Growing knots. Effective trick and its solution

EFFECTIVE FOCUSES AND THEIR CLUES
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Growing knots. Focus secret

Spectacular tricks and their clues

Directory / Spectacular tricks and their clues

Focus Description:

Tie several knots on the rope in different places. Take the rope in your left hand so that it hangs freely, and with the fingers of your right hand, "rub" the upper knot. He disappears before the eyes of the audience. Then go to the second, third and other nodes, making them disappear as well.

Focus secret:

Knots that disappear from the rope are false. When tying the first such knot, step back from the left end of the rope by about one third of its length and make a small loop with a diameter of about three centimeters. Spectators should not be able to see where the rope crosses.

Focus Rubbing Knots

Now take the right end of the rope with your right hand and begin to pass it through the resulting loop as shown in the figure. Without waiting until the entire end of the rope is passed through the loop, push up with the middle finger of your left hand the part of the rope that is indicated by the arrow in the figure, and tighten the end more tightly.

You will get a false knot which will instantly disappear if rubbed between your fingers. In the same way, tie the remaining knots, distributing them approximately at an equal distance from each other.

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STSPIN233 - driver for low voltage BLDC motors 09.04.2018

STMicroelectronics has released a new STSPIN233 driver for building brushless DC (BLDC) motor control systems. The microcircuit contains the final power stage in the form of three independent MOSFET half-bridges with a driver, control logic and protection circuits.

The STSPIN233 provides 3 outputs from each half-bridge for connecting external current-sense shunts, making it easy to implement FOC without Hall sensors.

When off (standby), the chip consumes less than 80 nA, which allows you to increase the operating time of battery-powered devices.

Main technical parameters of STSPIN233:

open channel resistance of built-in MOSFETs Rds(on): 200 mΩ;
supply voltage range 1.8...10 V;
motor rated current up to 1.3 A;
maximum output current up to 2.0 A;
current consumption in standby mode - only 80 nA;
built-in complex of protections: by current (including from short circuit), by voltage, by temperature;
housing VFQFPN16 3x3 mm with a heat-conducting pad.

Target applications:

cash registers;
robotics;
portable printers;
low voltage actuators;
multicopters and drones;
personal medical devices.

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