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Search: Posts Made By: ben7
Forum: Troubleshooting Power Supplies and Power Supply Design 01-10-2018, 06:32 AM
Replies: 1,526
Views: 286,703
Posted By ben7
Re: the gutless, bloated, and fried power supply hall of shame

Is it just me, or has that "2003" control IC gone poof? :)

-Ben

P.S. Looks like you struck gold ... er, brown, crispy gold. :tongue:
Those cheapo PSUs are probably good for 200W max, and even...
Forum: Troubleshooting Audio Equipment 01-05-2018, 07:14 PM
Replies: 48
Views: 1,928
Posted By ben7
Re: Pioneer Speaker Package subwoofer transformer.

Something like this may work. Dual primary (117/234V), 48V @ 4A output, center-tapped (so it's 24V-0-24V)....
Forum: Troubleshooting Audio Equipment 01-05-2018, 06:40 PM
Replies: 13
Views: 703
Posted By ben7
Re: Onkyo tx sr 607 -New DSP chip installed

SRT1, are there any other BGA chips on your board?

To me, seeing that it works after a few hours of idle time makes me think that there is a thermal issue, like a bad solder connection which...
Forum: General Electronics Technical Discussion 01-05-2018, 06:28 PM
Replies: 1
Views: 283
Posted By ben7
Green LEOTEK LED traffic light insert! [Teardown/pics]

My father found a green LED traffic light insert thing in the intersection in front of his workplace. The lights at the intersection were all there, so it must have fallen off of a truck or work...
Forum: Troubleshooting Power Supplies and Power Supply Design 01-05-2018, 05:37 PM
Replies: 6
Views: 841
Posted By ben7
Re: ANTMINER S9 power circuit

Might very difficult if not impossible to fix due to the PIC chip. It might be read protected, or completely fried, etc..
Forum: General Electronics Technical Discussion 01-05-2018, 05:08 PM
Replies: 25
Views: 732
Posted By ben7
Re: Overvoltage protection design ideas

The simplest thing I can see doing is to connect a suitably sized power transformer across the AC input before the UPS transformer, and connect the output of the power transformer in series,...
Forum: General Electronics Technical Discussion 01-05-2018, 04:38 PM
Replies: 17
Views: 518
Posted By ben7
Re: Transformer in UPS runs warm for no apparent reason

That sounds normal to me. It's normal for a transformer to be warm even when unloaded, due to the "eddy current" losses in the iron core.

This is why environmentalists don't like iron-core...
Forum: General Capacitor Questions & Issues 12-15-2017, 05:21 PM
Replies: 6
Views: 454
Posted By ben7
Re: Good motor capacitors for an MOT?

Just get a 10kVA or similar size distribution transformer (or two!). Much easier, plus those can handle a larger amount of power. MOTs will overheat easily if you don't ballast them.

Also keep in...
Forum: General Capacitor Questions & Issues 12-15-2017, 05:04 PM
Replies: 8
Views: 355
Posted By ben7
Re: Bad NCC SMQ 220/400 in 2006 Seasonic S12II

It's possible that the capacitor failure caused the diode to fail due to excessive ripple current or something like that.

I haven't seen it myself yet, but I've heard of rare occasions where the...
Forum: Troubleshooting Power Supplies and Power Supply Design 09-03-2017, 11:40 PM
Replies: 1,526
Views: 286,703
Posted By ben7
Re: the gutless, bloated, and fried power supply hall of shame

Coworker brought to me a Chicago Electric 2kW inverter (model 92464) that he picked up for $30. He wanted my opinion as to how well built it is ...

First off, note that it is a two-board design....
Forum: General Capacitor Questions & Issues 09-27-2016, 10:56 AM
Replies: 15
Views: 1,496
Posted By ben7
Re: ESR Mania

^^^ I second this, even though I don't have a proper ESR meter yet. I've gone looking around and found good/decent ones for a decent price.

Heck, if you repair lots of stuff, even spending $100 on...
Forum: Troubleshooting Power Supplies and Power Supply Design 02-24-2016, 08:03 AM
Replies: 33
Views: 8,225
Posted By ben7
Re: DELL OEM H240AS-00 (HIPRO) ~ major blow up!

Well the more modern CapXon capacitors have been fine in devices like PSUs and such ... it was just those from the bad cap plague era that were a problem.

