NTNUJAVA Virtual Physics Laboratory
Enjoy the fun of physics with simulations!
Backup site http://enjoy.phy.ntnu.edu.tw/ntnujava/

Misc => Physics related resources => Topic started by: Fu-Kwun Hwang on February 04, 2011, 09:22:44 am

Title: Circuit Builder/simulator (R/L/C+ voltage/current meter+ oscilloscope...etc)
Post by: Fu-Kwun Hwang on February 04, 2011, 09:22:44 am
The following is a circuit simulator. Click one of the element and drag into the circuit, then set properties for that element.



This applet can be used to build and analyse DC and ACelectrical circuits.

When the applet is loadeda default circuit is build. It is extracted from a text file that can be foundat "lists/default.txt". To load anotherbuild file, type its name and press the "Load"button. -*- If you want to see a text list of the elements currently on the screen, press the "List" button.

If you want tochange the size of the circuit grid, change the number of rows and columns andthen press the "Set grid" button. Beaware that all components on the screen will disappear.

The"Show ->" button is used to visualizearrows representing the chosen current direction.

Newcomponents for the circuit are entered by a "drag anddrop" method. Press the button of the component you want to add,hold the mouse button and release it on the position where you want to put thiscomponent. Any horizontal or vertical position between two black dots can betaken.

The following direction independent componentscan be added:

Resistor: its value (in Ohm) can be entered next to    the resistor button.
Capacitor: value entered in Farad.
Inductor: value entered in Henry.
Light bulb: characterised by voltage (in V) and power (in    W). The color varies from black (no current) to white (maximum    current).
Wire: used to close    connections.
Switch: can be opened    and closed.

Some components need are polarised and thus have a positiveand a negative side. The direction can be set by choosing "+ down/right" or "+up/left" of the "Direction"list item. The following direction dependent components can be added:

Battery: value entered    in V.
General Voltage source:    its function prescription (in V) can be entered next to the source button    and it default value is "sin(t*2*pi*f)". Use "t" as time    variable, "f" as frequency variable and "p" as period    variable. The frequency can be entered in the text field below.
Current    Source: value entered    in A.
Oscilloscope:    simulation of a one-beam-oscilloscope. A window with the view on the    particular oscilloscope can be opened by selecting the "Display    Oscilloscope" option of the popup menu when you click the right mouse    button on the oscilloscope icon in the circuit.
Voltmeter: simulation    of a digital voltmeter. Use the "Display Voltmeter" option of the    right-mouse-button popup menu.
Ampe`remeter:    simulation of a digital ampe`remeter. Use the "Display    Ampe`remeter" option of the right-mouse-button popup menu.

The "Calculate" buttonis recalculating data. A number of "Step #"data points is calculated iteratively with a step size of "Step (s)". So the step size is entered in seconds(default is 1e-6 s).

The "Start/Pause"button and the "Reset" button are usedwhen a real time clock is necessary. This is in situations with slow varyingsources or the displaying of voltage or current graphs. The number of frames persecond = 1 / (10 * step size). This is real time up to step sizes of 0.01s.

You can move a component to another position by using"drag and drop". Other actions are available as options of the popupmenu when you click the right mouse button on the oscilloscope icon in thecircuit. The possible options are only enabled if it is relevant:

Delete Component: deletes the    selected component.
Change Value: changes the    value or function of the selected component.
Display Value Knob: pops up a    little window with a scroll bar to change the value dynamically (linear    steps or logaritmic steps).
Display Frequency Knob: pops    up a little window with a scroll bar to change the frequency of an ac source    dynamically. This only works when the "f" variable is present in    the function prescription.
Show/hide Value or Function:    concerns the display on the circuit grid.
Set Label: gives a name to the    selected component.
Display Oscilloscope: pops up    the oscilloscope window of the selected oscilloscope.
Display Voltmeter: pops up the    digital voltmeter window of the selected voltmeter. The mode can be switched    between DC and AC (rms value).
Display Ampe`remeter: pops up    the digital ampe`remeter window of the selected ampe`remeter. The mode can    be switched between DC and AC (rms value).
Display Voltage Graph: pops up    a voltage graph of the selected component (use Start button).
Display Current Graph: pops up    a voltage graph of the selected component (use Start button).
Change Switch: changes the    status of the selected switch: open or closed.
Change Polarity: switches the    + and - signs of polarizable components.

Title: Re: Circuit Builder/simulator (R/L/C+ voltage/current meter+ oscilloscope...etc)
Post by: h on February 09, 2011, 05:49:45 pm
Is it possible for this to be downloaded too ?

Title: Re: How to download Circuit Builder/simulator
Post by: Fu-Kwun Hwang on February 09, 2011, 07:49:30 pm
Files for circuitsimulator are packed into a zip file.
Just download the attached file and open circuitsimulator.html with your browser (or double click circuitsimulator.html).