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Search: Posts Made By: eccerr0r
Forum: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals 10-21-2020, 09:50 AM
Replies: 12
Views: 297
Posted By eccerr0r
Re: Can I substitute these capacitors on a D865PERL motherboard?

Any comments specifically about the D865PERL boards longevity past bad caps and socket failure? I think I have one of these and the cpu has been "overheating" or at least crashing stating that it...
Forum: General Electronics Technical Discussion 10-17-2020, 01:09 AM
Replies: 9
Views: 152
Posted By eccerr0r
Re: Is the thermistor NTC? PTC? just by looking?

It's very possible the PTC on the right was indeed used from a degausser, but not the NTC on the left... I believe the NTC was from a SMPS.

Either way, I hate unmarked devices. And yes they...
Forum: General Electronics Technical Discussion 10-17-2020, 01:06 AM
Replies: 21
Views: 887
Posted By eccerr0r
Re: Need pointers to knowledge sources for electromagnetic application

You need thicker/less resistive/paralleled wire so you can drive more current using lower voltage (hint: those bldc motors have thick windings for a reason!), or possibly a core with higher...
Forum: General Electronics Technical Discussion 10-15-2020, 03:49 PM
Replies: 9
Views: 152
Posted By eccerr0r
Re: Is the thermistor NTC? PTC? just by looking?

Okay. Was hoping someone could tell after going through enough of them.

Hate it when parts aren't marked with something that can lead back to a datasheet somewhere...
Forum: Troubleshooting Power Supplies and Power Supply Design 10-15-2020, 03:36 PM
Replies: 11
Views: 201
Posted By eccerr0r
Re: A motor controller is a power supply, right?

A733 is TO92 but for your specific case it should work fine.

Sorry I can't help anymore, the data you give doesn't correlate to each other, too many either board track extract errors or...
Forum: Troubleshooting Power Supplies and Power Supply Design 10-15-2020, 12:42 PM
Replies: 11
Views: 201
Posted By eccerr0r
Re: A motor controller is a power supply, right?

In a properly working circuit the node that's common to all three bjt transistors (collector of first, bases of other two) should drop to near 0V when the "+5V" input to the first transistor and...
Forum: Troubleshooting Power Supplies and Power Supply Design 10-15-2020, 12:15 PM
Replies: 4
Views: 126
Posted By eccerr0r
Re: SMPS for charger Car battery

agreed, feedback will be ruined and could go overvoltage and overcharge battery.

He wants to "improve" his battery charger into a desulfator...
Forum: General Electronics Technical Discussion 10-15-2020, 01:52 AM
Replies: 9
Views: 152
Posted By eccerr0r
Re: Is the thermistor NTC? PTC? just by looking?

of these I do have in hand, intact, and OOC, left appears to be an ntc 25 ohm, other appears to be a ptc 20 ohm I think...
Forum: Troubleshooting Power Supplies and Power Supply Design 10-15-2020, 01:47 AM
Replies: 11
Views: 201
Posted By eccerr0r
Re: A motor controller is a power supply, right?

So your "simulation" schematic is wrong because as drawn, the gate drive is supposed to be 0V and the mosfets off. You'll need to retrace again.

In any case that transistor seems to have failed...
Forum: Troubleshooting Power Supplies and Power Supply Design 10-14-2020, 05:56 PM
Replies: 11
Views: 201
Posted By eccerr0r
Re: A motor controller is a power supply, right?

Is the voltages the way you measured on the board? Seems the circuit input is active low and when power needs to be supplied that input +5V needs to go to 0V.

As colored up and voltaged, with...
Forum: General Electronics Technical Discussion 10-13-2020, 11:12 PM
Replies: 9
Views: 152
Posted By eccerr0r
Re: Is the thermistor NTC? PTC? just by looking?

Err... the premise is that you can't touch. Can look, but not touch - so no heating or resistance measurements.

Actually why can't touch... assume the part is actually damaged beyond recognition...
Forum: General Electronics Technical Discussion 10-13-2020, 08:26 PM
Replies: 9
Views: 152
Posted By eccerr0r
Re: Is the thermistor NTC? PTC? just by looking?

Here are two samples, though there's another that a friend of mine was wondering, no pictures available...

NTC? PTC?
Forum: General Electronics Technical Discussion 10-13-2020, 05:48 PM
Replies: 9
Views: 152
Posted By eccerr0r
Is the thermistor NTC? PTC? just by looking?

