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Search: Posts Made By: PeteS in CA
Forum: General Capacitor Questions & Issues 08-10-2022, 10:59 AM
Replies: 13
Views: 203
Posted By PeteS in CA
Re: Indentifying an old exploded cap.

That was my thinking as well.

I'd suggest staring at the PWA and drawing a schematic showing how the part was used (yes, I've done this in times past with flyback topology P/Ss, and it can be very...
Forum: General Capacitor Questions & Issues 08-10-2022, 10:54 AM
Replies: 13
Views: 412
Posted By PeteS in CA
Re: Nichicon - discontinuing many electrolytic capacitor series

Nichicon actually continues producing and selling older series for a really long time. The PM and PS series are RoHS-compliant versions of the 1980s PL and PR series (~35 years old!). The PJ series...
Forum: Troubleshooting Power Supplies and Power Supply Design 08-04-2022, 11:10 AM
Replies: 35
Views: 8,060
Posted By PeteS in CA
Re: Corsair CX400W 5vsb goes into safety loop

The outer surface of an MLCC is a protective insulator.

Non-polymer-termination MLCCs don't like PCB flexure, the larger sizes (>0805) especially.
Forum: General Electronics Technical Discussion 08-04-2022, 11:02 AM
Replies: 2
Views: 107
Posted By PeteS in CA
Re: Identify component UBR 4.2 D

Can't find anything via DDG, but I'm going to guess that those are rectifiers, possibly Schottky rectifiers.
Forum: General Capacitor Questions & Issues 08-04-2022, 10:50 AM
Replies: 10
Views: 304
Posted By PeteS in CA
Re: solid polymer electrolytic capacitor go boom?

Since in both polymer and liquid electrolyte capacitors the dielectric is aluminum oxide, not the polymer or liquid electrolyte, are the frequency characteristics for the two types substantially...
Forum: General Capacitor Questions & Issues 07-31-2022, 04:05 PM
Replies: 13
Views: 412
Posted By PeteS in CA
Re: Nichicon - discontinuing many electrolytic capacitor series

Unless I’m misunderstanding that chart, it looks like selected case sizes and/or voltages are being discontinued rather than entire series. The PM/PL series has been around since the late 1980s, and...
Forum: General Capacitor Questions & Issues 07-27-2022, 01:01 PM
Replies: 10
Views: 304
Posted By PeteS in CA
Re: solid polymer electrolytic capacitor go boom?

Polymers don't have a liquid electrolyte that could cause venting or evaporate.
Forum: General Capacitor Questions & Issues 07-26-2022, 02:36 PM
Replies: 10
Views: 304
Posted By PeteS in CA
Re: solid polymer electrolytic capacitor go boom?

I recently saw a polymer cap that had been installed reverse polarity. But for being inside the P/S case it would have launched. The case limited the height the cap attained.

About 15 years ago...
Forum: Troubleshooting Power Supplies and Power Supply Design 07-05-2022, 11:44 AM
Replies: 4
Views: 219
Posted By PeteS in CA
Re: iMac A1311 PSU repair questions

DMM diode checkers source around 2V, which is too low to turn on a MOSFET. Depending on the type, MOSFETs need ~3V (for logic level types) to ~5V, Gate-to-Source, to start to turn on, and even then...
Forum: Troubleshooting Power Supplies and Power Supply Design 07-05-2022, 11:34 AM
Replies: 14
Views: 396
Posted By PeteS in CA
Re: Delta DPS-150GB PSU failure

I doubt that the caps used in that P/S were as low impedance as KY or KZE. LXV, PS (= PR), LXZ, or PW would probably do well for both output caps and smaller value decoupling and start-up caps.
...
Forum: General Capacitor Questions & Issues 06-29-2022, 03:13 PM
Replies: 9
Views: 363
Posted By PeteS in CA
Re: 3300F 450V caps...

Maybe you could use them as hand weights for weight training?
Forum: Troubleshooting Power Supplies and Power Supply Design 06-21-2022, 12:42 PM
Replies: 38
Views: 6,217
Posted By PeteS in CA
Re: WFCO Camper Converter need help understanding KA3846 SMPS Controller

The history I gave of Fairchild and its purchase of rights to some of Samsung's linear ICs had no lawsuit in it that I'm aware of. Fairchild had been spun back out of Nat Semi, and bought parts from...
Forum: General Capacitor Questions & Issues 06-13-2022, 12:06 PM
Replies: 5
Views: 423
Posted By PeteS in CA
Re: Identifying capacitor type (Laserdisc PSU)

