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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for the ‘Hardware’ Category

Sam Knutson on Twitter: ““Every piece of equipment is shipped from the factory able to successfully complete n power cycles and you only find out n at n+1” Anonymous IBM Customer Engineer (CE)… 

Posted by jpluimers on 2019/10/18

[WayBackSam Knutson on Twitter: ““Every piece of equipment is shipped from the factory able to successfully complete n power cycles and you only find out n at n+1” Anonymous IBM Customer Engineer (CE)… .

I could not track down earlier versions of the image than 2005; see the images below.


[WayBack] flowcart troubleshooting komputer | superplayboy:


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Sony STR-DE205 Receiver – storing FM stations into memory

Posted by jpluimers on 2019/09/27

Somehow I misplaced the manuals of my Sony STR-DE205 receiver, including the Operating Instructions.

Sony still makes receivers

I did find [WayBack] Sony STR-DE205 – Manual – AM/FM Stereo Receiver – HiFi Engine which has a Service Manual. It has no operating instructions though.

Luckily, the STR-DE205 is very similar to the Sony STR-DE305, which I found using sony str de205 filetype:pdf operating instructions and having an Operating Instructions copy at [

In fact, all the pictures in that manual look remarkably similar to the STR-DE205, except for one: the remote control:

It has one extra button POWER, which the STR-DE205 lacks, which likely means the STR-DE305 can be powered on remotely (like my trusty Sony MHC-3000 mini set that is slightly older).

Anyway, programming is easy as long as you know you need to press one of the NUMERIC BUTTONS in step 5:

  1. Press TUNER.
    The last received station is tuned in.
  2. Tune in the station you want.
    If you are not familiar with how to tune in a station, see “Receiving Broadcasts” on the previous page.
  3. Press MEMORY.
    “MEMORY” appears for a few seconds.
    Do steps 4 and 5 before “MEMORY” goes out.
  4. Press SHIFT to select a character (A, B or C).
    Each time you press SHIFT, the letter “A”, “B” or “C” appears in the display.
    If “MEMORY” disappears, start again from step 3.
  5. While MEMORY is displayed, press the number you want to use (0 to 9).
  6. Repeat Steps 2 to 5 to preset other stations.

Getting the text out of the PDF was a bit of a pain, as even though it renders, DRM tried to prohibit copying.

Luckily there is a pdftohtml with a -nodrm feature in Poppler (software) – Wikipedia (unlike the Xpdf – Wikipedia it forked from that does not have this switch) which I got based on these links:

Some more images are below after some Sony STR-DE205 videos.


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Posted in Hardware, History, Power User | Leave a Comment »

Blast from the TomsHardware past – Stress Test: Power Supplies Under Full Load

Posted by jpluimers on 2019/09/16

Blast form the past, as I just found out I had archived the (moved) pages where the original link wasn’t:

We put PC power supplies from 300 to 850 watts under continuous load to see if they can satisfy the power appetite of potent Athlon and P4 systems. Are they efficient and stable? Click into the THG Laboratory to find out!

Sources: the “Stress Test: Power Supplies Under Full Load” series:

The original page was not archived (likely because they dislike WayBack), but linked from [WayBack] Using PC power supplies in things other than PCs which I linked to in Convert/adapt an old ATX Power Supply into a Bench Power Supply with (or without) 3D Printed Parts

Note that [] Data Collection And Live Upload refers to the – now gone – Inadequate and Deceptive Product Labeling : Comparison of 21 Power Supplies , which I found back as well:

In spite of the high end-user retail prices, our lab technicians were surprised by the test results. No fewer than 6 power supplies struggled under full load: 3 of the candidates simply went up in smoke, while the other 3 shut down prematurely. The “black sheep” among all the test participants was Maxtron, with the TOP-520P4. According to the manufacturer’s specifications, this power supply is represented to be capable of withstanding 520 watts – divided up over the corresponding voltage ranges. However, in our test, it ceased working at 446 watts. Completely dead!


Posted in Hardware, PC PSU, Power User, PSU | Leave a Comment »

(53) Introducing the “Lab in a Box” Concept – Patrick Titiano & Kevin Hilman, BayLibre – YouTube

Posted by jpluimers on 2019/08/13

Related: Introducing The “Lab in a Box” Concept (ELC-E-2017-Prague).pdf



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Posted in Development, Hardware, Hardware Development, Hardware Interfacing, Power User, Raspberry Pi, Software Development | Leave a Comment »

Basically, all Harman Kardon amplifiers (including subwoofers) show power supply issues after a few years

Posted by jpluimers on 2019/07/26

Experienced first hand myself, all my Harman Kardon amplifier equipment (including subwoofer) have shown power supply issues after about 2 years of use.

Signs are devices not powering up any more, giving only a limited amount of power (for instance a subwoofer only blinking the power led), or intermittent shutdown failure (more often when it is warmer than 22 degrees Celsius).

There are companies making a living of just these power repairs (for instance who git all my defective equipment to work again for about EUR 100 per device: [WayBack] Harman Kardon –

This is how you remove the power supplies:

The biggest issues are failing capacitors, and glue becoming conductive.

Related blog posts:

Some videos below the fold.


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