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Search: Posts Made By: Curious.George
Forum: General Electronics Technical Discussion Yesterday, 05:00 PM
Replies: 8
Views: 63
Posted By Curious.George
Re: Need pointers to knowledge sources for electromagnetic application

You didn't visualize what I was saying.

Imagine your "mixture" is in a 4" diameter container (glass, metal, ...).
Get a 4.5" diameter container that is slightly taller than yours.
Invert it....
Forum: General Electronics Technical Discussion 08-04-2020, 06:19 PM
Replies: 8
Views: 63
Posted By Curious.George
Re: Need pointers to knowledge sources for electromagnetic application

You're building a motor with a "free-floating" armature.

Magnetic force falls off as the inverse square of distance. I.e., doubling the distance results in 1/4 of the available force.

In your...
Forum: General Electronics Technical Discussion 07-30-2020, 04:15 AM
Replies: 9
Views: 340
Posted By Curious.George
Re: Modifying a Engraving Laser Module with out a TTL Module

The risk, there, is that soldering to the terminals (the initial connection OR a repair) will have the iron "slip" and melt away one such tab.

[You have the switches there to examine; you can best...
Forum: General Computer & Tech Discussion 07-29-2020, 04:12 AM
Replies: 4,565
Views: 704,311
Posted By Curious.George
Re: best cheap/free scores 1.1

Finally got around to "breaking" through the registration process on the MAXX2 I rescued a while back (I don't use cell phones as phones). Though, having done that, I think I prefer my smaller LG...
Forum: General Electronics Technical Discussion 07-29-2020, 04:08 AM
Replies: 9
Views: 340
Posted By Curious.George
Re: Modifying a Engraving Laser Module with out a TTL Module

The switches shown are intended for direct mounting to a PCB. Had they been intended for a panel mount application, they would have had "ears" as well as holes in the "pins".

I'm leary of how...
Forum: General Electronics Technical Discussion 07-19-2020, 01:35 AM
Replies: 3
Views: 185
Posted By Curious.George
Re: Does anyone have experience with with a high power lasers for engraving recommend

I can't speak to the time involved...

The local makerhouse is currently having their laser repaired. One of the action items is to "add water cooling" (!) I think their's is 70W.

But, I have...
Forum: General Electronics Technical Discussion 07-18-2020, 11:57 AM
Replies: 3
Views: 185
Posted By Curious.George
Re: Does anyone have experience with with a high power lasers for engraving recommend

You might check to see what's used in laser cutters (find manuals/parts lists). It's hard to imagine that they would "cheap out" on the laser in such a device!
Forum: General Electronics Technical Discussion 07-17-2020, 01:56 AM
Replies: 31
Views: 773
Posted By Curious.George
Re: Power bricks in series?

The power supply shown is only capable of operating in the first quadrant.

Imagine taking a BATTERY (pick a variety of voltages) and connecting it across the output (i.e., a cap eventually loses...
Forum: General Electronics Technical Discussion 07-16-2020, 11:42 PM
Replies: 31
Views: 773
Posted By Curious.George
Re: Power bricks in series?

Put a solenoid on a power supply. Drive it with a switch. When you open the switch, there is a "kickback" -- current flows INTO the regulated output. There is a voltage spike on the output. Why...
Forum: General Electronics Technical Discussion 07-15-2020, 04:20 AM
Replies: 31
Views: 773
Posted By Curious.George
Re: Power bricks in series?

That depends on the design of the power supply.

If it is only capable of operating in the first quadrant, it simply won't work (in this configuration).
Forum: General Computer & Tech Discussion 07-11-2020, 09:49 PM
Replies: 27
Views: 541
Posted By Curious.George
Re: Dell 960 Memory Allocation

Huh? Who mentioned 8-bit CPUs?

And, 64 vs 32b is definitely a "hardware thing". A 32b OS is limited to a 32b logical address space simply because it (by definition) can't deal with pointers...
Forum: General Computer & Tech Discussion 07-11-2020, 04:34 PM
Replies: 27
Views: 541
Posted By Curious.George
Re: Dell 960 Memory Allocation

No, it only takes the OS's address space constraints out of the picture. If only 32 address lines are bonded out of the chip, then the limitation would persist in the HARDWARE.

