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by Aaron Brady.
Original Post: 09
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I’ve built a project as a proof of concept. It worked fine, and now I’m
retrospectively writing it up for my blog. Unfortunately, I can see
improvements I could make, so as I’m writing it up I’m kind-of changing it
(well, very changing it).
First off, I didn’t really start with a schematic, I used some basic diagrams I
found of an example circuit for a non-inverting amplifier. I didn’t use an
LM741, because I actually had a few LM348N’s lying around. I haven’t put that
in the schematic because it’s a little embarrassing to waste a quad op-amp on a
single channel design.
(Witness my profligate waste of a quad op-amp!)
These fancy 3.5mm connectors on the schematic aren’t the kind that I used -
I’ve put them in the schematic because the footprint was already in my KiCad
library and it would save me the job of adding a new parts library.
I was tempted to swap that 100K in R4 for a potentiometer, but now we’re into
the realm of fantasy: that’s a very different circuit than I actually built and
without building it an experimenting I’m not confident whether I should be
using a logarithmic or linear pot.
I’m probably going to finish this design off by actually laying out a PCB and -
because I can’t help myself - probably getting it made. When I do that, I might
bring R4 out on a two pin connector so that it can be swapped out with other
resistances or pots. That is something I actually have done on the real
design:
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