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Search: Posts Made By: PeteS in CA
Forum: Troubleshooting Power Supplies and Power Supply Design 09-13-2019, 05:49 PM
Replies: 1,587
Views: 326,128
Posted By PeteS in CA
Re: the gutless, bloated, and fried power supply hall of shame

I noticed that the output caps are Nichicon HE, which is a very good series, generally. However they use a water-based electrolyte, which do less well than non-aqueous solvent-based electrolytes with...
Forum: Troubleshooting Power Supplies and Power Supply Design 09-11-2019, 03:29 PM
Replies: 1,587
Views: 326,128
Posted By PeteS in CA
Re: the gutless, bloated, and fried power supply hall of shame

If that thing is identical to the L-LINK you linked, it's basically a 150W power supply. I doubt the main transformer core is good for 200W, and those input electrolytics might have decent filtering...
Forum: Troubleshooting Power Supplies and Power Supply Design 09-06-2019, 02:50 PM
Replies: 1,587
Views: 326,128
Posted By PeteS in CA
Re: the gutless, bloated, and fried power supply hall of shame

Yeah, that 150W P/S is not very safe, given the GP ceramic caps where safety-rated Y-caps should be. The 330uF primary lytics and that gimmicked 12V "rectifier" pretty much make 150W the realistic...
Forum: Troubleshooting Power Supplies and Power Supply Design 08-28-2019, 01:47 PM
Replies: 1,587
Views: 326,128
Posted By PeteS in CA
Re: the gutless, bloated, and fried power supply hall of shame

470uF would probably be OK for 250W, for ripple and for hold-up time, but better than necessary is a good thing.
Forum: Troubleshooting Power Supplies and Power Supply Design 08-27-2019, 03:47 PM
Replies: 1,587
Views: 326,128
Posted By PeteS in CA
Re: the gutless, bloated, and fried power supply hall of shame

What a gut-free POS! The best thing that could be said for it is that they didn't substitute GP ceramic caps for Y-caps. They didn't install anything for Y-caps. And while the MJE13007 clones and the...
Forum: General Capacitor Questions & Issues 08-15-2019, 11:42 AM
Replies: 954
Views: 405,692
Posted By PeteS in CA
Re: The Hall of Shame - Badcaps Photo Montage

Well, on one hand I'm pretty sure that's a low quality brand, but on the other, it's about 12 1/2 years old. Even if it has needed hair dryer help for 2 years, that's a reasonably decent life.
Forum: General Capacitor Questions & Issues 08-14-2019, 05:16 PM
Replies: 4
Views: 176
Posted By PeteS in CA
Re: Finding a replacement cap for my snap in capacitor

Matsushita/Panasonic TSU series. The "(M)" simply means it's a +/-20% capacitor, common for electrolytics. Based on the date code of the Analog Devices IC at the center right of your picture I'm...
Forum: Troubleshooting Power Supplies and Power Supply Design 08-09-2019, 05:11 PM
Replies: 8
Views: 1,519
Posted By PeteS in CA
Re: IDX camera power supply turns off after a while

If possible, replace both the harness connector (including contacts), and the PWA's connector, Chances are that the contacts on both connectors have been damaged. Or hard-wire the harness.

One of...
Forum: Troubleshooting Power Supplies and Power Supply Design 08-01-2019, 07:17 PM
Replies: 11
Views: 1,599
Posted By PeteS in CA
Re: Separated Area For +5VSB Additional Filtering

Is the noise spikes? Or something like a square wave. If it is spikes the problem might be the ground lead on your oscilloscope is acting as an antenna, picking up high frequency noise. If is like a...
Forum: General Capacitor Questions & Issues 08-01-2019, 07:12 PM
Replies: 7
Views: 284
Posted By PeteS in CA
Re: Help with Power on yamaha receiver (capacitors?)

It could be a date or source code. That capacitor is a .01uF, 5% part, probably metallized polyester film.
Forum: Troubleshooting Power Supplies and Power Supply Design 07-29-2019, 04:09 PM
Replies: 5
Views: 3,934
Posted By PeteS in CA
Re: Mac Pro PSU

Do you know that one of the 12V outputs is dropping out? With only 12V power going to the MB, that means the various logic voltages are generated by DC-DC converters on the MB. The MB is also likely...
Forum: Troubleshooting Power Supplies and Power Supply Design 07-18-2019, 07:01 PM
Replies: 1,587
Views: 326,128
Posted By PeteS in CA
Re: the gutless, bloated, and fried power supply hall of shame

What a pathetic POS (Oh, Deer?). It'd probably do 200W-250W, crappily, but it has GP ceramic Y caps. Unsafe at any power. The label rating says 400W, but even the output harness wires aren't good for...
Forum: General Capacitor Questions & Issues 07-17-2019, 11:42 AM
Replies: 13
Views: 510
Posted By PeteS in CA
Re: Capacitor(s) Identification

The larger blue cap is probably 2.2uF, 100V, either monolythic ceramic or film. If it's a film cap it's probably polyester film.

