30 Mar
2026
30 Mar
'26
1:52 p.m.
sudo friends -
I have a couple of projects in mind that build on sensitive (microkelvin
resolution) electronic temperature measurement and recording.
I got some AdaFruit Ultra Thin 10K thermistors
https://www.adafruit.com/product/4890
To complete the picture, by scratch-building a delta-sigma ADC with an FPGA,
I have worked up a Mouser shopping list
10 595-OPA1662AIDR $1.52 TI OPA1662D dual op-amp in SOIC8 1.27 mm pitch
20 595-74LVC2G17DCKTE4 $1.29 TI SN74LVC2G17 dual 5V driver in SC70 0.65 mm pitch
10 863-NCP731ADNADJR2G $1.21 onsemi NCP731 low-noise LDO in MSOP8 0.65 mm pitch
I pine for the days when everything came in a DIP package for easy protoboard use.
Now I will also need to scrounge up adapters, some of which I find on eBay.
Also a bunch of of passives.
If you (a) already know of stuff like this in sudo room or nearby, or
(b) have items you'd like to piggy-back on my Mouser order,
please let me know (here or DM).
Of course I'd love to share ideas and progress with y'all, on-line or especially
in-person.
I plan to come in Tuesday night this week, but have a conflict for
Wed (radio night).
- Larry
30 Mar
30 Mar
2:50 p.m.
we have (and i have) plenty of through-hole op-amps, as well as surface mount
ones. we also have lots of through-hole 74HC14 schmitt-trigger hex inverters,
and i think we have a bunch of through-hole 3v3 regulators (and definitely 5v
7805s)
if you're in on tuesday i'll help you find things
On Mon, 30 Mar 2026, Larry Doolittle via sudo-discuss wrote:
sudo friends -
I have a couple of projects in mind that build on sensitive (microkelvin
resolution) electronic temperature measurement and recording.
I got some AdaFruit Ultra Thin 10K thermistors
https://www.adafruit.com/product/4890
To complete the picture, by scratch-building a delta-sigma ADC with an FPGA,
I have worked up a Mouser shopping list
10 595-OPA1662AIDR $1.52 TI OPA1662D dual op-amp in SOIC8 1.27 mm pitch
20 595-74LVC2G17DCKTE4 $1.29 TI SN74LVC2G17 dual 5V driver in SC70 0.65 mm pitch
10 863-NCP731ADNADJR2G $1.21 onsemi NCP731 low-noise LDO in MSOP8 0.65 mm pitch
I pine for the days when everything came in a DIP package for easy protoboard use.
Now I will also need to scrounge up adapters, some of which I find on eBay.
Also a bunch of of passives.
If you (a) already know of stuff like this in sudo room or nearby, or
(b) have items you'd like to piggy-back on my Mouser order,
please let me know (here or DM).
Of course I'd love to share ideas and progress with y'all, on-line or especially
in-person.
I plan to come in Tuesday night this week, but have a conflict for
Wed (radio night).
- Larry
_______________________________________________
sudo-discuss mailing list -- sudo-discuss(a)sudoroom.org
To unsubscribe send an email to sudo-discuss-leave(a)sudoroom.org
More options at https://sudoroom.org/lists/postorius/lists/sudo-discuss.sudoroom.org/
3:23 p.m.
Jake -
On Mon, Mar 30, 2026 at 02:50:41PM -0700, Jake wrote:
we have (and i have) plenty of through-hole op-amps,
as well as surface mount
ones.
Not surprising, and good, I can get started with those.
The OPA1662 has the noise performance I ultimately want.
we also have lots of through-hole 74HC14
schmitt-trigger hex inverters,
Also good for getting started; thanks!
and i think we have a bunch of through-hole 3v3
regulators (and definitely 5v
7805s)
Not surprising, and good, I can get started with those.
I'm actually looking for 5.5V, again with low noise.
if you're in on tuesday i'll help you find
things
I look forward to it! Are you also optimistic about SOIC-to-DIP
adapters for protoboarding?
Two weeks ago (?) I chatted with Ivan about finding a way to
better index what's in the room. More motivation!
> 10 595-OPA1662AIDR $1.52 TI OPA1662D
dual op-amp in SOIC8 1.27 mm pitch
> 20 595-74LVC2G17DCKTE4 $1.29 TI SN74LVC2G17 dual 5V driver in SC70 0.65 mm pitch
> 10 863-NCP731ADNADJR2G $1.21 onsemi NCP731 low-noise LDO in MSOP8 0.65 mm pitch
- Larry
3:41 p.m.
The OPA1662 has the noise performance I ultimately
want.
is this for something you're producing or for a workshop?
and i think we
have a bunch of through-hole 3v3 regulators (and definitely
5v 7805s)
Not surprising, and good, I can get started with those.
I'm actually looking for 5.5V, again with low noise. I look forward to it! Are you also optimistic about
SOIC-to-DIP adapters
for protoboarding?
I'm pretty sure we can find such things for SOIC if that's what you mean, if
it's more esoteric than that then let me know and i'll look in my stash at
home
Two weeks ago (?) I chatted with Ivan about finding a
way to
better index what's in the room. More motivation!
we need a workday of reducing bins from the shelves that don't need to be
there, and then we can make a system where the bins get a fixed location that
they always go back to. I already procured a set of colored tapes to mark the
rows and columns of locations, so that bins can always easily be put back
where they go (by people with color vision at least, we can also print a
row/column code of course)
Then we just need an online tracking system, like a web spreadsheet app...
-jake
54
days inactive
54
days old
3 comments
2 participants
participants (2)
-
Jake -
Larry Doolittle