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Old 17th March 2012, 03:45 AM   #11
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Quote:
Originally Posted by compumike View Post
Hi Bob, One of the developers of CircuitLab here. Thanks for the link!
My pleasure, Mike. I also blogged you on the Bay Area Audiophile site (I'll PM a link to you).

Great job!

Bob
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Old 17th March 2012, 05:24 PM   #12
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Cool 3rd Party Models

Thinking about CBDB's suggestion for 3rd party models. Maybe there is a way, if the CircuitLab guys are willing, to do some kind of Wiki approach to the model library.

Let's say I want to use an opamp that isn't in the list. I go find the datasheet and put the specs for the desired opamp in the model specs. I rename it to the new opamp and save it. That's all there in CircuitLab now, but I think the new component stuck in my model.

Step one would be to identify newly created component models in people's circuits and make them available in the library, maybe in a different color so that people would know that it was a user created component and should be checked.

Step two might be to see if there was more complete model information that could be used in CircuitLab . The simulation does a lot right now, but there does seem to be a gap between the component descriptions in CircuitLab and Spice. I'm not sure what is possible here.

Anyway, what is already there is great. Like CBDB, more components would be great, but then more is usually a good thing. Thanks again.
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Old 17th March 2012, 10:09 PM   #13
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lehmanhill, as far as your frequency domain question, it really depends on your exact circuit. Some device models like the linear voltage regulators don't have any modeling of the coupling between input and output (so long as you're above the dropout voltage!). And for AC-to-DC circuits, like a diode rectifier, the DC operating point won't reflect the "charged" or "periodic steady state" condition of the system, so that wouldn't show you a true measure of power supply noise rejection. But if you're trying to model an input DC source, maybe a diode / inductor / resistor / capacitor bit of input filtering, then yes, you'd be able to learn something about noise rejection by using the frequency domain simulation for small AC signal noise rejection. Post a link to your circuit so we can see!

Deleting a selected element can be accomplished quickly via the delete key on your keyboard. Right-click menus may come in a later version.

untangle -- thanks for the blog post!

As far as third party models, shareable parts, etc: yes, we know we have to find a good way to let users share these part models. Having the components not be "stuck in my model" is certainly an important feature that we need to get right. For now, there is a copy+paste option -- you can open someone else's circuit with a saved custom op-amp or BJT, and copy and paste it into your own. (What kinds of SPICE model features are we missing that are most important to you?)

In the short term, if you have specific audio-related part numbers you'd like to see, let us know on our site -- someone posted this list of "universally favoured BJTs for analog DIY audio amplifier projects", and we're looking into adding them shortly.

Thanks all!
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Old 17th March 2012, 10:33 PM   #14
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Default Voltage Regulator to try Frequency Domain

As Compumike requested, here is my CircuitLab link. This is a variation of a voltage regulator used by Jos van Eijndhoven in this Relaixed2 balanced preamp. I'll post a build report on that when I get a chassis built, but for now, this was a great use of CircuitLab. I was trying some ideas using Jos' circuit as a starting point. The ability to model it and to share it with him through the internet was great. More than that, he could modify it, either to show me where I went wrong or to try something new.

As for the simulation, try the Frequency Domain simulation. As Compumike says in an earlier post, the noise rejection capability is very useful, as long as your are careful.

Click the image to open in full size.
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Old 17th March 2012, 10:35 PM   #15
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Default Circuit Link

Just playing here. When I used the BBS link above, it gave me the schematic. This time, I will try to post the link that would let you play with the simulation. Fingers crossed.

https://www.circuitlab.com/circuit/t...s-reg-variant/
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Old 17th March 2012, 11:09 PM   #16
Pano is online now Pano  United States
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Yep, that worked and was very fast! Cool.

FYI, I ran it in the Opera browser with no problem.
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Old 18th March 2012, 12:59 AM   #17
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/me guesses the "https" usage heavily loads the circuitlab's server, and isn't required, especially for embedded shared images...
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Old 8th September 2012, 07:44 AM   #18
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Default DoCircuits

Folks, I am one of the developers of www.DoCircuits.com We are also trying to create an online web based circuit simulation on the cloud - and modeling real devices and components. Its still early - and we have a load of components to add, etc. I will be very grateful if some of you can give it a spin and give your comments.
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Old 10th September 2012, 05:09 PM   #19
Krisfr is offline Krisfr  United States
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Quote:
Originally Posted by dbagchi View Post
Folks, I am one of the developers of www.DoCircuits.com We are also trying to create an online web based circuit simulation on the cloud - and modeling real devices and components. Its still early - and we have a load of components to add, etc. I will be very grateful if some of you can give it a spin and give your comments.
I wish you could put your build on the frontend of LTSpice. Nice work...

What will be the price when it is done?
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Old 10th September 2012, 07:17 PM   #20
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Default DoCircuits.com

Thanks ! The only issue is that LPSpice is proprietary - we would have to go and talk to Linear technologies. NGSpice would be much easier since its Open source. We plan to keep a basic version of simulation free and charge for an offline model - like on the PC / Ipad, etc.
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