Digest for sci.electronics.repair@googlegroups.com - 10 updates in 3 topics

9:40 AM Penedão
Wond <lost@the.ether.net>: Jun 30 03:09PM

On Mon, 28 Jun 2021 22:28:19 -0700, Phil Allison wrote:
 
> So don't use one.
 
> Regular mains power is gonna be fine.
 
> ..... Phil
 
My thinking too, but it appears from available bumf that inverter
types claim less THD than cheap conventional gens.
It would be interesting to see how Agilent/Keysight measure it in
their DMM. Thanks for reply.
bitrex <user@example.net>: Jun 29 06:51PM -0400

Replaced the LCD and backlight assembly in my old Emu ESI-4000 sampler:
 
<http://www.vintagesynth.com/emu/esi4000.php>
 
Which after 25 years even the LED back lighting was starting to get
annoyingly dim.
 
Replaced it with one of these white-on-black units which works fine
and looks pretty good:
 
<https://www.buydisplay.com/arduino-black-lcd-20x4-i2c-code-character-module-display-high-contrast>
 
Except that the software-adjustable contrast range, which was probably
optimal for a black-on-yellow display, can't bring the CV up enough to
avoid some "blockies" shining through. I'm wondering if there's a quick
hack to get some more range. Or maybe it would be better to put a
resistor in line with the backlight supply to reduce bleed-thru.
 
The "Turbo" board on these adds some of the nicest digital filters there
were in a hardware sampler of the era:
 
<https://www.youtube.com/watch?v=zEg60WzYco4>
Rheilly Phoull <rheilly@bigslong.com>: Jun 30 09:27AM +0800

On 30/06/2021 6:51 am, bitrex wrote:
 
> The "Turbo" board on these adds some of the nicest digital filters there
> were in a hardware sampler of the era:
 
> <https://www.youtube.com/watch?v=zEg60WzYco4Do
Do you mean the pot that adjusts the light level cannot provide enough
contrast without the :blockies: showing ? All the units I have seem
pretty bright without the "Blockies".
bitrex <user@example.net>: Jun 29 11:12PM -0400

On 6/29/2021 9:27 PM, Rheilly Phoull wrote:
> Do you mean the pot that adjusts the light level cannot provide enough
> contrast without the :blockies: showing ? All the units I have seem
> pretty bright without the "Blockies".
 
Yeah. It's a little difficult to capture this particular color scheme
correctly on a cell phone camera but at the maximum range of the control
it looks kinda like this:
 
<https://imgur.com/a/liLGsd9>
 
And unfortunately the contrast is controlled in software, probably via
PWM there's no direct connection to an analog adjustment pot.
 
I might swap it for an OLED display instead, or just go back to the
boring black on greenish-yellow. Hmpf.
bitrex <user@example.net>: Jun 29 11:18PM -0400

On 6/29/2021 9:27 PM, Rheilly Phoull wrote:
> Do you mean the pot that adjusts the light level cannot provide enough
> contrast without the :blockies: showing ? All the units I have seem
> pretty bright without the "Blockies".
 
I got pic of it by turning off the HDR on my camera, it looks about like
this at the maximum excursion of the contrast control. A lil worse in
the pic than it does in person.
 
<https://imgur.com/a/xEbbFZ5>
Rheilly Phoull <rheilly@bigslong.com>: Jun 30 11:28AM +0800

On 30/06/2021 11:18 am, bitrex wrote:
> this at the maximum excursion of the contrast control. A lil worse in
> the pic than it does in person.
 
> <https://imgur.com/a/xEbbFZ5>
 
Okay, I use the blue modules with the pot turned back until the blocks
are only a little darker than the background which isn't too bad.
"ohg...@gmail.com" <ohger1s@gmail.com>: Jun 29 11:02AM -0700

On Tuesday, June 29, 2021 at 11:01:36 AM UTC-4, Allodoxaphobia wrote:
 
> > It would run on Windows XP class hardware with sufficient RAM (2GB+).
> Of course, any discerning computer user would install linux or FreeBSD.
> That should work for CPUs down to "W95 Class".
 
I have a desktop PC at home I built about 2004 or thereabouts. It's a Pent IV with an Intel MB and XP Pro and all the RAM it can carry.
Never had a blue screen or any kind of issue or crash with it. Now, Firefox crawls and some pages don't load or load incompletely.
I tried installing two different distros Linux, and both were *more* laggy than the XP, so I went back to the XP. For work I have to use one of
my two laptops.
 
Sadly, it's time to pull the plug on this old friend and my new build will be with Linux, maybe Mint.
Michael Trew <mt999999@ymail.com>: Jun 29 02:15PM -0400

On 6/29/2021 11:01 AM, Allodoxaphobia wrote:
> Of course, any discerning computer user would install linux or FreeBSD.
> That should work for CPUs down to "W95 Class".
 
That would likely be the route I take... I will avoid anything Google as
much as possible. I really need to install it on one of my older
machines to toy with and get used to the interface, so I don't have a
"culture shock" the day that I finally need to switch.
Michael Trew <mt999999@ymail.com>: Jun 29 02:16PM -0400

> I tried installing two different distros Linux, and both were*more* laggy than the XP
 
Did you try something light like Puppy Linux?
Rob <nomail@example.com>: Jun 29 07:32PM


>> It would run on Windows XP class hardware with sufficient RAM (2GB+).
 
> Of course, any discerning computer user would install linux or FreeBSD.
> That should work for CPUs down to "W95 Class".
 
You can do that, but it would require that you study how to install
and admin that. The beauty of a ChromeBook is that it "just works".
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