Up-Controlled Negative Voltage Converter

  
This circuit was used to produce a variable negative voltage for contrast control of an LCD displa
Up-Controlled Negative Voltage Converter - schematic

y. A 74F374 generates a square wave that is ac coupled to a rectifier and load. By using the uP clock and data from the processor bus, and properly timed load signal, the dc level generated can be controlled by the uP.




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