Recent Posts

1

Mechanical & Automation Engineering / Re: low temperature coolants?

« Last post by jpanhalt on Today at 09:14:05 am »

I am having viscosity problems with coolants. I tried IPA, a computer cooling fluid (coolance), and a mixture of 70:30 propylene glycol and water.


They all get rather viscous and do a number on my tubing.


What fluid can be used that stays the most liquid at low temperatures? I thought maybe methanol.

Water can be used at freezing temperatures.  I have also seen liquid helium used for somewhat lower temperatures.

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Buy/Sell/Wanted / Re: Canceled Because Thread All Shit Up by "tggzzz"

« Last post by shapirus on Today at 09:10:16 am »

I have nothing against the OP or his products, but he absolutely overreacted and that started the downward spiral more than anything else.

I think we observed a perfect example of what's called synergistic effect.

Or a well-matched resonant circuit, if you wish.

3

Projects, Designs, and Technical Stuff / Re: 100mA (or whatever) the easy way

« Last post by Terry Bites on Today at 09:07:30 am »

I make no claims to originality, for a fixed and upgradable source it's simple and handy.
It doesn't appear much in current source examples on the interwotzit

A MOSFET could be used but it will reduce the avaiable voltage compliance.
A bit more compliance can be squeezed out using a Sziklai pair instead of a Darlington.
Some of stability components don't go amiss.

4

FPGA / Re: Help on translate schematics to Verilog.

« Last post by caius on Today at 09:07:11 am »

I implemented the PLL and improved things.Now the sprites are almost perfect, there are only some little glitches (like sparkling pixels).Which are the parameters in PLL I can play with?Thaks again for the help.

5

Test Equipment / Re: Hacking the Rigol DHO800/900 Scope

« Last post by shapirus on Today at 09:04:54 am »

Hello all.  I tried the 100mhz/memory depth hack on firmware 1.02 and it initially failed with Key.data not found errors.
I edited the 2 batch files to RKey.data and it finds the files now but it says the key file format is wrong.

How do I get this hack to work on 1.02 firmware? Thanks!

https://www.eevblog.com/forum/testgear/hacking-the-rigol-dho800900-scope/msg5344076/#msg5344076

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Test Equipment / Re: $20 LCR ESR Transistor checker project

« Last post by madires on Today at 09:03:41 am »

The display output is hexadecimal with a colon. Looks like the programmer's software took the .eep file literally. Please reprogram the EEPROM and select Intel Hex format for the .eep file.

7

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

« Last post by Peter_O on Today at 09:01:03 am »

Some Wima MKP capacitors, back in the 1990s, when I was young, they were the most famous audiophile capacitors in China.

Here's some company history:
https://www.wima.de/en/wima-group/wima-company-history/

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

« Last post by gamalot on Today at 08:56:07 am »

Some Wima MKP capacitors, back in the 1990s, when I was young, they were the most famous audiophile capacitors in China.

9

Test Equipment / Re: Choosing between entry-level 12-bit DSOs

« Last post by tautech on Today at 08:55:27 am »

What's the problem with WiFi in the Siglent, exactly? It can operate as a USB host, right? Then, since it's Linux-based, it should be possible to build a kernel module for any particular WiFi chipset. What then? Lack of userspace software?

Or let's put it this way: has anyone ever attempted modding or at least looking into the scope's operating system?

WiFi is only currently supported in the 4ch X-E models using the TP Link TL-WN725N USB dongle which with a good WiFi access point provides many meters of connectivity plus NTP time and negates the need for a wired LAN connection.

The TL-WN725N dongle was supported with its specific driver within the X-E OS on day one release.
The 2ch SDS2000X-E range has this WiFi support also.

However the newer SDS800X HD models use a totally different OS that's based on the more upmarket models so incorporating into the new OS will be somewhat more of a challenge....which is why we have pleaded with Siglent to enable it.

10

Manufacturing & Assembly / Re: Metcal MX-5210 underwhelming performance

« Last post by palindrome on Today at 08:41:33 am »

Yes, I bought the station with multiple new tips from an official distributor and I tried all of them.