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How does a pre-amplified pH sensor work?
Consider a "pre-amplified" pH sensor such as https://www.omega.com/pptst/PHE9...   There is only a single BNC connection.  Does the RTD temperature compensation as well...
Tue. Sep 4, 2018 - 02:52 PM
Looking for some 'Freak to rebuild IAR application
Also posted in Off-Topic to get more eyes...   A customer of our board house needs a legacy app rebuilt.  About 10-year-old app, and obsolete components and similar...
Tue. Jul 24, 2018 - 02:56 PM
MicrochipDirect pre-programmed AVRs -- how to
We are assisting our board house with specifying the build for another of their customers.  Mega64 app that had pre-programmed from factory/distributor in the past.  As...
Fri. Jun 29, 2018 - 03:57 PM
Xmega -- How to detect USB
A design is going onto paper, with an Xmega384-C3.  It will not be USB powered as the Xplained is, so we didn't get any hints there.   The question is what is the usual/...
Fri. Jun 1, 2018 - 01:43 PM
C question -- init string without trailing null possible?
I seem to recall a discussion on this in the past, but cannot find it.   I want to put an array of structs into flash.  (but flash or EEPROM or SRAM shouldn't matter, I...
Wed. Sep 27, 2017 - 07:21 PM
How many "powerful" instructions?
My pdp8/e reference card, circa 1970   [attachments too big for wysiwyg apparently...]    
Sun. Mar 5, 2017 - 08:14 PM
Mega324PB tough to find - Split from Mega328PB thread
gchapman wrote:Mouser Electronics ordered some. That was in October.  Still not there:   Mouser Part #: 556-ATMEGA328PB-AU Mfr.'s Part #: ATMEGA328PB-AU...
Wed. Mar 1, 2017 - 04:46 PM
Math help--Hydrophone voltage output scale
A prototype app is using a hydrophone http://www.aquarianaudio.com/h1c...   The datasheet says under Specifications which is confusing to us...a uPa is less than a butterfly...
Thu. Feb 23, 2017 - 04:53 PM
Adding GPS tracking
A customer has requested that we add GPS tracking to the device, which is a commercial/consumer rental device.  Think "lojack" -- when not returned, or stolen, they want to...
Wed. Nov 30, 2016 - 02:09 PM
Replace venerable TI-36X Solar Calculator
After 30 years or so, I gave my TI-36X solar calculator a [too] hard drop and now I'm missing a few segments.  :(   From http://www.datamath.org/Sci/Mode... Texas...
Tue. Aug 16, 2016 - 02:59 PM
(1<<bitnumber) expression considered harmful
Apologies to Edgar Dijkstra: Go To Statement Considered Harmful   The below has been at least mentioned a few times on 'Freaks over the years...   (1<<bitnumber)...
Thu. Aug 11, 2016 - 07:55 PM
AA alkaline discharge curve @5mA
Can anyone point me to a typical discharge curve for a AA alkaline battery with a 5mA discharge rate?  A quick Google search only uncovered curves down to 50mA; all others...
Tue. Jul 5, 2016 - 02:56 PM