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Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
I found this kool website for doing simulations. One of the applets has a visual way of seeing electroncs. you can add parts or scope channels to the simulation to change the outcome. They even have a class d amp if anybody want to see how they work. just select a circut and run your curser over circuit and see current and voltages and do a right click for the menue. you can add parts and wires move parts and wires. Anybody who knows spice wont have any problems.
Registered Member #2028
Joined: Mon Mar 16 2009, 08:13PM
Location: Norway
Posts: 319
Yeah, Falstads circuit simulator is really great, i use it a lot. They have recently updated the simulator too, with amongst others a simulated spark gap.
The nicest feature is that the simulation is dynamic, you can see what's going on and even alter your circuits while the simulator is running.
There are some disadvantaes though. When you reach into the >100kHz range it becomes impossible to retrieve any useful data because the scope function is too slow. Also, being a java app it is very slow and large simulations require a lot of processor power. And you cannot zoom, so the circuit size you can simulate is very limited unless you have a high screen resolution.
Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
thanks for the other links Myke, since Steve daybued his new coil I have been tying to find out what he did and have been studing different class D amplifiers and stumbled on Falstads. I Wonder if there is a feture for stating a simulation from scratch. I have been able to add components to change the simulation.
Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
teravolt wrote ... ...One of the applets has a visual way of seeing electronics.
Very nice indeed - I've seen it before.
Two things to keep in mind, regarding his illustration of electrical current by moving dots on the wire.
1) The dots move in the direction of conventional current, as if they were little -positive- charge carriers. That's fine with me. I think that beginners should start with conventional current. Practical batteries, lights, even commercial 3-phase AC power grids and utility tariffs were in place before the discovery of the electron (which turned out to have a negative charge).
2) The distance that the dots move is greatly exaggerated for clarity. In the opening example simulation (41 Hz damped oscillation starting at 50 mA), the peak-to-peak displacement of electrons in an AWG30 wire (D=0.25 mm) would be only 600 nanometers -- one wavelength of visible light.
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kool educational java applet simulators
