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Voltage Converter Circuits
Designed by David A. Johnson, P.E.

Last Updated on: Monday, April 21, 2008 04:19 AM

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More Converter Circuits

DC to DC Power Supplies          Converters: Frequency to Voltage                Converters: Period to Voltage    
Converters: Sine to Square Wave                Converters: Voltage                 Converters: Voltage to Frequency 
High Voltage Power Supplies                Switchmode Power Supplies                 Voltage Controlled Oscillators


 

  • 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.

  • 0.5v to 6v Voltage Converter
    Conventional silicon transistors just can't operate at voltages less than about 0.7v. Old germanium transistors could be used, but those are hard to find these days and most are rather large in size. Some new n-channel MOSFET devices with very low gate-source threshold voltage can operate at quite low voltages. I've been experimenting with various devices and came up with one circuit, which demonstrates how to boost the low voltage from a single solar cell to a higher voltage.
 


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