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68 Threads found on Falstad
try a series resonance input and buffer with a DC biased emitter follower if
falstad's simulator is free, animated and interactive. By reducing the timestep you can use frequencies in the GHz. Its antenna model provides three simultaneous broadcasts on AM frequencies, which you can tune a detector to pick up individually. LTSpice is free and more sophisticated than falstad's. It contains models o
I'm watching your schematic run in falstad's. I guess S1 is the lefthand switch? As far as I can tell, it creates boost converter action. Here are some tips: The leftmost diode is unnecessary. I recommend that you add several scope traces. Look at Ampere waveforms through inductor, switch, righthand diode. Put 1k ohm resistors across diodes. T
Let's take Colpitts oscillator for example. How does the oscillations start? Imagine that we have simple LC circuit. We charge the capacitor with a battery and then disconnect the battery. When we disconnect the battery the oscillations will start. In colpitts oscillator, the tank circuit is always connected to +V. That's the thing that confus
falstad's AC source is ambiguous as to whether it is oriented upside-down or right side up. You can tell by looking closely at the color of its wires. The upper wire appears red (negative) in both your schematics. Therefore the op amp inputs are working properly in regard to inverting or not inverting. Most falstad icons do not indicate the
No, my circuit is constant voltage, not constant current. The input is listed as RMS so it might be a sinewave. The series resistor and input voltage establish the current. A Slight re-arrangement makes it a voltage controlled low side current
With a 4:1 ratio on amplitude, your drawing is not to scale. (120:30 mVpp) With a /5 counter divider you can make the frequency ratio precise. With 5V logic CMOS, you can easily mix the amplitudes down to your desired level with AC coupling as shown (HPF response ) Here is a quick
Does your Android device support Java? If so, then falstad's is an easy-to-use online simulator. It's animated and interactive. Mistakes are easy to spot and correct while the simulation is running.
Hey all, I'm having a real hard time designing a simple on / off switch for an AC audio signal using an N-channel JFET. I've got some schematics (which I haven't breadboarded out yet), but in trying to simulate these ideas in falstad, they never work. The circuit will run for a while and then quit, or occasionally i'll "reverse bias" the JFET, wh
I think Java based can work and some pretty good models can be simulated if you know the transfer function. Analog Circuit Simulator Applet is available in javascript or wrote the js
If you plan 50 Hz frequency, then a 4H primary inductance is reasonable. That is the default value when I place a power transformer in the simulator (falstad's). However as post #2 states, you can make the frequency faster, allowing you to reduce certain parameters for the transformer. [
A free program recommended often here is LTSpice. (Not sure how many parameters you can change in the semiconductor models.) Also see (although the semiconductor models are simplified):
1st cap controls the Q or peaking at LPF breakpoint, smaller increases boost from 7.5dB, bigger flattens it. 2nd and 3rd cap work together as 2nd order LPF, 1st cap also increases rolloff to 3rd order or 18dB per octave. Same in Q or Op Amp, but Op Amp is lower Z out.121584 If you want simulation text for falstad, let me
switching power converter Are you describing a switched-coil converter? See the thread below. Three basic types are discussed: buck, boost, buck-boost. In my posts are links to tutorial simulations. These are interactive and animated, using falstad's Java applet. (Your computer needs to have Java installed.) https://www.edaboar
I dont think the Wiki design will work. The difference is polarity and phase shift and the Hartley drives the tapped inductor and feedback one leg with the non inverting
LTspice is recommended by several at this forum. It's free. It supports many IC's made by Linear Technology. falstad's simulator is not Spice family, but it's free and easy to use. Its IC's are basic types... logic gates, op amps, PLL, 555, 4017, flip flops.
Something like many other sites or examples 7 seg. decoder voltage current
Brad can also post link to his graph for his demo
falstad's animated simulator supports a tunnel diode, with these circuits in the menu: * I/V curve * LC oscillator * Relaxation oscillator Free to download and use. Or, run it online and choose from the listed circuits. Look in the menu for Misc. Devices > tunnel diode. You need to have Java installed on your compute