I suppose this can be deduced when in circuit, but if an out of circuit or questionable connectivity thermistor is handed to you, is it possible to tell whether or not the thermistor is PTC or NTC,...
Forum: General Electronics Technical Discussion 10-09-2020, 07:55 PM
Replies: 4
Views: 135
Posted By eccerr0r
Re: resoldering a broken off fan wire

The ones I've run across the stator magnets come off with the pcb unglued. If it is actually glued then I think you're SOL and best you can do is carefully cut plastic on the other side and solder...
Forum: General Electronics Technical Discussion 10-08-2020, 11:47 AM
Replies: 11
Views: 184
Posted By eccerr0r
Re: Can a DC motor start then just ... stop?

Does it work at 12V?
If not, stj had the most likely reason.

If it works at 12V (and 8V)...then we're probably dealing with the behavior of the buck PSU that's turning the motor.
Forum: Troubleshooting Power Supplies and Power Supply Design 10-07-2020, 12:52 AM
Replies: 2
Views: 161
Posted By eccerr0r
How to use a wooden heatsink

https://maker.pro/custom/tutorial/how-to-make-constant-current-source-power-supply-circuit

:eek: Even with the fan the thermal resistance is quite high with just the TO-3 package...
Forum: Troubleshooting Game Consoles & Other Weird Devices 10-06-2020, 05:53 PM
Replies: 21
Views: 523
Posted By eccerr0r
Re: desk lamp stopped working... stars?

Actually changing the current is easy for me.
It's opening the stupid plastic welded-sealed PSU that's the hard part. :-(
Forum: Troubleshooting Game Consoles & Other Weird Devices 10-06-2020, 04:24 PM
Replies: 21
Views: 523
Posted By eccerr0r
Re: desk lamp stopped working... stars?

My current thinking is desolder the dead SMT LED and solder two 1W (1S, 300mA) LEDs in parallel though this is probably still going to end up with the same result as if I only put in one: one of the...
Forum: General Electronics Technical Discussion 10-06-2020, 10:47 AM
Replies: 22
Views: 233
Posted By eccerr0r
Re: Weird issues with stray voltage on prototype board

Nope, that would not explain why the meter goes to 0V when I disconnected the (+) probe... Also all measurements were set and release - I was not touching any part of the system after connecting:
...
Forum: General Electronics Technical Discussion 10-05-2020, 10:28 PM
Replies: 22
Views: 233
Posted By eccerr0r
Re: Weird issues with stray voltage on prototype board

This reminded me of another weird happening this morning. I had my analog VOM (some crappy 1KΩ/V IIRC) in 50V range, and had the (+) probe on a 55V power source. The (-) probe was left dangling.
...
Forum: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals 10-05-2020, 09:47 PM
Replies: 3
Views: 184
Posted By eccerr0r
Re: Dangerous chinese power strip kills motherboard, is it fixable?

uh no.

Unless it passed a surge or the power supply was garbage to begin with, a power strip won't kill computers.

The former, the surge/lightning was ultimately responsible, and the latter,...
Forum: General Computer & Tech Discussion 10-05-2020, 09:29 PM
Replies: 12
Views: 657
Posted By eccerr0r
Re: Random people pinging your computer...

Again what value is it especially when people filter ICMP, and a SYNACK response is more useful (since it tells the machine is up AND there's a possibly exploitable service responding)?

However I...
Forum: Troubleshooting Power Supplies and Power Supply Design 10-05-2020, 04:44 PM
Replies: 17
Views: 416
Posted By eccerr0r
Re: Shopping for a bench power supply, Advice?

probably using the term incorrectly, this is a switching supply. Linear is probably referring to the ability to linearly select voltage and current instead of having to go to discretely choose...
Forum: Troubleshooting Game Consoles & Other Weird Devices 10-05-2020, 03:42 PM
Replies: 21
Views: 523
Posted By eccerr0r
Re: desk lamp stopped working... stars?

I can desolder the LED from the plate too... well, with a back heater of course.
Forum: Troubleshooting Game Consoles & Other Weird Devices 10-05-2020, 12:28 PM
Replies: 21
Views: 523
Posted By eccerr0r
Re: desk lamp stopped working... stars?

Well, the PSU voltage range is 3.6V to 8V so it can drive a single (white) LED at 1.8W or two (white) LEDs in series at 3.6W, and can go up to 4W if the LEDs will go up to 8V.

Which means I could...
Showing results 1 to 25 of 500

 
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