Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [falstad]

32 questions
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Is there a more realistic circuit simulator than Falstad's?

In real life, the 100mA load in the circuit below will experience a brief, partial loss in current and and a drop in voltage when the 4A load is engaged but this simulator is too basic to show that. I very much like how it visually shows current…
Arewfawe Waefadffawe
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Is this component in falstad a tl431

I'm self studying electronics, I am now familiarizing myself with the tl431, which is pretty much a "variable zener" aparently. I was shown the following symbol. I would like to simulate some circuits with it on falsad, I found this component, that…
Joaquin Brandan
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Circuit simulates in Falstad but not in LTspice

I'm having trouble simulating what should be a simple circuit in LTspice. I am designing a simple PWM-regulated power supply, but I'm running into problems when I try to simulate it. When I simulate it in Falstad circuit simulator I get a result I…
Jzuken
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Piezo speaker equivalent for circuit simulator

I am using Falstad's circuit simulator to test a design of an Op-Amp based microphone-speaker system...kind of like a megaphone, but the speaker is going to be a piezo plate. Falstad does not have a speaker or piezo speaker component I can add. …
traisjames
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1 answer

Finding Ve for a 3 input AND gate TTL circuit for different logic combinations

I'm designing a circuit that takes 3 24V input signals and pulls a 50 ohm resistor to ground when all three signals are high. My main concern is the voltages across different pins of the transistors for different logic combinations. The circuit is…
Callum Rafferty
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Is there a way to approximate an optotriac in CircuitJS / Falstad?

Falstad does not have an optotriac part. I've opened a feature request issue on the CircuitJS GitHub to ask for one to be added, but is there a reasonable way to emulate an optotriac given the components and building blocks that are currently…
Polynomial
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How to simulate external voltage source in Falstad?

I am looking to simulate circuits on Falstad: http://www.falstad.com/circuit/circuitjs.html . One of the features on the website is the ability to add an external voltage source programmable with JavaScript (Can be found under the drop down toolbar…
Steven Underhill
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Hold-on-hold-off soft latch power switch circuit

I'm trying to make a "hold-on-hold-off" type soft latch switch circuit, but I'm having a little trouble. I've found tons of "press-on-hold-off" types, but I haven't been able to find a single example of a "hold-on" type anywhere. I found/have been…
MyFingerHertz
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Falstads circuit simulator : capacitors have initial voltage?

I started playing with Paul Falstad's circuit simulator applet to see if it would be useful for my intro physics students. However, I'm running into a quirk regarding capacitors which I don't really understand. Namely it appears that capacitors…
Semiclassical
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1 answer

Attempting an audio pre-amplifier circuit with falstad.com

I'm new to electronics and discovered the falstad.com simulator. I wanted to model this audio pre-amplifier circuit: So I went into falstad and drew this: My pre-amplifier circuit on falstad The output voltage is showing a flat line at about 6V. …
John
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How To Charge a Battery in Falstad Circuit?

I'd like to model the charging of a battery in Paul Falstad's Circuit simulator. But, i cannot find a battery component. Is there any way to do this? thx
johny why
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Falstad Schmitt trigger problem

In the given problem, I know that the answer should be (d), because it should act like a Schmitt trigger. But when I try to model this circuit in Flastad, I suddenly get that the answer (b) is right. Perhaps I miss something again. The op amp…
KrtekUser
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Falstad, Micro-Cap, LTspice

I've just started with Electronics and am enjoying the Falstad simulator for seeing how components work, current flows, etc; really great. I've become aware of Micro-Cap and was aware of LTspice as, potentially, more useful simulators. Is there any…
Allinthemind
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Falstad Circuit not running

I created this Falstad circuit that is supposed to run to toggle between the 3 circuits to power the LED. The top AND gate leads to a circuit that makes a strobe light effect. The second is supposed to dim the LED. The last one is supposed to light…
sebas pineda
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DC current through capacitor in Falstad

I am using the Falstad simulator. I do not understand why am I getting a DC current through a capacitor in simulation. This must be an error from the simulator. Please, let me know if I am sane, I don't get why there is current flowing.
JCSB
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