Stabilized power supply, 40 volts 1,2 amps. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Stabilized power supply, 40 volts 1,2 amps. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Power Supplies

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This power supply (Fig. 3.1) was used to power an amateur AF power amplifier and has good parameters: output voltage 40 V, load current 1,2 A, stabilization factor> 100.

(click to enlarge)

Author: Semyan A.P.

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Wheelchair control with the mind 11.03.2016

Researchers at the Duke University School of Medicine (USA) have developed a device to control the movement of a wheelchair using only mental commands and have successfully tested it on monkeys.

To date, several scientific groups in the world have developed brain-machine interfaces to control prostheses using the activity of neurons in the cerebral cortex. However, it remained unclear whether this method could be used to control a wheelchair as it moved continuously through space.

Biologists from Duke University began experiments that could answer this question back in 2012. They injected two rhesus monkeys with hundreds of tiny microfibers in the cortex, responsible for movement and sensation. Then, placing the monkeys in wheelchairs, the researchers showed them bunches of grapes, forcing the monkeys to strive for the desired goal. The macaques did not move, so the drive was purely mental. The researchers recorded the resulting signals from nearly 300 brain neurons. Having accumulated a vast array of data, they programmed a computer system - a decoder - to translate brain signals into digital commands to control a special robotic wheelchair.

At the next stage, the monkeys tried to reach the goal by mentally controlling the wheelchair. They showed good learning ability, over time greatly improved their ability to navigate and got to the treat more and more efficiently and quickly.

Thus, the experimenters were able to prove that the activity of the cerebral cortex can be used to control the movement of a wheelchair and the brain can be taught this.

Interestingly, along with the brain signals responsible for various types of movement, the researchers unexpectedly identified a signal corresponding to an estimate of the distance to the target, which was not present at the beginning of the experiment. It came about during the course of study.

This work is of great importance for people with severe disabilities who have lost mobility and muscle control due to illness. Such technology can restore mobility to them.

Since the equipment can control up to 2000 neurons, the researchers plan to scale up the experiment to improve the fidelity and accuracy of the monkey device before moving on to developing a human version.

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