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Search: Posts Made By: japlytic
Forum: Power Supply Design and Troubleshooting 12-29-2017, 12:58 AM
Replies: 13
Views: 233
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, 09:54 PM
Replies: 5
Views: 141
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, 09:46 PM
Replies: 10
Views: 324
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, 09:42 PM
Replies: 10
Views: 567
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, 01:23 AM
Replies: 0
Views: 100
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, 04:02 AM
Replies: 8
Views: 159
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 11-16-2017, 12:56 AM
Replies: 2
Views: 195
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, 06:55 AM
Replies: 1
Views: 84
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, 06:49 AM
Replies: 10
Views: 567
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, 06:47 AM
Replies: 2
Views: 195
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, 08:56 PM
Replies: 1
Views: 204
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, 07:09 AM
Replies: 27
Views: 678
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, 07:05 AM
Replies: 10
Views: 567
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, 03:40 AM
Replies: 9
Views: 378
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, 07:09 AM
Replies: 28
Views: 842
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...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 06-22-2017, 05:42 AM
Replies: 1
Views: 658
Posted By japlytic
Post Test equipment rebadges

Somehow, I have managed to identify certain pieces of rebadged electronics to their OEM.
If you know the rebadged model, there could be some hackability in it (especially if it runs on Linux!)

So...
Forum: Network Design & Troubleshooting 06-10-2017, 11:23 PM
Replies: 5
Views: 1,848
Posted By japlytic
Re: Some routers can be picky with USB storage devices

UPDATE: Under a Linux serial console when this problematic model of flash drive was plugged in, there was an indication that there was no DPO or FUA support for this model.
Forum: General Computer Discussion 06-10-2017, 05:15 PM
Replies: 0
Views: 267
Posted By japlytic
USB device detection problems in Oracle VM VirtualBox

In Oracle VM VirtualBox running Ubuntu 16.04 under Windows 10, I have trouble connecting USB devices (which have problems under Windows but not Linux) for emulation.
A useful workaround was to go to...
Forum: Custom Tweaks, Modifications, and Revisions 05-24-2017, 05:16 PM
Replies: 1
Views: 550
Posted By japlytic
Talking Startup chime

https://youtu.be/ZXWNtRUdwcQ
Forum: Equipment Usage, Soldering, Techniques, and Reviews 05-22-2017, 04:33 AM
Replies: 0
Views: 340
Posted By japlytic
Lightbulb Overcoming the pixel clock limit on programmable video generators

On my Black Star PVG1000 programmable video generator, I faced a limitation for very high resolutions (above 1280x1024 60 Hz) which was the maximum pixel clock rate being 110 MHz for my unit.
So at...
Forum: Power Supply Design and Troubleshooting 05-05-2017, 06:12 AM
Replies: 20
Views: 1,602
Posted By japlytic
Re: Reebok GT40s Treadmill power supply issue?

For this application, you would need a Schottky unit given its use at the output of a switching power supply.
What are the brands on the electrolytic capacitors on this board?
Forum: Other Devices with Bad Capacitors 05-03-2017, 05:18 AM
Replies: 1
Views: 930
Posted By japlytic
Eaton 5110 UPS

In an Eaton 5110 UPS, I saw C4 was bulging, and all of the electrolytics (of unknown brands) were all replaced with quality 105C units and this unit now works perfectly.
Notably, a number of these...
Forum: General Capacitor Questions & Issues 04-19-2017, 10:04 PM
Replies: 25
Views: 9,399
Posted By japlytic
Re: Fake Rubycon caps?

In a Tenma 72-10495 (Korad 3005D-2S rebadge), it had fake Rubycon USP series units (rated at 105șC, whereas genuine units of this series are actually rated at 85șC) for the input filter.
Although...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 04-19-2017, 10:01 PM
Replies: 12
Views: 1,013
Posted By japlytic
Re: Analog Scope vs Digital Scope

Digital scopes give you many more features an analog scope can't do (now, digital scopes are just as good as the analog ones), such as retaining the last captured waveform (especially single shot),...
Forum: General Computer Discussion 04-12-2017, 12:05 AM
Replies: 29
Views: 1,827
Posted By japlytic
Talking Samsung Galaxy Note 7 update could evolve into malware?

You probably have heard about the Samsung Galaxy Note 7 recall, and I have heard about an update being rolled out which would disable the unit including the charge function, but I believe there is a...
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