Forum: General Capacitor Questions & Issues
08-10-2022, 10:59 AM
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Replies: 13
Views: 176
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...
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Forum: General Capacitor Questions & Issues
08-10-2022, 10:54 AM
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Replies: 13
Views: 406
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Forum: General Electronics Technical Discussion
08-04-2022, 11:02 AM
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Replies: 2
Views: 97
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Forum: General Capacitor Questions & Issues
08-04-2022, 10:50 AM
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Replies: 10
Views: 297
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...
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Forum: General Capacitor Questions & Issues
07-31-2022, 04:05 PM
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Replies: 13
Views: 406
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Forum: General Capacitor Questions & Issues
07-27-2022, 01:01 PM
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Replies: 10
Views: 297
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Forum: General Capacitor Questions & Issues
07-26-2022, 02:36 PM
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Replies: 10
Views: 297
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...
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Forum: Troubleshooting Power Supplies and Power Supply Design
07-05-2022, 11:44 AM
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Replies: 4
Views: 216
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...
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Forum: Troubleshooting Power Supplies and Power Supply Design
07-05-2022, 11:34 AM
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Replies: 14
Views: 390
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.
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Forum: General Capacitor Questions & Issues
06-29-2022, 03:13 PM
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Replies: 9
Views: 356
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Forum: General Capacitor Questions & Issues
06-13-2022, 12:06 PM
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Replies: 5
Views: 420
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.
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Forum: Troubleshooting Power Supplies and Power Supply Design
06-10-2022, 07:30 AM
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Replies: 1,725
Views: 480,007
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Forum: General Electronics Technical Discussion
05-30-2022, 09:37 AM
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Replies: 13
Views: 452
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).
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Forum: General Electronics Technical Discussion
05-27-2022, 04:04 PM
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Replies: 10
Views: 397
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Forum: General Capacitor Questions & Issues
05-16-2022, 12:41 PM
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Replies: 357
Views: 494,723
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Forum: General Capacitor Questions & Issues
05-16-2022, 12:37 PM
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Replies: 9
Views: 593
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Forum: General Electronics Technical Discussion
05-13-2022, 12:28 PM
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Replies: 39
Views: 1,960
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...
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Forum: General Electronics Technical Discussion
05-13-2022, 12:06 PM
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Replies: 39
Views: 1,960
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...
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Forum: General Electronics Technical Discussion
05-12-2022, 11:44 AM
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Replies: 39
Views: 1,960
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...
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Forum: Troubleshooting Power Supplies and Power Supply Design
05-08-2022, 06:16 PM
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Replies: 12
Views: 606
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...
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