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Search: Posts Made By: megaraider
Forum: Equipment Usage, Soldering, Techniques, and Reviews Today, 02:16 AM
Replies: 140
Views: 18,335
Posted By megaraider
Re: New tool to find short capacitors on motherboards : shorty with display

e)
Changing supply voltage from 5V to 3.3V will degrade performance and accuracy for both MCP3421 (INL vs. Supply Voltage) and AD8628 (Signal Voltage Gain).

f)
Even for DIY project it's taking...
Forum: Equipment Usage, Soldering, Techniques, and Reviews Yesterday, 07:20 PM
Replies: 140
Views: 18,335
Posted By megaraider
Re: New tool to find short capacitors on motherboards : shorty with display

[And above posts...]

My thoughts FWIW:
a)
Is portability so important (at least at this stage)?
We all know it will be sitting on our workbench... will it not!
For what's worth we can even...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 06-29-2022, 03:51 PM
Replies: 10
Views: 350
Posted By megaraider
Re: Short finder

No need :wink:
The current source problem arises from using the 5V output line from the Arduino Nano.
As he wrote somewhere he couldn't figure out why the voltage (5V) dropped when the tips were...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 04-18-2022, 09:05 PM
Replies: 26
Views: 1,769
Posted By megaraider
Re: Analog Multimeter Readings

Yes there are some Notitake datasheets and even some Arduino libraries available. For Noritake VFD PW-899-101 (Noritake Itron GU140X16G-7000 Dot Graphic VFD Display Module) the Arduino library...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 04-18-2022, 02:22 PM
Replies: 26
Views: 1,769
Posted By megaraider
Re: Analog Multimeter Readings

That's what i described you would most likely find onboard a VFD.
A ĶC scanning (multiplexing) the vfd (most likely thru an IC because voltage levels) and a serial (often 3 wire) interface...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 04-16-2022, 01:27 PM
Replies: 26
Views: 1,769
Posted By megaraider
Re: Analog Multimeter Readings

As i recall they used a multiplex scan circuitry IC (maxim i believe) connect to a ĶC. You might get better luck disassembling it and walking your way thru.


imo it's to expensive for the specs,...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 04-14-2022, 02:43 PM
Replies: 26
Views: 1,769
Posted By megaraider
Re: Analog Multimeter Readings

The pictures may help...
Test leads are unconnected (Needle in rest position):

VOM: ∞Ω -> Correct
VTCOM: 0Ω -> Incorrect
DMM: 'OL' = ∞Ω -> Correct
Forum: Equipment Usage, Soldering, Techniques, and Reviews 04-13-2022, 06:27 PM
Replies: 26
Views: 1,769
Posted By megaraider
Re: Analog Multimeter Readings

How come...? Take an example where the test leads are unconnected: both VOMs and DMMs will read 0 in V & A and 'infinite' or 'OL' in Ohm > Correct.
Unlike Vacuum Tube VOMs (VTVOMs) that will read 0...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 04-09-2022, 04:25 PM
Replies: 26
Views: 1,769
Posted By megaraider
Re: Analog Multimeter Readings

It all comes down to basic stuff, much like riding a bike...:smile:
Of course digital tends to be more direct forward making readings because we don't have to pay attention to the multiply knob...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 04-07-2022, 06:15 PM
Replies: 203
Views: 98,486
Posted By megaraider
Re: CH341a SPI / I≤C programmer

Yes i meant an oscilloscope, but a multi meter (if with enough samples /s) set to V would work, or instead set to frequency reading.


That's good news :d
No ridiculousness involved. Sometimes...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 04-06-2022, 11:54 AM
Replies: 203
Views: 98,486
Posted By megaraider
Re: CH341a SPI / I≤C programmer

Since the programmer, CH341A, is recognized both by OS and the software the CH341A isn't dead.
Because you've done the 3.3V voltage supply tweak if any input/output pins came in touch with 5V most...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 04-05-2022, 11:14 AM
Replies: 203
Views: 98,486
Posted By megaraider
Re: CH341a SPI / I≤C programmer

Pins 6, 7, 8 are input pins and left floating in CH341A programmer.
See the attached schematic and try to figure out what's wrong (though there are several versions available).
Forum: Equipment Usage, Soldering, Techniques, and Reviews 03-20-2022, 09:48 PM
Replies: 18
Views: 1,299
Posted By megaraider
Re: Anyone ever hear of this solder brand before?

