and is designed to operate in the temperature range from -40 to +125°C.

Key Features:

Transformation type: successive approximation (SAR);
Bit depth: 16-bit;
Number of input channels: 8;
Maximum input voltage range:
+-10,24V;
Supply voltage:
analog circuit power supply (AVdd) 4,75 V to 5 V;
digital circuit power supply (DVdd) from 1,65 V to AVdd;
Input impedance: 1 MΩ;
Possibility of serial connection - Daisy chain;
Input surge protection: 20 V;
Built-in ION: 4,096 V;
Built-in ION drift: 10ppm/C;
Operating temperature range: -40...125°C.

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