Then again, yes, I still don't fully...
Forum: Troubleshooting Power Supplies and Power Supply Design 02-24-2016, 07:32 AM
Replies: 2,953
Views: 683,753
Posted By ben7
Re: Power supply build quality pictorial. part 2

Very nice power supply, Wester547!
:hump:

Cheers,
-Ben
Forum: Troubleshooting Power Supplies and Power Supply Design 02-24-2016, 07:24 AM
Replies: 33
Views: 8,225
Posted By ben7
Re: DELL OEM H240AS-00 (HIPRO) ~ major blow up!

Ahh, okay, thanks for the info! :D

I've since fixed the computer. Sorry for not giving an update until now...
I bought a replacement PSU. I actually opened that up (I know, tsk tsk tsk).
It is...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 02-14-2016, 07:34 AM
Replies: 949
Views: 77,703
Posted By ben7
Re: ESR meter upgrades

Ohhhhhhhhh...... :owned:
LOL XD

I see ... hmm ...
Welp, I could do without the fet and triac testing feature for the moment I guess.
I'll have to take a look at just how it measures those, to...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 02-13-2016, 09:37 PM
Replies: 949
Views: 77,703
Posted By ben7
Re: ESR meter upgrades

1. You can drive certain fets with 3.3V ... the FDV304P, a P-channel device, has a typical gate threshold voltage of 0.86V! Granted, it's not a power fet, but it can be used to switch other things on...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 02-13-2016, 06:49 PM
Replies: 949
Views: 77,703
Posted By ben7
Re: ESR meter upgrades

I'm thinking ... I have two different STM32 "nucleo" dev boards, I wonder if I can translate/port this code to one of those ... I'm becoming more and more interested in building one of these :p:...
Forum: Troubleshooting Audio Equipment 02-12-2016, 12:57 PM
Replies: 159
Views: 10,018
Posted By ben7
Re: Need Help with this Circuit Please

I know I'm responding to an old post, (well from a few months ago) but this is the reason why you DON'T depend circuits from the internet, especially if the source is questionable.

I've previously...
Forum: Troubleshooting Game Consoles & Other Weird Devices 02-12-2016, 12:43 PM
Replies: 10
Views: 1,692
Posted By ben7
Re: Odd PS3 USB Hub Problem (power backfeed?)

Yeah, I wonder if this one is fake or mis-labeled... like those 99 cent chinese USB SD card readers, which don't read all cards, and fail like crazy.

-Ben
Forum: Troubleshooting Power Supplies and Power Supply Design 02-09-2016, 10:59 AM
Replies: 15
Views: 2,886
Posted By ben7
Forum: Troubleshooting Power Supplies and Power Supply Design 02-09-2016, 06:12 AM
Replies: 12
Views: 1,595
Posted By ben7
Re: Utilitech LED light strip

One would think so, but I think if the resistors are poorly manufactured, then it might be a possibility. I just read about this failure mode the other day lol :p:

-Ben
Forum: Troubleshooting Power Supplies and Power Supply Design 02-08-2016, 11:23 AM
Replies: 2
Views: 1,077
Posted By ben7
Re: Stinky Emacs AX2-5300FB-2S

Would like to see an update :groucho:
Forum: Troubleshooting Power Supplies and Power Supply Design 02-08-2016, 11:22 AM
Replies: 12
Views: 1,595
Posted By ben7
Re: Utilitech LED light strip

Interesting board.

Did it stop working right when water was spilled on it?
If it took a while for it to stop working, my guess would be that one or more of the SMD resistors has corroded. They...
Forum: Troubleshooting Power Supplies and Power Supply Design 02-08-2016, 11:10 AM
Replies: 5
Views: 846
Posted By ben7
Re: Need Advice to use the good power supply laptop

It shouldn't cause a problem.

If anything, it's slightly better because the extra half a volt will compensate for the resistance in the power cord when it is heavily loaded. :)

-Ben
Forum: Troubleshooting Power Supplies and Power Supply Design 02-08-2016, 10:53 AM
Replies: 15
Views: 2,886
Posted By ben7
Re: CompUSA PowMax LP-6100 this is as good as they get!

Hah, I think that's one the few times I've seen different diodes used in one bridge rectifier. (On the AC input)
Funny, I really wonder why they did that XD

-Ben
Showing results 1 to 25 of 500

 
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