Questions tagged [falstad]

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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, ...
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1 vote
2 answers
70 views

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 ...
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-1 votes
3 answers
61 views

simulation (in Falstad's app) of thyristor using transistors fails

I am trying to simulate thyristor behavior with transistors PNP and NPN but it fails (is it a bug of app?). When lower switch is open(and was never closed) and upper closed then current flows through &...
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  • 107
2 votes
1 answer
293 views

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 ...
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0 answers
41 views

Exporting scope values array in Java Circuit Simulator?

https://www.falstad.com/circuit/ In falstad simulator, I would like to export the array of the values taken by the current, while analysing it with the scope. Is it possible to do that ?
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1 answer
181 views

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 ...
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  • 157
3 votes
2 answers
417 views

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 ...
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0 votes
1 answer
199 views

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 ...
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-3 votes
2 answers
228 views

Falstad - a bug with mosfets?

I have a schematic in Falstad. It is almost symmetrical (the mosfets are connected by drains and "SWAP D/S" is enable in the second mosfet to be able to connect both). And this symmetrical ...
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0 votes
1 answer
68 views

I want to do make an and-gate but why do I get high when my swich is off?

I want to do make an and-gate but why do I get high when my swich is off?
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0 votes
1 answer
119 views

"Noise" in simulator

I have been working on a simple circuit which performs XOR operation. The problem is that I am seeing a noise-like graph when both inputs are set to 1 (5V) and I have been doing a research on what it ...
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0 votes
1 answer
139 views

BJT Differential Amplifier with active load Analysis

I completed the theoretical parts of DC and AC analysis. I want to test them with the simulator. Both DC and AC analysis failed. I killed DC sources in the AC analysis section and I short-circuited ...
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2 votes
2 answers
242 views

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 ...
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2 votes
1 answer
606 views

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 ...
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1 vote
1 answer
114 views

Diode letting voltage through in circuit simulator - bug or real?

I'm pretty new to electronics, and so I've been modelling my circuits in a Falstad's circuit simulator. I noticed something which I did not expect, and am curious - is this effect real, or is this a ...
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0 votes
1 answer
119 views

Beginner - Why do voltage/current behave this way

I was checking falstad and came around this resistor circuit which lost me completely : Knowing that input voltage is 5v and current is 17mA : 1- Why is the voltage 0 after the 200Ohm resistor ...
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1 vote
1 answer
883 views

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 ...
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  • 403
2 votes
2 answers
1k views

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 ...
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0 votes
1 answer
1k views

How to Plot X/Y in Java Circuit Simulator

Does anyone know how to select the Y variable when doing an X/Y Plot in Java Circuit Simulator? I tried many things and none have worked.
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  • 465
0 votes
1 answer
1k views

Kill Switch schematic

I want to make a kill-switch pedal with on/off LEDs for my guitar. I tested a simple schematic but every time I ground the circuit like the schematic i put below i get an error: voltage source/...
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1 vote
1 answer
2k views

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
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  • 119
1 vote
2 answers
2k views

Active Notch Filter Simulation

I need to build an Active twin- notch filter that will filter out 60Hz. I am following the schematic bellow: To test the schematic, I am simulating it on Falstad Circuit Simulator, but the 60Hz is ...
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  • 198
0 votes
2 answers
107 views

OP Amp - Finding currents [closed]

I am having some difficulty figuring out V_out. I know that it is going to be inverted because V+ = 0 and I know that V- ≠ 0. I don't really know how to go about finding the currents in the system to ...
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7 votes
4 answers
12k views

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 ...
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1 vote
2 answers
1k views

Why isn't this Elenco circuit working in Falstad's simulator?

I'm learning electronics engineering with the Elenco 130-in-1 kit, and I'm trying to get better at visualizing how these circuits are working by making them in the Falstad simulator, but the first one ...
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