According to the label we can only tell it contains flux type P2 > hence Rosin.
As for percentage it's unspecified.


It's a little worse... if "Val." stands for "valid / validity" as it should,...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 02-24-2022, 04:12 PM
Replies: 8
Views: 734
Posted By megaraider
Re: TL866A - need to program 25Q21BT but device not on list

When compared the only difference seems to be that GD25Q21B is able to do Quad SPI, which isn't relevant when programming. Other details as programmable page size (256-bytes), Sector/Block size, and...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 02-23-2022, 04:34 PM
Replies: 8
Views: 734
Posted By megaraider
Re: TL866A - need to program 25Q21BT but device not on list

That 'G' logo stands for 'GigaDevice'
The ID code: 0xC84012 is match for 'GD25Q21B'
Datasheet may be found here: https://www.tme.com/Document/0aabca24cb319b18c7e80fd2a6095337/gd25q21b.pdf
btw,...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 02-19-2022, 02:36 PM
Replies: 5
Views: 742
Posted By megaraider
Re: New Laser Soldering tool

Nothing else than a fool guy playing with dangerous a new toy :duh:
Even by the way he uses the tweezers, picking up discrete components by the soldered ends, one can tell he's :noob:
Forum: Equipment Usage, Soldering, Techniques, and Reviews 02-02-2022, 04:47 PM
Replies: 13
Views: 1,310
Posted By megaraider
Re: CH341 Programmer - any good for 1.8V?

You probably already have, nevertheless don't forget the test clip, it come in handy.
Forum: Equipment Usage, Soldering, Techniques, and Reviews 01-01-2022, 10:51 PM
Replies: 26
Views: 2,561
Posted By megaraider
Re: Current / voltage injection donít work for me.

Aren't you looking for a faulty component? If it burns out what's the problem since it was faulty to begin with.

Neither to me...!

It was never my intention, neither i did it. Just want to...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 12-30-2021, 10:10 PM
Replies: 26
Views: 2,561
Posted By megaraider
Re: Current / voltage injection donít work for me.

Sorry but you're wrong!
All other components, not faulty, fed by the shorted power rail will only draw the current they need.
Forum: Equipment Usage, Soldering, Techniques, and Reviews 12-28-2021, 09:03 PM
Replies: 26
Views: 2,561
Posted By megaraider
Re: Current / voltage injection donít work for me.

Why are you worried about not being current limited? The PSU will only provide the current needed that may well be much less than 20A max. current output.
In the event the faulty component burns out...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 12-25-2021, 05:27 PM
Replies: 26
Views: 2,561
Posted By megaraider
Re: Current / voltage injection donít work for me.

Don't mess with the charge adapter. Most likely you'll burn the power regulators and Mosfets on board!
Any decent rescued ATX power supply will provide [email protected] output. More than enough...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 12-23-2021, 10:22 PM
Replies: 26
Views: 2,561
Posted By megaraider
Re: Current / voltage injection donít work for me.

Stick to this rule!:


First identify the shorted power rail. Then stick to the above rule for current injection.
Keep in mind that all components (caps, etc) connected directly to this power...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 12-18-2021, 02:23 PM
Replies: 26
Views: 2,561
Posted By megaraider
Re: Current / voltage injection donít work for me.

Forgot to mention:
desktop motherboards, because easy accessed, are prone to misuse, people keep exchange modules. Inspect with a magnifying lens all sockets (RAM, PCIe, ...), search for bend /...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 12-17-2021, 04:30 PM
Replies: 26
Views: 2,561
Posted By megaraider
Re: Current / voltage injection donít work for me.

Not necessarily, it might be auto shutting down due to overload. You will need a higher power rated PSU.
Inspect visually the MB, search for damages, most likely caused by those massive cooling heat...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 11-08-2021, 02:22 PM
Replies: 43
Views: 8,378
Posted By megaraider
Re: New Cheap Chinese Soldering Plates

Agree, LED strips and tools to work with aren't new :p:
Showing results 1 to 25 of 270

 
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