Brief charging capacitor voltage ramp circuit using LM334 current source

Capacitor voltage changes steadily when provided a steady current. This creates a straight line if you look at the voltage change on an oscilloscope. A steady voltage change is called a ramp.

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Diagram

Video below shows how I put this circuit together on a breadboard.

Simple charging capacitor voltage ramp using constant current source schematic diagram by electronzap electronzapdotcom
Simple charging capacitor voltage ramp using constant current source schematic diagram by electronzap electronzapdotcom
  • One farad (1F) capacitors will change their voltage by 1 volt each second that one amp of current flows. Those are very large values, so usually it is a fractional amount. For example, a 0.001F (1,000ยตF) capacitor with 0.001A (1mA) of current flowing, will also change voltage at a rate of 1V per second.

Video



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Quick 1000uF capacitor voltage ramp using LM334 set at 1mA circuit schematic to breadboard build

Updated video and diagram:

Simple charging capacitor voltage ramp using constant current source schematic diagram by electronzap electronzapdotcom
Simple charging capacitor voltage ramp using constant current source schematic diagram by electronzap electronzapdotcom

Capacitor charging voltage ramp circuit made with LM334 current source component with oscilloscope

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