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Search: Posts Made By: PeteS in CA
Forum: General Capacitor Questions & Issues 08-15-2019, 11:42 AM
Replies: 954
Views: 403,900
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: 89
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: 7
Views: 600
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: 753
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: 216
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: 3,881
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: 1,565
Views: 322,567
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: 396
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: 337
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: 1,100
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: 396
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: 326
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: 326
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: 13
Views: 754
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: 262
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: 172
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: 396
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: 396
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: 9
Views: 356
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: 517
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...
Forum: Troubleshooting Power Supplies and Power Supply Design 06-24-2019, 05:44 PM
Replies: 22
Views: 517
Posted By PeteS in CA
Re: LPK12-450W safety capacitor shorted

The caps you replaced are .01uF, 1KVDC parts, not suited for used as Y Caps. For safety sake I strongly recommend/urge you to use safety agency rated Y caps. Further, I think .01uF Y caps would...
Forum: General Electronics Technical Discussion 06-24-2019, 05:27 PM
Replies: 21
Views: 464
Posted By PeteS in CA
Re: Found a transformer at a thrift store and am curious...

Radio Shack speaker transformer, used to match to 16, 8, or 4 ohm speakers.
Forum: General Electronics Technical Discussion 06-24-2019, 05:22 PM
Replies: 4
Views: 186
Posted By PeteS in CA
Re: Is this a diode?

Standard recovery 1N540x would probably get toasted if a fast recovery type is necessary.

On the other hand, a UF5402 is much faster than the original part, and might generate extra noise with its...
Forum: General Capacitor Questions & Issues 06-19-2019, 03:33 PM
Replies: 21
Views: 930
Posted By PeteS in CA
Re: Nippon Chemi-Con 3300uF 10x25mm?

As has abyse, I've seen KZE in modern higher end PSUs. Rubycon ZL as well.
Forum: General Electronics Technical Discussion 06-04-2019, 05:37 PM
Replies: 11
Views: 254
Posted By PeteS in CA
Re: SMPS mains input voltage question

The 220V cap limits it to 110/120 VAC. When rectified the DC voltage will be in the 160V range. Double the input voltage, double the output voltage. If designed properly, the MOV should also be...
Showing results 1 to 25 of 500

 
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