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I HAVE A DIGITAL BLOOD PRESSURE AND PULSE DETECTOR.ANY INFORMATION ON HOW SENSOR FOR THE PULSE AND AND BLOOD PRESSURE DETECTOR WORK?

I have heard a lot about electronic equipment operating under very wide voltage range e.g. 90 volts A.C 60 hertz to 270 VOLTS. When inquired I have been informed that it works by switched mode power supply unit. Can any body provide further informationon on switched mode supply.

I KNOW OF ELECTRONIC EQUIPMENT OPERATING UNDER WIDE VOLTAGE RANGE FROM 90 TO 270 VOLTS.AS PER PRELIMINARY INFORMATION BY SWITCH MODE POWER SUPPLY. CAN ANY BODY PROVIDE ME INFORMATION ON ITS WORIKNG AND DESIGM ASPECTS.

IT IS REGRETTED THAT THERE IS A SMALL MISTAKE IN MY WRITING. IN FACT I NEED INFORMATION FOR ELECTRONIC EQUIPMENT OPERATING UNDER WIDE VARIABLE VOLTAGE RANGE FROM 90 VOLTS A.C. TO 270 VOLTS A.C.AT 50 OR 60 HERTZ

I have heard a lot about electronic equipment operating under very wide voltage range e.g. 90 volts A.C 60 hertz to 270 hertz. When inquired I have been informed that it works on principle of switch mode power supply. Can any body provide further information.

I AM INTERESTED IN STUDYING A SHORT COURSE ON PLC PROGRAMMING FOR MOTOR CONTROL CENTER,BUS TRANSFER PANELetc.. CAN ANY ONE INFORM ME THE NAME OF THE INSTITUTION OR COMPANY OFFERING the course?