I assume that such...
Forum: General Electronics Technical Discussion 07-11-2020, 04:30 PM
Replies: 23
Views: 1,222
Posted By Curious.George
Re: APC BACKUPS-RS550 not charging battery

Note that "leaving it plugged in" can result in the battery being cooked by the UPS (many UPSs don't flat the batteries properly) so that, when you actually NEED it, you find the battery is toast...
Forum: General Computer & Tech Discussion 07-11-2020, 03:54 PM
Replies: 27
Views: 541
Posted By Curious.George
Re: Dell 960 Memory Allocation

Disclaimer: I know nothing of how PC's work -- but a shitload about processors, in general!

[Presumably, you are running a 64b OS? Otherwise, you k now the total memory space will be limited to...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 07-11-2020, 03:16 AM
Replies: 14
Views: 501
Posted By Curious.George
Re: My Lenovo 6 16 just DIED

Can you poke around random (regulated) power points on the board (with a 'scope) while trying to turn it on? I.e., to see if it is TRYING to come up (and quitting) vs. "just plain dead"? Fans,...
Forum: General Electronics Technical Discussion 07-05-2020, 05:40 AM
Replies: 31
Views: 773
Posted By Curious.George
Re: Power bricks in series?

"Either" should be neither cuz you don't know how the load is wired wrt "earth".
Forum: General Electronics Technical Discussion 07-05-2020, 05:39 AM
Replies: 31
Views: 773
Posted By Curious.George
Re: Power bricks in series?

The load will determine the current (amperage) that will be drawn from EACH power supply (as the load current flows through one power supply, then the other before getting to the load).

This sort...
Forum: General Computer & Tech Discussion 07-05-2020, 05:23 AM
Replies: 4,565
Views: 704,311
Posted By Curious.George
Re: best cheap/free scores 1.1

Everything goes to a trusted colleague -- even if my other half is still alive -- to ensure all of the data is scrubbed and prototypes preserved (patent proofs). What he does with the remaining...
Forum: General Computer & Tech Discussion 07-03-2020, 08:38 PM
Replies: 4,565
Views: 704,311
Posted By Curious.George
Re: best cheap/free scores 1.1

You have to start earlier (in life) and keep remembering that anything coming in has to be offset by something going out!

I've managed to find new homes for all of my pinball machines (save one...
Forum: General Electronics Technical Discussion 06-29-2020, 04:09 AM
Replies: 9
Views: 496
Posted By Curious.George
Re: Dimmable LED incandescent replacements

That's what we have. The problem doesn't appear to be IN the dimmer but, rather, in how the lamp handles a certain "operating point" -- they dim linearly to a very low level. But, just before...
Forum: General Computer & Tech Discussion 06-25-2020, 09:25 PM
Replies: 4,565
Views: 704,311
Posted By Curious.George
Re: best cheap/free scores 1.1

Well, we are on the cusp of meeting our 1,000 piece (laptop) goal!
(presently, 920 on hand with a mid-July goal -- assuming, of course,
that "school", of some sort, starts up in August as...
Forum: General Electronics Technical Discussion 06-18-2020, 06:24 PM
Replies: 9
Views: 496
Posted By Curious.George
Re: Dimmable LED incandescent replacements

I think the bulbs are the bigger part of the problem. They've already got "smarts" to figure out how to drive the LEDs off of the AC signal so need a way to sort out when that "AC" has been...
Forum: General Computer & Tech Discussion 06-18-2020, 06:11 PM
Replies: 4,565
Views: 704,311
Posted By Curious.George
Re: best cheap/free scores 1.1

I decided against accepting the donation -- it would be yet another
make/model that I would have to support and, with just 30 pieces, the
effort didn't seem worth the time.

[I've been requesting...
Forum: General Computer & Tech Discussion 06-01-2020, 06:16 AM
Replies: 4,565
Views: 704,311
Posted By Curious.George
Re: best cheap/free scores 1.1

Any comments on "3D" (with glasses) displays on laptops? I've a business, here, looking to donate several and I'm not sure if they're worth the effort...
Forum: General Electronics Technical Discussion 06-01-2020, 06:08 AM
Replies: 9
Views: 496
Posted By Curious.George
Dimmable LED incandescent replacements

Has anyone had success using dimmable LED replacement bulbs? Which brand(s) and which dimmer(s)?

Despite using "recommended" (by lamp manufacturer) dimmers, we seem to end up with low frequency...
Showing results 1 to 25 of 500

 
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