[sdiy] Becoming better at understanding difficult analog schematics

[Michael E Caloroso]

The rules of schematics are:

1) Do not take them for granted
2) They often contain intentional errors
3) Most are purposely mixed up
4) Some are incomplete (IE the Oberheim SEM polysynth schematics were never
complete)

2) and 3) are a form of protection to make it harder for counterfeiters to
copy a product.

This is not to construe that any of us here are counterfeiters, but it does
leave us scratching our heads when we clone a circuit from a schematic and
it doesn't work.

MC

On Sat, May 11, 2024 at 8:02 PM Pete Hartman via Synth-diy <
synth-diy at synth-diy.org> wrote:

>
>
> On Sat, May 11, 2024 at 6:45 PM Paulo Constantino via Synth-diy <
> synth-diy at synth-diy.org> wrote:
>
>>  can you yourself understand these "non-linear" schematics by just
>> looking at them if you have not seen that type of circuit before?
>>
>
> You poke at a key item here.  Many many synth schematics have subcircuits
> which are the same "type of circuit" (e.g. I can pretty easily recognize an
> expo converter).  This comes from having seen the circuit before, though.
> When I see a novel circuit block I have to fall back to basic principles or
> simulation to see how it behaves.  Experience helps with these as well.
> The only way to get that experience is to "just do it".  Most of my synth
> circuit experience has been in the course of building DIY stuff and then
> troubleshooting it, or buying/getting broken synths and trying to fix them.
>
> There are some excellent lectures by Dr Aaron Lanterman on youtube that
> cover a lot of the common "well known" subcircuits, those have been hugely
> helpful for me, even re-watching I will find something I had missed
> previously.
>
> Pete
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