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Search: Posts Made By: japlytic
Forum: Troubleshooting Power Supplies and Power Supply Design 02-18-2019, 12:53 AM
Replies: 1
Views: 47
Posted By japlytic
Talking Why hot swap server PSUs are derated for lower line voltages

I compared two 1200W units (both with active PFC) around the same manufacturing time, an ATX unit and a compact hot swap server unit: the ATX unit had 780uF input DC filtering capacitance compared to...
Forum: General Capacitor Questions & Issues 02-02-2019, 07:33 PM
Replies: 2
Views: 142
Posted By japlytic
Talking Chemi-Con caught price fixing

https://www.justice.gov/opa/pr/leading-electrolytic-capacitor-manufacturer-ordered-pay-60-million-criminal-fine-price-fixing
https://www.justice.gov/atr/case/us-v-nippon-chemi-con-corporation

And...
Forum: Troubleshooting & Designing Networks 01-29-2019, 07:04 PM
Replies: 0
Views: 122
Posted By japlytic
Definition of "mainstream" for cellular networks 2G onwards

My definition of "mainstream" for network generations 2G onwards is when services are introduced on the lower frequency (<1 GHz) bands after services are introduced on the higher frequency (>1 GHz)...
Forum: General Capacitor Questions & Issues 01-29-2019, 06:45 PM
Replies: 7
Views: 193
Posted By japlytic
Forum: Custom Tweaks, Modifications, and Revisions 01-15-2019, 01:54 AM
Replies: 2
Views: 187
Posted By japlytic
TV160 LCD controller tester: Self-powering mod

So that this test unit can be powered by the LCD controller without requiring an external power supply (it can handle DC input voltages as low as 5V and up to at least 12V), identical low loss...
Forum: Troubleshooting TVs and Video Sources 01-12-2019, 07:28 PM
Replies: 3
Views: 90
Posted By japlytic
Re: DSE GE6987 LCD TV main board (303C3393073) - DDR SDRAM voltage

The MSD6306 is DVB while the MSD3393 is ATSC.
Forum: Troubleshooting TVs and Video Sources 01-11-2019, 08:54 PM
Replies: 3
Views: 90
Posted By japlytic
Talking DSE GE6987 LCD TV main board (303C3393073) - DDR SDRAM voltage

This board is almost identical to the Haier 55E3500, and in both controllers, DDR SDRAM is integrated.
When connected to a power supply and LCD controller tester, a brief "Loading" message appeared...
Forum: General Electronics Technical Discussion 01-07-2019, 02:09 AM
Replies: 49
Views: 3,126
Posted By japlytic
Re: Feit electric LED lamp autopsy.

22 years life? Warranty, please!
Forum: General Electronics Technical Discussion 01-06-2019, 01:04 AM
Replies: 9
Views: 124
Posted By japlytic
Re: Washer or oven - tripped RCD question.

I've experienced RCDs tripping due to back-EMF when an inductive load is energized at or near the high peak of the AC waveform.
Forum: Troubleshooting Power Supplies and Power Supply Design 12-25-2018, 09:51 PM
Replies: 4
Views: 210
Posted By japlytic
Exclamation Unknown pogo pin Li-Po battery charger - the unsafest I have seen!

Bought this unit from an Australian seller on eBay, and both pogo pins are moveable to suit just about any single cell Li-Po battery.
Inside is a single half-wave rectifier with a 2.2uF/400V filter...
Forum: Troubleshooting Power Supplies and Power Supply Design 12-16-2018, 07:18 AM
Replies: 35
Views: 808
Posted By japlytic
Re: Ham/CB/other transmitter radios... linear vs switching PSU?

It may be hard to find in specifications, but frequency jittering (helps reduce EMI) is a good feature to look for in a switching power supply for this application.
Forum: Equipment Usage, Soldering, Techniques, and Reviews 10-24-2018, 02:51 AM
Replies: 14
Views: 920
Posted By japlytic
Re: Aliexpress oscilloscope....good idea/bad idea ?

Hantek generally has good hardware, but their weak spot is the software.
Forum: Troubleshooting Power Supplies and Power Supply Design 10-24-2018, 02:49 AM
Replies: 3,000
Views: 726,640
Posted By japlytic
Re: Power supply build quality pictorial. part 2

VSN-011 Arcade Power Supply (+5V/7A, -5V/1A, -12V/1A)

All capacitors are QRT brand unless otherwise noted.
100uF 400V Chemi-Con primary side filter.
3300uF 10V x2 before +5V inductor with 3300uF...
Forum: Troubleshooting & Designing Networks 10-12-2018, 08:15 PM
Replies: 2
Views: 219
Posted By japlytic
No shares within a workgroup appearing

On a new Windows 10 install, I cannot see other computers on the network even though I am on the correct workgroup name despite seeing other network devices which do not use a workgroup and that...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 07-24-2018, 06:34 AM
Replies: 4
Views: 295
Posted By japlytic
Test equipment and 1PPS inputs

You've most likely seen test equipment with an external reference clock input, but I think a 1PPS input (or support for it) should also be included considering it is easier to route a 1PPS signal...
Forum: General Electronics Technical Discussion 07-07-2018, 01:35 AM
Replies: 14
Views: 564
Posted By japlytic
Re: PAL Connectors on TVs

I've read that Belling-Lee, the inventor of this connector, has advised that this connector is only suitable for radio and not TV, and for that reason, I insist on F connectors on both sides of the...
Forum: Troubleshooting & Designing Networks 07-02-2018, 02:24 AM
Replies: 5
Views: 527
Posted By japlytic
Re: Wireless access points and Local Network IPv6 State

To clarify, the router for Internet access has DHCP enabled for both IPv4 and IPv6.
Forum: General Electronics Technical Discussion 06-23-2018, 09:27 PM
Replies: 16
Views: 752
Posted By japlytic
Re: Digital AC100-300V BLUE LCD DISPLAY PANEL VOLT/AMP meter WITH SPLIT 0-100A CT

On my unit, I used a digital voltmeter display which has a minimum voltage of 60 VAC, but the display was just visible down to 30 VAC - this would be unreasonably low, since the connected appliance...
Forum: Troubleshooting & Designing Networks 06-23-2018, 09:23 PM
Replies: 5
Views: 527
Posted By japlytic
Smile Wireless access points and Local Network IPv6 State

On a Technicolor TG800vac being used as a wireless access point (DHCP turned off and IP address not within DHCP range of another router), I had a problem where Android devices would not connect to...
Forum: General Electronics Technical Discussion 05-07-2018, 02:26 AM
Replies: 4
Views: 292
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, 02:19 AM
Replies: 5
Views: 509
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, 03:54 AM
Replies: 0
Views: 182
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, 06:05 PM
Replies: 9
Views: 471
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, 05:58 PM
Replies: 8
Views: 443
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, 05:56 PM
Replies: 9
Views: 471
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...
Showing results 1 to 25 of 500

 
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