Recent Posts

21

EEVblog Specific / Re: EEVblog 1612 - Siglent SDS1000X HD 12 bit Oscilloscope Teardown

« Last post by H.O on Today at 10:43:05 am »

Hi Dave, my 1204X-HD has microphonic inputs.

Wow. Why the difference?

Perhaps they forgot to mount the capacitors in your unit.
Let them know and they'll happily ship you a couple that you can solder in place...

22

Projects, Designs, and Technical Stuff / Re: Build or buy? Multi-level vessel temperature logger

« Last post by BennoG on Today at 10:42:28 am »

what about a stainless steel hollow pipe and put the sensors inside, and the pot the whole thing.
1 side you can weld close and the other you put some pt1000 sensors in or even better some DS18B20 or so (then you have only 3 wires coming out of the tube)
then fill the whole thing up with some food-grade potting and you are done.

Benno

23

General Technical Chat / Re: What did you buy today? Post your latest purchase!

« Last post by McBryce on Today at 10:41:47 am »

A book for the coffee table...

https://www.elektor.de/products/tektronix-epic-oscilloscopes

McBryce.

24

Microcontrollers / Re: How to create custom bootloader in esp8266

« Last post by mianos on Today at 10:40:31 am »

ps, I hope I have not confused you. I mean the tasmota project is attestation that OTA does work on the ESP8266 and can work very well.
I have not looked at their OTA code.

Maybe start here: https://arduino-esp8266.readthedocs.io/en/latest/ota_updates/readme.html

25

General Technical Chat / Dumpster diving save VFD

« Last post by Miti on Today at 10:37:22 am »

Another dumpster diving save of some… gorgeous … 4x20 VFDs. I like VFDs a lot.
Now I have to find the perfect filter for it. And an application. 
Miti

26

Microcontrollers / Re: Divide clock by 3 on a ATF16V8B

« Last post by Boomchil on Today at 10:33:35 am »

Thank you all for your answers. I have a TL866II so programming it is not a problem, but reading your answers there doesn't seem to be any simple and reliable way to do it, so I've decided to source a dead Sega Master System 2 to get its VDP and use it as an external "divide by 3 only" module.

27

Test Equipment / Re: TinySA Ultra launched

« Last post by shapirus on Today at 10:32:24 am »

First, I think the TinySA is a fantastic project, so thanks very much for doing this!

Yeah that's for sure. Very good value for money: at this low cost you essentially get the functionality, even considering the limitations, that would otherwise require to spend at least an order of magnitude more money.

Besides the actual SA, you're getting a useful RF signal generator, so yeah, this is an amazing product. In addition, at least in my particular unit, the 10 MHz calibration output is very accurate: its actual frequency aligns with my GPSDO reference output to within ~0.3 Hz (~30 ppb), so it can also be used as a pretty decent frequency standard. I wouldn't refuse having a way to tune that to exactly 0.0 Hz, though, but oh well :)

28

Test Equipment / Firmware update 1.23 - GW Instek GPP-4323

« Last post by Fab6657 on Today at 10:30:30 am »

Hello,

Firmware 1.23 is available since few days. I was looking about changelog description but was not able to find any information.
Anyone know something about the changes in this new release for the GPP-4323?

Thank a lot

29

Projects, Designs, and Technical Stuff / Build or buy? Multi-level vessel temperature logger

« Last post by paulca on Today at 10:29:25 am »

"A stainless steel stick with some form of temp sensors distributed along it's length."

* Must be food grade
* Must be tolerant to T>=0<=105*C
* Must be tolerant to high concentrations of:  Chlorine, mild acids, mild bases, alcohol.
* Must be cleanable/sanitizable - ideally detachable and completely immersible.
* Accurate to 0.1C +/- a bit.

The circuitry for the logger I can cover myself I think.

What I'm curious about is....   has anyone seen a commercial product like this anywhere?

Also, if I am to make it what is the best sensor type to go for?  Using "foil" or wire tip thermocouples isn't going to be very durable.  (Thinking of cleaning and storing, think kitchen, not lab).

If I was to make a crude as hell prototype, just to give you the idea, I could take 6 standard curve "stainless steal kitchen thermocouple probes" and lash them to a stainless steal rod at various heights.  Then connect all 6 to the logger board.

While this would work.  It would be difficult to clean with the lashings, handles and cables for bacteria to live.

30

General Technical Chat / Re: Cable Management

« Last post by EPAIII on Today at 10:28:26 am »

And there are commercial cable hanging brackets:

https://www.pomonaelectronics.com/products/dmm-test-leads-and-probes/test-lead-holders

Of course you could roll your own with a board and some wood dowels.