Forum: General Capacitor Questions & Issues
06-29-2022, 03:13 PM
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Replies: 9
Views: 174
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Forum: General Capacitor Questions & Issues
06-13-2022, 12:06 PM
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Replies: 5
Views: 260
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: 468,883
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Forum: General Electronics Technical Discussion
05-30-2022, 09:37 AM
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Replies: 13
Views: 332
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: 314
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Forum: General Capacitor Questions & Issues
05-16-2022, 12:41 PM
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Replies: 356
Views: 481,310
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Forum: General Capacitor Questions & Issues
05-16-2022, 12:37 PM
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Replies: 9
Views: 468
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Forum: General Electronics Technical Discussion
05-13-2022, 12:28 PM
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Replies: 39
Views: 1,507
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: 1,507
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: 1,507
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: 519
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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Forum: General Electronics Technical Discussion
05-06-2022, 11:40 AM
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Replies: 39
Views: 1,507
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...
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Forum: General Capacitor Questions & Issues
05-06-2022, 11:28 AM
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Replies: 9
Views: 468
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Forum: General Capacitor Questions & Issues
05-05-2022, 06:20 PM
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Replies: 9
Views: 468
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Forum: General Capacitor Questions & Issues
05-04-2022, 04:40 PM
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Replies: 9
Views: 468
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Forum: General Capacitor Questions & Issues
05-04-2022, 04:22 PM
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Replies: 18
Views: 494
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Forum: General Capacitor Questions & Issues
05-02-2022, 11:17 AM
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Replies: 18
Views: 494
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Forum: General Capacitor Questions & Issues
05-02-2022, 11:13 AM
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Replies: 18
Views: 494
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Forum: General Electronics Technical Discussion
05-01-2022, 06:00 PM
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Replies: 12
Views: 468
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Forum: General Capacitor Questions & Issues
05-01-2022, 05:48 PM
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Replies: 18
Views: 494
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Forum: General Electronics Technical Discussion
04-29-2022, 10:58 AM
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Replies: 12
Views: 468
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