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Search: Posts Made By: PeteS in CA
Forum: General Capacitor Questions & Issues 06-29-2022, 03:13 PM
Replies: 9
Views: 198
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: 5,920
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: 268
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: 469,451
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: 5,920
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: 5,920
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: 407
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: 338
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: 316
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: 356
Views: 485,089
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: 471
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: 1,522
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: 1,522
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: 1,522
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: 526
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...
Forum: General Electronics Technical Discussion 05-06-2022, 11:40 AM
Replies: 39
Views: 1,522
Posted By PeteS in CA
Re: TIP120 Question

I sit partially corrected about the TIP120 incorporating B-E resistors. However I think those are to prevent leakage or noise from turning on the Darlington. IIRC, it's a C-B resistor that keeps a...
Forum: General Capacitor Questions & Issues 05-06-2022, 11:28 AM
Replies: 9
Views: 471
Posted By PeteS in CA
Re: ESR 0.6Ω capacitance -15% absolute must change?

I should have done this earlier ... here's a pic of one of the 3 modules in a PWS-0050:
...
Forum: General Capacitor Questions & Issues 05-05-2022, 06:20 PM
Replies: 9
Views: 471
Posted By PeteS in CA
Re: ESR 0.6Ω capacitance -15% absolute must change?

So the PFC appears to be working. That plus the 5VSB means your auxiliary regulator is working.

Do you have that 383V at the inverter MOSFET Drain? If not, you may have an open fuse between the...
Forum: General Capacitor Questions & Issues 05-04-2022, 04:40 PM
Replies: 9
Views: 471
Posted By PeteS in CA
Re: ESR 0.6Ω capacitance -15% absolute must change?

That model is end-of-life.

The capacitance is in spec, for +/-20% tolerance. I'm not sure the ESR you measured is abnormal for a 100uF, 400V electrolytic capacitor. It's hard to compare to catalog...
Forum: General Capacitor Questions & Issues 05-04-2022, 04:22 PM
Replies: 18
Views: 498
Posted By PeteS in CA
Re: What damage can occur when a filter cap explodes?

Actually, I do remember a lytic launch. I was working at Boschert, and a new engineering tech was working on a 48V input DC-DC converter prototype. The assembler had accidentally installed a 7.5V cap...
Forum: General Capacitor Questions & Issues 05-02-2022, 11:17 AM
Replies: 18
Views: 498
Posted By PeteS in CA
Re: What damage can occur when a filter cap explodes?

I haven't heard any lytics going off that dramatically, but my experience is, obviously, finite. OTOH, when a wet slug tantalum went of a couple of feet from me my ears were ringing for an hour or...
Forum: General Capacitor Questions & Issues 05-02-2022, 11:13 AM
Replies: 18
Views: 498
Posted By PeteS in CA
Forum: General Electronics Technical Discussion 05-01-2022, 06:00 PM
Replies: 12
Views: 473
Posted By PeteS in CA
Re: FCL30A015 diode reverse biased shows 35 Ohm, 0.05V forward. Is it gone?

Its more likely to be made by Compuware, Delta, or Samsung.
Forum: General Capacitor Questions & Issues 05-01-2022, 05:48 PM
Replies: 18
Views: 498
Posted By PeteS in CA
Re: What damage can occur when a filter cap explodes?

If it’s an electrolytic, the liquid electrolyte is very conductive and could cause shorts.
Forum: General Electronics Technical Discussion 04-29-2022, 10:58 AM
Replies: 12
Views: 473
Posted By PeteS in CA
Re: FCL30A015 diode reverse biased shows 35 Ohm, 0.05V forward. Is it gone?

That's a 30A, 15V Schottky. It has a very low forward drop, possibly for use as a high current or'ing rectifier. Its normal characteristics could "fool" a DMM diode checker. I'd suggest doing an...
Showing results 1 to 25 of 500

 
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