Just for fun

Vartech 3005 B power supply, in your browser Beta

Set the voltage and the current limit, switch the output on and connect a load. See the supply flip between constant voltage (CV) and constant current (CC), save an LED, light a lamp, charge a battery and short the output on purpose.

Vartech 3005 B product page Power supply finder Back to the playground
Beta, just for fun. This is a playful beta, for illustration only. It is not a training tool and not a substitute for the real instrument. The actual Vartech 3005 B can differ in appearance, display, button behaviour, ranges, timings and readings. Everything here is simulated, so do not use it to judge a real measurement. Always follow the instruction manual and your site safety procedure.
VARTECH 3005 B · 0-30 V · 0-5 A VA OUTPUT OFF: showing the settings CV CC VOLTAGECURRENT LIMIT OUTPUT - (black) GND + (red) Beta · just for fun

Drag, scroll or click the knobs (left half is down, right half is up). O switches the output on and off.

Try a scenario

One click sets up the supply and the load.

1Set the supply

Output

2Connect a load

3What the supply is doing

Green: voltage (0-30 V). Orange: current (0-5 A). Last 10 seconds.

4Simulator settings

Reset everything

How a bench power supply works

  • Constant voltage (CV): the supply holds the voltage you set and lets the load decide the current. This is the normal mode for most loads. Lower the resistance and the current goes up.
  • Constant current (CC): once the load would draw more than the current limit, the supply stops raising the current and lets the voltage fall instead. It protects the load and the supply. The CC lamp lights.
  • Always set the current limit first. Short the output, turn the current knob to the limit you want, then connect the load. That is the safest way to power an LED, a charger circuit or an unknown board. Try the "burn out an LED" scenario to see why.
  • Output on and off: the output can be switched off while you adjust the voltage, so you can pre-set it before connecting the load. In this simulator the display then shows the settings, and the measured values when the output is on.
  • Linear supply: the 3005 B is a transformer-based linear supply, which gives very low ripple and noise, with a spec of 10 mV rms or less in CV mode.
  • A lamp is not a resistor: a cold filament has a very low resistance, so it draws a surge until it warms up. Watch it ride the current limit, then settle into constant voltage.

This is a playful beta simulation. The loads are idealised models (a lamp with a thermal time constant, an LED with a fixed forward voltage, a battery with a small internal resistance) and the display and button behaviour of the real 3005 B are approximated. Never connect a supply to mains-referenced circuits or batteries you do not understand, and follow the instruction manual.

Want the real thing on your bench?

The Vartech 3005 B and the rest of the Vartech power supply range are supplied by CIE Instruments, authorised distributor for Vartech in India.

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