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<p>It really depends on what you want. A lot of time I do what you
do and that is just through a circuit into LTSpice and see what it
does verses sit down and figure out the math. Also you understand
the fact that this is a simulation and might or might not give
accurate results. Lots of noobs go 'I simulated something and the
circuit worked but the implementation doesn't' and wonder why.<br>
</p>
<p>I did contract HW/SW and one of the places I worked there were
senior EEs doing Spice simulations of circuits going from 5 to 30
GHz. These were real simulations actually writing Spice code to
get things close to being functional before prototyping. That was
beyond rocket science for me.</p>
<p>Jay S.<br>
</p>
<div class="moz-cite-prefix">On 5/16/2024 1:29 PM, Tom Wiltshire
wrote:<br>
</div>
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cite="mid:3B9C6FB4-1460-4C6B-B10B-69A1CACC923C@electricdruid.net">
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Maybe I'm a newb, but I don't agree about "more than likely add
your own models". There's a lot of useful stuff you can do in
LTspice without going near making your own models.
<div class=""><br class="">
</div>
<div class="">Perhaps we're just working towards different
objectives? Mostly I use it for testing ideas instead of
breadboarding, generating frequency responses for networks that
would be a pain to work out manually, checking filter responses,
that sort of stuff.</div>
<div class=""><br class="">
</div>
<div class="">I definitely don't think it's going to give me a
perfect answer - the first time I got the ideal op-amp model to
spin out to a 15KV output voltage firmly dissuaded me of that,
and that's surprisingly easy to do. The concept of "op-amps with
no supply rails" is pretty weird, if you're coming from a more
practical background - and since it clearly leads to behaviour
which is far from realistic, I did wonder a bit why they
included them at all. Now I'm better at it, I know when I can
use the basic models because it doesn't matter and when I need
something that actually has a rail limit. So yes, I totally
agree that you need some understanding of what the thing is
doing and what you're looking at - but 15KV output is a
give-away to *anyone*, right, newb or not?!?</div>
<div class="">
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<div><br class="">
<blockquote type="cite" class="">
<div class="">On 16 May 2024, at 19:58, Jay Schwichtenberg
via Synth-diy <<a href="mailto:synth-diy@synth-diy.org"
class="moz-txt-link-freetext" moz-do-not-send="true">synth-diy@synth-diy.org</a>>
wrote:</div>
<br class="Apple-interchange-newline">
<div class="">
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content="text/html; charset=UTF-8" class="">
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<p class="">I wouldn't recommend noobs using simulation
without them having some understanding of it. Main
reason without knowing how it works they assume that a
simulation is going to give you the perfect answer or
close to it.<br class="">
</p>
<p class="">To get good simulations you really need to
know what you are doing and more than likely make your
own models. A lot of the models for components are
simple and don't go into the details of the
components. So that can make a big difference in the
simulation.</p>
<p class="">There are things like noise, power supply
ripple, transmission lines, PCB layout ... that you
have to manually add to get really good simulations
that they have no idea how to do.</p>
<p class="">Jay S.</p>
<p class=""><br class="">
</p>
<div class="moz-cite-prefix">On 5/16/2024 11:21 AM,
Paulo Constantino via Synth-diy wrote:<br class="">
</div>
<blockquote type="cite"
cite="mid:CAFBByKV3p5KD+AxFvd7X2jgAOA1eoNvOrVRCXTQM=QJhS9PQ0g@mail.gmail.com"
class="">
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content="text/html; charset=UTF-8" class="">
<div dir="ltr" class="">
<div class="gmail_default"
style="font-family:monospace,monospace;font-size:small;color:#0b5394">What
about the Falstad simulator? It's the best for
quick and dirty sims!!!!!!!</div>
</div>
<br class="">
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Thu, May 16,
2024 at 7:11 PM Chris McDowell via Synth-diy <<a
href="mailto:synth-diy@synth-diy.org"
moz-do-not-send="true"
class="moz-txt-link-freetext">synth-diy@synth-diy.org</a>>
wrote:<br class="">
</div>
<blockquote class="gmail_quote"
style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div dir="auto" class="">Simulation, yeah! I learn
a ton from popping stuff into LTSpice and try
out anything new or novel there first. <br
id="m_4732428870818493596lineBreakAtBeginningOfSignature" class="">
<div dir="ltr" class="">Cheers,
<div class="">Chris </div>
</div>
<div dir="ltr" class=""><br class="">
<blockquote type="cite" class="">On May 16,
2024, at 8:21 AM, ben gebhardt via Synth-diy
<<a href="mailto:synth-diy@synth-diy.org"
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">synth-diy@synth-diy.org</a>>
wrote:<br class="">
<br class="">
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<div dir="ltr" class="">
<div
style="font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;font-size:13px"
class="">
<div dir="ltr" class="">Not sure if
mentioned already, but I learn alot by
simulating circuits and then doing time
and frequency domain analysis. </div>
</div>
</div>
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<br class="">
<blockquote type="cite"
cite="mid:CAFBByKV3p5KD+AxFvd7X2jgAOA1eoNvOrVRCXTQM=QJhS9PQ0g@mail.gmail.com"
class="">
<div class="gmail_quote">
<blockquote class="gmail_quote"
style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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<div
style="font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;font-size:13px"
class="">
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