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Search: Posts Made By: japlytic
Forum: General Electronics Technical Discussion 05-07-2018, 01:26 AM
Replies: 4
Views: 127
Posted By japlytic
Re: Do NTC inrush limiters wear out?

On a related subject, the "on" resistance of PTC resistors will increase to the point where it will be unusable every time the maximum current is exceeded.
Forum: General Capacitor Questions & Issues 05-07-2018, 01:19 AM
Replies: 5
Views: 196
Posted By japlytic
Re: Replacing Rubycon CE W with Rubycon YXF

From what I see, general purpose units are suitable for this application since the aforementioned units use a linear (non switching) power supply.
Forum: General Computer Discussion 03-13-2018, 02:54 AM
Replies: 0
Views: 80
Posted By japlytic
Lightbulb Connecting to Bluetooth LE-only devices

With an HM10 Bluetooth Low Energy (LE) module, the Bluetooth dongle (without LE support) connected to my computer would not detect the HM10 while my smartphone with LE support can; so therefore, the...
Forum: Troubleshooting Power Supplies and Power Supply Design 02-09-2018, 05:05 PM
Replies: 9
Views: 217
Posted By japlytic
Re: Replacement Rifa caps for Astec PSU

I forgot to say that the 0.22uF X unit should also be replaced (X-class, safety type).
Forum: General Electronics Technical Discussion 02-09-2018, 04:58 PM
Replies: 8
Views: 262
Posted By japlytic
Re: "Anticounterfeiting" technology

With printer cartridges, the companies are basically fuelling the problem, and I have seen printers on sale at prices worth more than the cartridges from time to time which would highlight the...
Forum: Troubleshooting Power Supplies and Power Supply Design 02-09-2018, 04:56 PM
Replies: 9
Views: 217
Posted By japlytic
Re: Replacement Rifa caps for Astec PSU

The 2200pF VDE unit is a Y-class (safety) unit, and the 0.68uF unit can be replaced with a polyester unit.
In addition, I recommend replacing the other 2200pF VDE unit (near C4) along with C37 and...
Forum: General Computer Discussion 01-26-2018, 02:53 AM
Replies: 3
Views: 317
Posted By japlytic
Re: Raspberry Pi HDMI problems re. power supplies

I have changed the hotplug option and is OK without the need to delay the DC.
Forum: General Computer Discussion 01-26-2018, 12:25 AM
Replies: 4
Views: 129
Posted By japlytic
Lightbulb Raspberry Pi 3: a heatsink on the SOC is recommended

On a Raspberry Pi 3, I got an overtemperature warning despite not being overclocked during a long compile operation, so I used a stick-on heatsink over the Broadcom SOC and I did not have this...
Forum: General Electronics Technical Discussion 01-25-2018, 12:44 AM
Replies: 4
Views: 216
Posted By japlytic
Re: Why are N-Channel mosfets used here on the battery gauge lines?

I've seen N-channel MOSFETs on power tool battery packs which serve as an overdischarge and overcurrent protection function.
Forum: Network Design & Troubleshooting 01-25-2018, 12:41 AM
Replies: 1
Views: 888
Posted By japlytic
Smile Netflix VR dropping back to Who's Watching

I had problems where Netflix VR randomly drops back to the "Who's Watching?" screen without an error message, and I happened to catch a network error message when I tried to sign in at one time,...
Forum: Troubleshooting Power Supplies and Power Supply Design 12-28-2017, 11:58 PM
Replies: 13
Views: 333
Posted By japlytic
Re: -12V-less HP server unit: does majority of current boards even require the rail?

