Voltage ramp

Voltage ramps are when a voltage changes steadily (linearly) over time. This can be obtained with a capacitor getting or giving a steady amount of current.

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Capacitor constant current voltage ramp diagram by Electronzap Electronzapdotcom
Capacitor constant current voltage ramp diagram by Electronzap Electronzapdotcom

I like LM334s like these for setting a small current (10mA or less). As an Amazon Associate I earn from qualifying purchases.

Basic properties



Nice looking larger value capacitor kit.

  • Voltage of a capacitor rises steadily over time (linear) when charged with a constant current and the voltage of a capacitor falls steadily when discharged at a steady current.
  • Capacitor being charged or discharged with a steady (constant) current.
  • 1 amp will charge/discharge a 1 farad capacitor 1 volt each second. – 0.001A (1mA) will charge/discharge a 0.001F (1,000µF) capacitor 1 volt each second.

Video

Rising voltage ramp circuit using LM334 current source sink and capacitor for quick videos 9

A constant 1mA of current charging a 1,000µF capacitor (which is a 1 millifarad capacitor), will gain a volt of charge every second.

Basic electronics circuit fragments and simple circuits 4 capacitors changing voltage based on capacitance and current diagram by electronzap electronzapdotcom
Basic electronics circuit fragments and simple circuits 4 capacitors changing voltage based on capacitance and current diagram by electronzap electronzapdotcom

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Other topics:

555 timer is an integrated circuit (IC). Being an IC, it has complex circuitry combined in a single package with external pins/terminals to connect to other circuitry. You can easily make all kinds of fun circuits with just a 555 timer and the components covered above, so I think it’s a good component to learn next.

Transistors will probably be the most challenging components to learn. Understanding them will help you understand all of electronics much better, and help you the most in being creative while designing your own circuits.

Other topics:

These pages are still being compiled.

Short videos with diagrams pages of circuits using capacitors.  Bistable and Schmitt trigger 555 don’t use a capacitor, but they help introduce the 555 component.


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