[sdiy] Minimoog tuning woes, Op-amp swaps?

[dancemachine]

sounds like my engineering education, i used spice but had no idea
what the hell was going on.  only now close to 10 years later am I
starting to understand circuit topology and what does what...



On Wed, Feb 2, 2011 at 5:16 PM, Neil Johnson
<neil.johnson97 at ntlworld.com> wrote:
>
> On 2 Feb 2011, at 21:23, David G. Dixon wrote:
>
>>> I don't know about the Minimoog in particular, but I have had students
>>> working on projects who ran into problems when they replaced a 741 with a
>>> "better" op amp
>>
>> In that case, I say get the little darlings to run a SPICE model to figure
>> out the exact nature of the difference, so that they can make a more
>> informed choice.
>
> Please don't.  Instead, teach them about the requirements for op-amp
> stability, about phase margin, how to make op-amps circuits stable under
> various circuit configurations, etc.  Spice will show you a rough
> approximation of how  circuit might behave, but it won't tell you *why*.
>  Once they understand the *why* and the *how* is it worth exposing them to
> the temptations of Spice.
>
> Ultimately Spice is a tool (and a very powerful one at that in the right
> hands) - but as with all tools if you don't understand the problem and what
> Spice can (and cannot) do, you just end up bashing the screw with the
> hammer.
>
> Cheers,
> Neil
> --
> http://www.njohnson.co.uk
>
>
>
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