[sdiy] Resistor Networks....

[Eric Schlappi]

Also if you are worried about matching why stop at 1%? There are a few
different series of very affordable thin film 0.5% 50ppm or 25ppm resistors
available from Susumu, Yageo, etc. (around $0.02 a piece) on mouser.
 Some 0.1% aren't too pricey either.

I've only really seen or used resistor networks in digital designs.

On Sat, Aug 29, 2020 at 9:18 PM Brian Willoughby <brianw at audiobanshee.com>
wrote:

> Why not use SMD networks?
>
> I've used the following
>
> https://www.mouser.com/ProductDetail/774-746X101103JP
>
> https://www.mouser.com/ProductDetail/774-746X101472JP
>
> … in digital designs without any issues. Granted, these have a common pin,
> but if you check the manufacturer (CTS) data sheets and product family
> you'll see every variation of parallel and network configuration available.
> I've only used them for digital because my analog circuit layout never
> seemed to facilitate a network. I'm sure that an SMD network will work just
> as well as discrete SMD resistors in an analog circuit.
>
> Sounds like you're considering mixing the original through-hole resistor
> networks with modern SMD, and I wouldn't bother with that. Just use SMD
> resistor networks.
>
> Brian Willoughby
>
> p.s. Some digital designers don't like the resistor networks because they
> find them harder to lay out. I did not have that problem. I believe it's
> the folks who actually like using 0102 SMD that find the networks "too big"
> - but I have only used 0102 in one design and was told to never do that
> again for the sake of sanity (at least during prototype stages).
>
>
> On Aug 29, 2020, at 8:32 PM, Pete Hartman <pete.hartman at gmail.com> wrote:
> > I'm working on laying out a classic through hole module design with SMD
> parts.  The original uses a fair number of resistor networks, most of them
> just parallel resistors, not common bus versions.  The resistor networks
> are, well... huge by comparison.
> >
> > Unfortunately the original designer isn't around for me to ask for input.
> >
> > My *impression* based on how the networks are being used (often times
> for things like input resistors and a feedback resistor in a summing op amp
> config, just as one example) is that part of their purpose was to get parts
> that were well matched.  But that's not anything but a gut feeling.
> >
> > So I'm looking for seasoned opinions about whether there is any
> important reason to keep resistor networks, when I can sub in 1% SMD parts
> that will take up less space and be more flexible for placement.  Are the
> networks either 1) better matched even than 1% parts, or 2) have some other
> characteristic which I'm not thinking of that might be important?
> >
> > Thanks
> >
> > Pete
>
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