Forum: General Electronics Technical Discussion
05-17-2022, 09:53 AM
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Replies: 5
Views: 103
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Forum: General Electronics Technical Discussion
05-16-2022, 11:27 PM
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Replies: 5
Views: 103
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Forum: Troubleshooting Audio Equipment
05-16-2022, 09:47 AM
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Replies: 6
Views: 253
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Forum: General Electronics Technical Discussion
05-14-2022, 06:42 PM
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Replies: 5
Views: 103
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Forum: General Electronics Technical Discussion
05-12-2022, 07:21 PM
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Replies: 35
Views: 516
Re: Line filter question
Indeed the key thing is insulation - the only way you can get devices with only 2 prongs is that it's completely plastic on the outside for insulation as well as full isolation from the internal...
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Forum: General Electronics Technical Discussion
05-12-2022, 07:06 PM
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Replies: 39
Views: 971
Re: TIP120 Question
IRF620 is only around 10x faster than the TIP120 :)
BTW, this is specific to Darlingtons. I'm pretty sure you can build custom BJT circuits faster than off the shell Darlingtons, after all people...
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Forum: General Electronics Technical Discussion
05-11-2022, 03:12 PM
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Replies: 35
Views: 516
Re: Line filter question
op should just leave pe open and not modify the caps or internal wiring, and use a GFCI/RCD for safety. Not ideal but should not result in a fried Dannyx.
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Forum: General Electronics Technical Discussion
05-11-2022, 10:30 AM
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Replies: 35
Views: 516
Re: Line filter question
Right, it runs hot as it will dump heat (yes, they are underspecced for 100% duty cycle) but they do serve a function that a simple resistor can't do...
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Forum: General Electronics Technical Discussion
05-10-2022, 03:49 PM
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Replies: 35
Views: 516
Re: Line filter question
Not sure why bigclive dissed so much on the transistor current regulator... it will detect those 50V differences where a neon lamp will miss...
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Forum: General Electronics Technical Discussion
05-10-2022, 02:15 PM
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Replies: 6
Views: 162
Re: RF 3 way switch
I don't completely fault ebay other than the exorbitant fees they charge sellers, but there are definitely some sellers that use ebay trying to make a quick buck by exaggerating the description...
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Forum: Troubleshooting Game Consoles & Other Weird Devices
05-09-2022, 12:51 PM
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Replies: 106
Views: 18,429
Re: Post your worthless and/or pointless repairs
No, not pointless or worthless at all, you saved it from the landfill (unless you paid more for the switch than buying a new heat gun... then it would indeed qualify)!
However... definitely...
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Forum: General Electronics Technical Discussion
05-08-2022, 01:59 PM
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Replies: 35
Views: 516
Re: Line filter question
Yes you will get a little current through the ground Y capacitors when floating but by design it should not be enough to electrocute. Just leave it and yes you should ground it, but as long as...
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Forum: General Electronics Technical Discussion
05-07-2022, 11:29 PM
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Replies: 39
Views: 971
Re: TIP120 Question
Compare a TIP120 C-E drop with an IRF620 D-S drop at 5A load ... :D
Yes these things are slow but there have been plenty of SMPS with BJTs, though I can't say, other than the MC34063, many...
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Forum: General Electronics Technical Discussion
05-07-2022, 11:54 AM
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Replies: 6
Views: 244
Re: Resistor value - color coding
Perhaps key observation: if you have a metallic band and it seems to be first or second band... need to flip the resistor around and try again!
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Forum: Troubleshooting Audio Equipment
05-04-2022, 09:19 AM
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Replies: 6
Views: 253
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Forum: General Electronics Technical Discussion
04-28-2022, 02:11 PM
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Replies: 12
Views: 322
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Forum: General Electronics Technical Discussion
04-28-2022, 07:11 AM
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Replies: 10
Views: 232
Re: Motorcycle flasher mystery.
No
The aspect that it's a diode is inconsequential, the fact that it's an LED that's 4 to 10x more efficient at generating light is the key factor.
Do not go get a pair of 21W super bright LED...
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Forum: Troubleshooting Power Supplies and Power Supply Design
04-26-2022, 09:57 PM
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Replies: 6
Views: 215
Re: UC384x critical cap
FSCK. Nope, was wrong, the 47µF capacitor was not the critical cap for the UC384x, it's for the 2T standby PSU... So agreed I don't think I can much with the value that much, ugh.... need to locate...
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Forum: General Electronics Technical Discussion
04-26-2022, 05:46 PM
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Replies: 39
Views: 971
Re: TIP120 Question
Refill every after customer? They should only be able to open it if it's their turn...
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Forum: General Computer & Tech Discussion
04-25-2022, 07:40 PM
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Replies: 55
Views: 8,371
Re: <play taps>RadeonHD 5770 dead at ... ~10?
LOL yup, this R7-250 I can get to 65°C under load where the V3900 gets to only 50°C. Now...what to do to get the R7-250 to last longer... and yes this thing indeed is noticeably faster than the...
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Forum: General Computer & Tech Discussion
04-25-2022, 05:07 PM
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Replies: 55
Views: 8,371
Re: <play taps>RadeonHD 5770 dead at ... ~10?
Hmm... "new" in the collection: A Radeon R7 250. Now this may start to get up to the speed of the HD 5770. Or not? Testing will tell, once I get the drivers squared away...
I suspect this board...
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