The brownish cap is between a heatsink and a power transformer, both sources of heat, and possibly impeding airflow or convection, and as redwire noted, there are two 1 watt resistors near the cap.
...
Forum: Troubleshooting Power Supplies and Power Supply Design 06-10-2022, 07:30 AM
Replies: 1,725
Views: 480,227
Posted By PeteS in CA
Re: the gutless, bloated, and fried power supply hall of shame

The model number suggests it's a 200W/150W power supply (or maybe the PCB is used for 150W and 200W models). Anyway, the 220uF input caps are about right for 150W. Based on possible clues in the S/N...
Forum: Troubleshooting Power Supplies and Power Supply Design 06-07-2022, 03:04 PM
Replies: 38
Views: 6,217
Posted By PeteS in CA
Re: WFCO Camper Converter need help understanding KA3846 SMPS Controller

Wellllll ... KA3846 is a Samsung part number. Samsung sold the rights to a bunch of their linear parts to Fairchild when Fairchild was spun back out from National Semiconductor. Fairchild was later...
Forum: Troubleshooting Power Supplies and Power Supply Design 06-06-2022, 12:01 PM
Replies: 38
Views: 6,217
Posted By PeteS in CA
Re: WFCO Camper Converter need help understanding KA3846 SMPS Controller

The UC3846 is part of the same PWM family as the ubiquitous 3842/3/4/5. The 3846/7 is usable with half and full bridge inverters. TI is the current mfr, and it looks like Mouser and Digikey carry the...
Forum: Troubleshooting Power Supplies and Power Supply Design 06-03-2022, 12:22 PM
Replies: 22
Views: 556
Posted By PeteS in CA
Re: Apple 85W MagSafe Power Adapter - blown - help with component identification

My compliments for the clear pictures.

The first two characters on the fried resistor appear to be "R" and "1". The third character could be "0", "8", or "9". I'm guessing this resistor is in the...
Forum: General Electronics Technical Discussion 05-30-2022, 09:37 AM
Replies: 13
Views: 453
Posted By PeteS in CA
Re: Ohms Law question - kind of ...

IOW, the battery has an internal resistance which would drop some of the battery's voltage if connected to a .15 ohm load (ignoring the inductance and charge time of the inductance).
Forum: General Electronics Technical Discussion 05-27-2022, 04:04 PM
Replies: 10
Views: 400
Posted By PeteS in CA
Re: Component identification

Is it an X capacitor or a Y capacitor. IIRC, Rifa made a .022uF Y capacitor in the PME271 series.
Forum: General Capacitor Questions & Issues 05-16-2022, 12:41 PM
Replies: 357
Views: 494,893
Posted By PeteS in CA
Re: List of Bad Cap Manufacturers

Yep, those caps are preggers and not going to deliver anything good. FWIW, the date on the PWA is February 2012.
Forum: General Capacitor Questions & Issues 05-16-2022, 12:37 PM
Replies: 9
Views: 593
Posted By PeteS in CA
Re: ESR 0.6Ω capacitance -15% absolute must change?

As best I can tell, the PIC16F819 is a general purpose microcontroller, https://ww1.microchip.com/downloads/en/DeviceDoc/39598F.pdf . Perhaps it is being used as a supervisor.

Your 5VSB is...
Forum: General Electronics Technical Discussion 05-13-2022, 12:28 PM
Replies: 39
Views: 1,973
Posted By PeteS in CA
Re: TIP120 Question

Back in the late 70s and into the 80s, transistors were used rather than Darlingtons. At Boschert, we used 2N654# and MJE1300# transistors (TO-204 and TO-220, respectively) from Motorola. That was...
Forum: General Electronics Technical Discussion 05-13-2022, 12:06 PM
Replies: 39
Views: 1,973
Posted By PeteS in CA
Re: TIP120 Question

In addition to limiting the realistic maximum switch frequency, during those turn-on and turn-off times, the device is in its linear reason, i.e. dissipating power. As those turn-on and turn-off...
Forum: General Electronics Technical Discussion 05-12-2022, 11:44 AM
Replies: 39
Views: 1,973
Posted By PeteS in CA
Re: TIP120 Question

redwire is correct that I was confusing a C-B resistor with a Baker Clamp, which uses a diode to reduce storage time. Lo siento.

Basically, transistors' rise, fall, and storage time combine to...
Forum: Troubleshooting Power Supplies and Power Supply Design 05-08-2022, 06:16 PM
Replies: 12
Views: 608
Posted By PeteS in CA
Re: Power Man ip-p300bn7-2 blown

Putting together anecdotal comments I’ve seen around here, I wonder if a lot of the snap-in type caps, which were originally designed for 50/60 Hz usage, are not suitable for the high frequency...
Showing results 1 to 25 of 500

 
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