PCI slots have a -12V contact while PCI Express slots do not have any connection to -12V.
From what I know, older PCI serial port and older PCI network cards require -12V; later PCI serial port...
Forum: General Computer Discussion 12-17-2017, 08:54 PM
Replies: 5
Views: 187
Posted By japlytic
Exclamation How not to be burned by new Android devices

Here are the two basics:

Look for a commitment from the manufacturer to provide firmware updates for a reasonable time after the device model is discontinued - avoid devices which are not offered...
Forum: General Electronics Technical Discussion 12-16-2017, 08:46 PM
Replies: 10
Views: 395
Posted By japlytic
Re: Use 74LS instead 74HC and 74HCT

74LS/74HCT runs on 5V while 74HC can run on on 3-5V.
Forum: Equipment Usage, Soldering, Techniques, and Reviews 12-16-2017, 08:42 PM
Replies: 10
Views: 659
Posted By japlytic
Re: Conventional vs arbitrary function generators

For new units on eBay, there are more listings for arbitrary units than conventional units.
Forum: General Computer Discussion 11-21-2017, 12:23 AM
Replies: 0
Views: 158
Posted By japlytic
Thumbs up Apple is leading the way...

...in cellular band support for new devices, from what I know.
The ultimate goal I wish to see is for new devices which can connect to a cellular network to support every GSM/UMTS/LTE band from 300...
Forum: General Computer Discussion 11-17-2017, 03:02 AM
Replies: 8
Views: 217
Posted By japlytic
Talking Cellular signal bar scales

I have noticed on Windows Phone and Apple devices that the cellular signal bar scales have five bars while Android devices only have four, and I am curious why.
Fortunately, my automotive audio...
Forum: General Computer Discussion 11-15-2017, 11:56 PM
Replies: 3
Views: 317
Posted By japlytic
Re: Raspberry Pi HDMI problems re. power supplies

I tried chaning the HDMI drive parameter but not the hot plug option.
Forum: Troubleshooting TVs and Video Sources 10-28-2017, 05:55 AM
Replies: 1
Views: 146
Posted By japlytic
Talking HDMI splitter backfeeds +5V into source

On a Raspberry Pi 3, I had a problem where the Pi would not start properly when +5V is connected through its usual Micro USB connector, which I traced to a externally powered HDMI splitter...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 10-28-2017, 05:49 AM
Replies: 10
Views: 659
Posted By japlytic
Re: Conventional vs arbitrary function generators

It depends on what filters you switch in and how good the filters are at a given frequency.
Forum: General Computer Discussion 10-28-2017, 05:47 AM
Replies: 3
Views: 317
Posted By japlytic
Raspberry Pi HDMI problems re. power supplies

On a Raspberry Pi 3, I had a problem with a particular power supply (5V 3A - IC controller, all caps changed) which there is disk activity but no HDMI output; when I disconnected the Micro USB power...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 10-14-2017, 07:56 PM
Replies: 1
Views: 238
Posted By japlytic
Talking Oscilloscope default pre-trigger window position

On LeCroy oscilloscopes, the default pre-trigger viewing window is one horizontal division from the left while Tektronix (and a number of Chinese manufacturers including Hantek) has a default...
Forum: General Electronics Technical Discussion 09-19-2017, 06:09 AM
Replies: 27
Views: 820
Posted By japlytic
Re: FM Jammer project

On a related subject, how about a TV station jammer?
Forum: Equipment Usage, Soldering, Techniques, and Reviews 09-19-2017, 06:05 AM
Replies: 10
Views: 659
Posted By japlytic
Conventional vs arbitrary function generators

These days, I recommend arbitrary function (waveform) generators over conventional function generators given arbitrary function generators are easier to use (especially with a waveform display), more...
Forum: General Electronics Technical Discussion 08-31-2017, 02:40 AM
Replies: 9
Views: 471
Posted By japlytic
Re: EMI filter before transformer, good or bad ?

I've seen X and Y class capacitors lose capacitance throughout their electrical life (and therefore, EMI filtering is degraded), so they should be checked (with one end disconnected) after...
Forum: General Electronics Technical Discussion 07-19-2017, 06:09 AM
Replies: 28
Views: 1,021
Posted By japlytic
Re: Fake Samsung Charger Sold by SnoCo Inc. on Amazon (Reported to Amazon)

On a related subject, there are a lot of fake Apple chargers on Amazon (and other places) as well (there was even a lawsuit against a company suppling fakes) - check out the UL report at...
Showing results 1 to 25 of 500

 
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