Recent Posts

1

General Technical Chat / Re: Cable Management

« Last post by Halcyon on Today at 12:17:04 am »

Since I don't have a proper "lab" as such, the only storage space I have is at home.

I do have a dedicated storage/server room (which is essentially just a study converted into that purpose, so I can just close the door and not hear/see anything). Cables which aren't used frequently are in storage tubs or archive boxes in said room, each labelled neatly.

More frequently used cables (like USB, adapters etc...) are in those open electronics parts bins inside the wardrobe in my office.

Very frequently used cables are in the drawers next to where I work.

2

Microcontrollers / Re: SD Card reliability in SPI mode

« Last post by thm_w on Today at 12:11:59 am »

OP: what brand and model of microsd card? Where was it purchased from?

I've used in a similar manner and card lasted for years. Power was always on unless the device was turned off. Which sounds the same as your scenario, but, not completely clear how often you are turning the device off.

Are you writing to the same area or adding more data to an existing file?
Most of SD cards don't have wear leveling, so if you're always erasing/writing to the same sectors the SD will wear out pretty fast.
There're some embedded-friendly filesystems supporting wear leveling, like littlefs.

Fairly sure any recent major brand microSD cards would have wear leveling implemented: https://forums.sandisk.com/t/which-sandisk-cards-support-wear-leveling/34679/4
But good idea to use something like littlefs, unless OP wants to implement a battery or supercap to guarantee safe shutdown.

3

FPGA / Re: Help on translate schematics to Verilog.

« Last post by BrianHG on Yesterday at 11:50:43 pm »

https://www.eevblog.com/forum/projects/verilog-shift-register-question/msg5448701/#msg5448701

You may define a 'wire y' before my examples, or, change my 'assign' into a 'wire' as 'ataradov' illustrated above.

4

Repair / Re: Rigol DP712 Output Shorted; Fuse? / I Screwed Up

« Last post by zanfar on Yesterday at 11:48:25 pm »

I ordered the replacement parts, and I've been re-reading the posts here:

You connected the battery to PS which was switched off and all the possible current passed to this thyristor.

By this, do you mean that had I turned the PS on first, then connected the battery, I may not have blown the diode?

I'm not sure which order I operated, nor am I now sure of which order the video showed. I'm not planning on trying again, just curious and trying to understand.

5

Other Equipment & Products / Re: Any opinions on the Aixun T420D?

« Last post by Astray on Yesterday at 11:42:52 pm »

This is exactly what I was looking for! Any chance you could make it this a bit more detailed by highlighting changes you made in all photos and explaining why you did what did?

I would like to better understand the mechanism/circuitry used for the station that allows it to detect when the handle is attached to the stand makes the handle go into sleep mode.

Also I'm impressed you were able to get the device for so cheap. The cheapest I could find before aliexpress coupons was $210 for a T420 with single C245 handle.

Did you purchase a C115 handle version (T405) (which I saw for around $170 on the store you mentioned) and then bought a separate C245 handle?

6

Repair / Re: Simpson 260 series 6 repair

« Last post by flashthunder on Yesterday at 11:38:46 pm »

I am using a 50ua constant current source and injecting into the 50ua jack. I have checked the diodes (both good) and also disconnected the varistor. I have @260mv across the movement and I can change that voltage via the R2 potentiometer, however I just cannot seem to get full scale deflection with 50ua. At this point I am thinking that possibly the magnet has lost some of its magnetism as the meter will fully deflect, but only with 56-57ua.

7

Security / Re: Microsoft repackages apps with a telemetry .NET wrapper

« Last post by SiliconWizard on Yesterday at 11:37:05 pm »

8

FPGA / Re: Help on translate schematics to Verilog.

« Last post by ataradov on Yesterday at 11:21:37 pm »

Code: [Select]

wire out = ctrl ? ~in : 1'bz;
Keep in mind that in a likely scenario of an FPGA, this only works for I/O pins. There is no tri-state logic inside the fabric. For custom silicon it is possible to have tri-state logic, but it is not common.

Code: [Select]

wire out = ~((a & b) | (c & d));


9

PCB/EDA/CAD / Re: High current traces meeting small component legs

« Last post by Doctorandus_P on Yesterday at 11:20:16 pm »

Also, the pins of such IC's may be narrow, but they are also much thicker then the 35um of a "regular" PCB. High current PCB's often also have thicker copper.  And it also helps to have wide copper close to the pin. It helps as a heatsink, and this is commonly also used for power electronics that dissipate power (Linear voltage regulators, class A/B amplifiers, etc).

10

Test Equipment / Re: Siglent SDS3000X HD and upgraded SDS1000X HD

« Last post by KungFuJosh on Yesterday at 11:17:29 pm »

I just tried the new software released by Siglent sigscopelab.

But this software seem to require some work.

It needs a lot of work, but it's free (at least for now). I tried it with my SDS2504X+, and it worked pretty well, but putting the scope in 10 bit mode made it crazy.