[sdiy] Need one of two things....

[Pete Hartman]

A bit of an extreme approach when troubleshooting a different circuit, but
sure :D

Pete

On Fri, Oct 30, 2020 at 9:10 PM Oren Leavitt <obl64 at ix.netcom.com> wrote:

>
> On 10/30/20 8:42 PM, Pete Hartman wrote:
>
> Thanks Neil!
>
> Currently trying to absorb it.... :)
>
> Pete
>
> Clone a PAiA Gnome - It'll give you a feel for how Norton op-amps work.
>
>
> On Fri, Oct 30, 2020 at 7:52 PM Neil Johnson <neil.johnson71 at gmail.com>
> wrote:
>
>> Hi Pete,
>>
>> TI's AN-72 is a pretty good read on how Norton op-amps work and many
>> applications, including all the "standard" circuit blocks:
>> https://www.ti.com/lit/pdf/snoa653
>>
>> Neil
>>
>> On Sat, 31 Oct 2020 at 00:09, Pete Hartman <pete.hartman at gmail.com>
>> wrote:
>> >
>> > 1) Is there anyone with experience or a pointer to a description of how
>> the Serge '73 R7 envelope generator works?  Basic googling gets me various
>> summaries of Ken Stone's page where "a little on how it works" is just the
>> schematic.  Got that, don't grok it in the slightest...
>> >
>> > ...Because I don't really "get" Norton Amplifiers.  (I have been able
>> to repair VCS' in the past but leaned very heavily on Tim Stinchcombe's
>> description of how it worked).  I mean yes, I understand logically "current
>> differencing" but in practical uses I can't look at a topology and say "oh
>> yes, this is an inverter/summer with gain X" the way I can with a standard
>> Op Amp.
>> >
>> > So
>> >
>> > 2) out of all of the various circuit simulation tools that have been
>> discussed, which one or ones has a decent Norton Amp simulation?
>> Simulation is usually my go to with circuits that don't follow "standard"
>> often used topologies (standard like an expo converter, or
>> integrator/differentiator, etc).  I'm one of those who has long leaned on
>> the Falstad javascript simulator, and they do NOT have a Norton Amp (at
>> least not as far as I could tell, no promises that I didn't miss something).
>> >
>> >
>> > I've got one of ZThee's 73-75 panels and none of the three EGs will
>> cycle in the usual way.  Power looks good, components have not been 100%
>> verified but everything I've checked directly against the circuit appears
>> to be correct.  Nothing is hot.  Soldering is solid (I resoldered a few
>> joints here and there, but mostly out of an abundance of caution).  None of
>> the usual first step troubleshooting methods has borne fruit so I'm now
>> into "ok I have to understand the circuit well enough to know what each bit
>> of it SHOULD be doing when I have end connected to start or cycle."
>> >
>> > Thanks!
>> >
>> > Pete
>> > _______________________________________________
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>>
>
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