The other two are both .1uF (10 x 10^4 pF), +/-10% ("K"), film...
Forum: General Capacitor Questions & Issues 07-15-2019, 09:17 AM
Replies: 10
Views: 442
Posted By PeteS in CA
Re: Help with capacitor substitution for a DVR

Given that this is a product that users are likely to use in ways that make for poor heat dissipation and, IIRC, MCZ is a 2000-hour rated capacitor, I wonder if the slightly higher impedance of KZE,...
Forum: General Capacitor Questions & Issues 07-12-2019, 05:26 PM
Replies: 22
Views: 1,272
Posted By PeteS in CA
Re: First Timer - Mystery capacitor identification

For some reason, Nichicon likes to put "U" in front of their series names in their catalog. Just ignore; similarly, ignore the "(M)" you frequently see next to the series name on many capacitors....
Forum: General Capacitor Questions & Issues 07-10-2019, 12:03 PM
Replies: 13
Views: 510
Posted By PeteS in CA
Re: Capacitor(s) Identification

I've seen older military style mica caps that look like this:

https://www.radiomuseum.org/forumdata/users/14211/codes/sm_stamp_3.png

But not in about 50 years.
Forum: General Capacitor Questions & Issues 07-08-2019, 03:36 PM
Replies: 10
Views: 431
Posted By PeteS in CA
Re: Capacitor replacement

Boschert used a similar or that very cap for the output capacitor on their HL1500, a 5V, 300A, 1500W switching power supply. I do not know whether Boschert ever brought that model to market, though....
Forum: General Capacitor Questions & Issues 07-07-2019, 02:16 PM
Replies: 10
Views: 431
Posted By PeteS in CA
Re: Capacitor replacement

That original cap looks like a super low ESR, very high ripple current type that Sprague and maybe Mallory used to make. The ESR will be less than 10 milliohms, probably less than 5 milliohms.
...
Forum: Troubleshooting Power Supplies and Power Supply Design 07-02-2019, 12:19 PM
Replies: 18
Views: 1,181
Posted By PeteS in CA
Re: WFCO Camper Converter need help understanding KA3846 SMPS Controller

Unless you're talking about vacuum tubes, heat is pretty much never your friend in electronics. Travelling Wave Tubes are used in microwave power electronics, so not all vacuum tubes are dinosaurian...
Forum: General Capacitor Questions & Issues 07-02-2019, 12:13 PM
Replies: 9
Views: 308
Posted By PeteS in CA
Re: CHEMI-CON 4700uF AH Alternatives ?

With Chemi-Con, 85C "general purpose crap" is high grade "crap". And the 50V rating is an indicator that it was in something several decades old. All in all, you likely will be able to find a...
Forum: General Capacitor Questions & Issues 07-02-2019, 12:07 PM
Replies: 5
Views: 206
Posted By PeteS in CA
Re: Did/do manufacturers sometimes source different caps for the same product?

It's pretty typical for parts to be multiple-sourced if possible. It shields the user from spot shortages from a particular vendor. At one employer it took a Vice President's signature to approve...
Forum: General Capacitor Questions & Issues 07-02-2019, 11:57 AM
Replies: 13
Views: 510
Posted By PeteS in CA
Re: Capacitor(s) Identification

I've not seen anything like those black boxes with the colored dots, and I've been interested in electronics since high school, Nixon's first term as President.

I'm going to guess those MOVs R_J...
Forum: General Capacitor Questions & Issues 07-01-2019, 11:04 AM
Replies: 13
Views: 510
Posted By PeteS in CA
Re: Capacitor(s) Identification

The yellow discs may be Metal Oxide Varistors (MOVs). The markings are unlike what would be typical for ceramic capacitors.
Forum: Troubleshooting Power Supplies and Power Supply Design 06-28-2019, 11:20 AM
Replies: 11
Views: 516
Posted By PeteS in CA
Re: Videoton VT-110, XT clone PSU repair

1. The input electrolytics were made by Roederstein.

2. The date codes on the PWM and supervisor are 1988, "SG" being Silicon General, the creator of those ICs.

3. However, the date code on the...
Forum: Troubleshooting Power Supplies and Power Supply Design 06-26-2019, 10:48 AM
Replies: 22
Views: 564
Posted By PeteS in CA
Re: LPK12-450W safety capacitor shorted

My home town in California's Central Valley got a post office in 1861, and was incorporated in 1871. As a point of reference, California became a state in 1850. There is a section of the town with...
Showing results 1 to 25 of 500

 
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