Circuit - Swith Mode Power Supplies Converters Circuits / Schematic List - Circuits designed by David A. Johnson, P.E.

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Circuits designed by David Johnson, P.E.
Last Updated on: Wednesday, November 30, 2011 01:24 PM

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Switchmode Power Supplies

0.5V Negative Supply
Although not very efficient, this simple circuit, consisting of two LEDs and a photo diode, generates a negative voltage with a current level of a couple milliamps. It is ideal for supplying a negative rail to low power “rail to rail” op amp circuits, which need to have a true zero volts output.

CHARGE PUMP EFFICIENTLY DIVIDES SUPPLY VOLTAGE
This circuit uses a few FETs and logic devices to down convert a DC voltage to about one half its value

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