Boreus

modified 6 years ago

Cannot find solution

202

04:27:32

Simple astable multivibrator. When the square wave is formed I switch to LED and it says "Cannot find solution". Why?

published 6 years ago

Molar

6 years ago

No idea. Placed 3 diodes in series before LED and it works. 2 wont get it..hmmm

PrathikP

6 years ago

There are some bugs... Hopefully the devs will fix it now that they are active

Boreus

6 years ago

Yes possible. If I placed 4 diodes in series before LED, it didn't work again. I use EveryCircuit often and I get this error message a lot of times, even for circuits that work perfectly when built. Very annoying.

Igor

6 years ago

@Boreus, a workaround is to add a capacitor in parallel with LED.

Igor

6 years ago

@PrathikP, circuit simulators in general struggle with sharp transitions for some circuits. EveryCircuit is no exception. Adding a small capacitance from problematic node to ground often helps, without affecting circuit behavior much.

Igor

6 years ago

Also a little hint - if you are like me and have no patience to wait for oscillation to build up, you can shake your phone (or quickly drag schematic back and forth in browser app). This injects current spikes into all circuit nodes, which kick-starts oscillation :)

Boreus

6 years ago

Is the problem caused by the steeply rising square voltage? Is there anyhing that developers can do to prevent such errors from occuring?

Igor

6 years ago

We already do quite a bit to improve simulation engine convergence, both in component models and in numerical methods, but there is obviously room for improvement.

2ctiby

6 years ago

http://everycircuit.com/circuit/6053726895472640 adjusted

2ctiby

6 years ago

http://everycircuit.com/circuit/6507825197744128 variation

2ctiby

6 years ago

http://everycircuit.com/circuit/5930724082057216 variation 2

digital_electronics

6 years ago

Thank you for sharing...👍

Boreus

6 years ago

This error message is very often. In this case the simulation is interrupted and users look for a circuit fault where they are not, instead of spending their time productively. All right, I'll place capacitors where needed. The app is awesome anyway. Thanks for the developers and keep up the great work!

2ctiby

6 years ago

http://everycircuit.com/circuit/4983933438263296 ... without any cap or diode or other LED alterations.... not very practical here though with very high wasted current.

Molar

6 years ago

I have a question guys. When a circuit link is posted, how do I view it within the app on an iPhone. I’ve found myself having to write down the long number and then go to safari and type it in. Very tedious and was wondering if there was an easier way. Thanks.

Igor

6 years ago

@Molar, unfortunately, the only alternative is to enter the circuit id into the search field in the iPhone app. I understand that this is still very inconvenient. Hopefully we can make it easier in the future.

Molar

6 years ago

It’s no problem, Igor! I appreciate your response. Love the app!

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