Recent Posts

1

Repair / Re: Roland E-35 keyboard with temporary noise/hum

« Last post by marcinado on Today at 06:59:18 am »

Here are additional infos and some pictures with schematic diagrams and photos of the instrument boards.

The instrument has weird volume control circuit - the slider adjusts the sound level right after the DAC system, before the input to the power amplifiers. This would suggest that the problem is somewhere on the Power Supply & Amplifier Board.

Interestingly, even when the volume slider is set to minimum where the sounds generated by the instrument cannot be heard, the hum I described can be heard. Also, when the volume slider is at minimum and you start playing on the instrument then various noises can be heard on the speakers.

I cannot localize the source of the problem the only solution in my mind is to replace all electrolytic capacitors. But is it possible that other components apart from capacitors have died and can cause the problem? Can you advise me what kind/producer of caps should I buy with long life?

2

Beginners / Re: Has anyone been successful selling products?

« Last post by fourfathom on Today at 06:55:11 am »

You've got to go niche or go big. Unless you have massive financing and a killer design that can't be easily duplicated, and customers, stick with niche.

3

General Technical Chat / Re: Does anyone make good SSDs any more?

« Last post by voltsandjolts on Today at 06:51:23 am »

You started this thread 8 months ago.
What did you buy in the end?
Or are you still waiting for "the one"?

4

Buy/Sell/Wanted / Re: SALE (AU/NZ): Multicomp Pro MP710086 (Owon P4305 rebadge) at element14

« Last post by 5U4GB on Today at 06:45:47 am »

Is anyone else getting a redirection loop when they click on "Shop Now" on the sale page?

5

Test Equipment / Re: SCPI - get instantaneous channel reading DS1054Z

« Last post by RoGeorge on Today at 06:40:56 am »

The trace can only be in one place at a time, the correct view is the downloaded data.  The screen looks differently because it tries to emulate the optical remanence of a phosphorus screen, like it used to be in the analog oscilloscopes with a CRT instead of LCD.

:WAV:STAR 1100
:WAV:STOP 1200

That's even better than downloading all the 1200 samples then discarding. 

6

Microcontrollers / Re: Memory model for Microcontrollers

« Last post by IanB on Today at 06:37:18 am »

Hmm. I should clarify that AFAIK, this model originated in C (on the PDP11), or perhaps one of the C predecessors (Algol?  BCPL?   The Fortran compilers I used didn't have a stack.)  However, it's a pretty useful and workable memory model that is now used for many other languages as well.

I just recently saw someone making the argument that C has come to define the de facto standard ABI for pretty much all other programming languages. And that this is not a good thing.

7

Projects, Designs, and Technical Stuff / Re: Onsemi AR1335 CMOS image sensor pinout

« Last post by mister_jay on Today at 06:34:37 am »

Can't tell how many times I downloaded this exact document Got exited once I saw the footprint but got frustrated again once I saw (or not saw) the ball names... At this point, I also found a reference design with a symbol, but the symbol only matches the wire-bond version of the AR1335 and does not match ball name nor the number of pads (58 instead of 63 If I remember correctly).

8

Microcontrollers / Re: Memory model for Microcontrollers

« Last post by westfw on Today at 06:12:41 am »

The "memory model" of having text, data, bss, stack, and heap is a C language thing.

Hmm. I should clarify that AFAIK, this model originated in C (on the PDP11), or perhaps one of the C predecessors (Algol?  BCPL?   The Fortran compilers I used didn't have a stack.)  However, it's a pretty useful and workable memory model that is now used for many other languages as well.

9

Buy/Sell/Wanted / Re: SALE (AU/NZ): Multicomp Pro MP710086 (Owon P4305 rebadge) at element14

« Last post by EvgenyG on Today at 06:11:36 am »

TENMA (UNI-T) 25meg arb gen for $174. Are those any good? I am seeing mixed reviews.
https://au.element14.com/tenma/72-3555/function-arbitrary-wf-generator/dp/266718802

10

General Technical Chat / Where'd Mornsun go?

« Last post by liteyear on Today at 06:11:15 am »

Mornsun, sometime in the last few weeks, has disappeared from DigiKey, Mouser and Element14. What happened?

All previously valid URLs seem to 404, like this one:

https://www.digikey.com.au/en/products/detail/mornsun-america-llc/B1212S-1WR3/13968708

Now the manufacturer is not even listed on the distributor's sites. Does not seem country specific, and the Mornsun product pages still look intact:

https://www.mornsun-power.com/index/sitesearch/partlink/keyword/B1212S-1WR3.html

Eerie...