EEVblog #1190 - Mailbag Review Bonanza - Page 1
Forum section: electronics / general

author: EEVblog
author_rank: Unknown
timestamp: March 15, 2019, 10:32:03 pm
content: A look at three major products in this lengthy Mailbag.SPOILERS:LabJack T7-Pro Multifunction DAQ with WiFi, Ethernet, and USBhttps://labjack.com/products/t715:56 Balena Fin Raspberry Pi Compute module industrial computerhttps://www.balena.io/fin/29:29 Dodgy truck LED tailight assembly38:00 Joulescope: Precision DC Energy Analyzer KickstarterWith lengthy discussion on current measurement autoranging.https://www.kickstarter.com/projects/jetperch/joulescope-precision-dc-energy-analyzer

author: gir
author_rank: Contributor
timestamp: March 16, 2019, 03:11:27 am
content: Regarding the absence of a microSD card: At $WORK we had dozens of µsdcards in our custom monitoring system fail (the Pi is known for this). Offering only the more reliable eMMC storage is (imho) the correct way to go.

author: johnlsenchak
author_rank: Frequent Contributor
timestamp: March 16, 2019, 05:01:57 am
content: I thought the lab was flooded, I would have figured it would have been a swimming pool by the time you did this video LOL

author: highlanderIII
author_rank: Newbie
timestamp: March 16, 2019, 09:48:05 am
content: Dave, did you just pull the RF connector off the WiFi module of the LabJack (at 4:53) ?None of this new Wi-Fi rubbish, I'll use the DB25 connector!OK, coax connects to Y1, not to J1 (visible at 6:03).

author: pinchies
author_rank: Contributor
timestamp: March 16, 2019, 02:44:09 pm
content: That labjack? I was wondering where it was used.Coincidentally, I just saw one in the field today - in a quantum computer:https://youtu.be/6yaY4Fw-ovM?t=242Hope the lab is drying out Dave!

author: darik
author_rank: Regular Contributor
timestamp: March 16, 2019, 11:06:51 pm
content: Quote from: johnlsenchak on March 16, 2019, 05:01:57 amAt the very end he mentions that it's starting to hail outside....

author: nixfu
author_rank: Unknown
timestamp: March 16, 2019, 11:39:59 pm
content: Dave, I liked that you did long segments in this mailbag. It's nice to have a mailbag like that sometimes. I know you feel like you have to do the wham-bam-thank-you-mam style you often do because you are so backed up with mail. But personally I like this style.

author: chickenHeadKnob
author_rank: Super Contributor
timestamp: March 17, 2019, 12:04:54 am
content: Quote from: nixfu on March 16, 2019, 11:39:59 pmThe segment on the joule-scope would have been a decent show all by itself. Fast, good and information dense - well done Dave. It was obvious you have been thinking about the design issues involved with this type of instrument. I did wish to know which ADC is being used and if the onboard STM32f091 "inguard processor" ADC+DACs are utilized, but that is just nit-picking.

author: EEVblog
author_rank: Unknown
timestamp: March 17, 2019, 12:21:43 am
content: Quote from: nixfu on March 16, 2019, 11:39:59 pmThis longer rambling "real time first try" format is actually easier and quicker to produce than a more polished mini-review.

author: EEVblog
author_rank: Unknown
timestamp: March 17, 2019, 12:23:17 am
content: Quote from: chickenHeadKnob on March 17, 2019, 12:04:54 amI thought about splitting it out into a 2nd video but it wasn't polished enough for a standalone review IMO, it was just me rambling and doing a first time play around with it, so decided to keep it in the mailbag.

author: EEVblog
author_rank: Unknown
timestamp: March 17, 2019, 12:25:24 am
content: Quote from: darik on March 16, 2019, 11:06:51 pmThat's when I headed downstairs to film it and I came back to a flooded lab

author: splin
author_rank: Frequent Contributor
timestamp: March 17, 2019, 12:36:41 am
content: Quote from: chickenHeadKnob on March 17, 2019, 12:04:54 amADS7056 - U22 and U26. That Dave happened to show it in the Digikey listing was presumably just chance because it happens to be the cheapest 2MSPS+ 14 bit ADC, and presumably why it was selected for the Joulescope (but underclocked at 2MSPS for some reason).

author: cjurczak
author_rank: Contributor
timestamp: March 17, 2019, 04:02:11 am
content: Where can I doing those high resolution photos? Love to see close yours of the PCBs if possible!

author: EEVblog
author_rank: Unknown
timestamp: March 17, 2019, 08:28:14 am
content: Quote from: cjurczak on March 17, 2019, 04:02:11 amhttps://www.flickr.com/photos/eevblog/46486019735/in/dateposted-public/

author: cjurczak
author_rank: Contributor
timestamp: March 17, 2019, 12:27:57 pm
content: No bottom side?

author: artag
author_rank: Super Contributor
timestamp: March 19, 2019, 07:26:55 pm
content: Huge ++ for the phoenix connector on that Balena board. I really hate using power jacks or USB for permanently-assembled systems. I usually end up fitting some sort of expansion board to pick up the power input on 0.1" headers.I also didn't realise the compute module supported uPCI - that's a pretty unusual feature for a small, cheap(ish) board. Must remember that next time I need an embedded board with PCI.

author: gearshredder
author_rank: Contributor
timestamp: April 03, 2019, 04:05:08 pm
content: Dave, for the LED tail light, the supply goes up to 30V as a 24v Fiber Nickel Cadmium (20x1.2v) nominal pack will sit at a 30v float voltage. These FNC cells are used in rail passenger vehicles but have different grades for engine starting, UPS, and general purpose.A lead acid style should only reach about 28v or so.

author: CChin254
author_rank: Regular Contributor
timestamp: April 29, 2023, 10:45:46 pm
content: Here are the rest of the ICs used in the front end of the Jetperch Joulescope precision DC energy analyzer: