Forum: Troubleshooting Power Supplies and Power Supply Design
05-15-2022, 03:14 AM
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Replies: 22
Views: 2,001
Re: Dell 2700w j728n 3kVa UPS not starting
One way of simulating UPS packs I thought of at one point, though this is both dangerous and possibly expensive if you don't have one, is to use a variac with a bridge rectifier. Of course, you...
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Forum: General Electronics Technical Discussion
05-14-2022, 05:39 AM
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Replies: 35
Views: 544
Re: Line filter question
I did some tests today: I took a power transformer that outputs 24VAC, enough to power my soldering iron through a bridge rectifier and DC-DC converter to limit it to 24v and measured ACV between the...
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Forum: General Electronics Technical Discussion
05-13-2022, 12:03 PM
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Replies: 35
Views: 544
Re: Line filter question
Can't remember right now how TV power supplies without the third PE conductor are arranged (double insulated). I've worked on quite a few of them over the years, but can't recall the arrangement of...
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Forum: General Electronics Technical Discussion
05-12-2022, 10:44 AM
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Replies: 35
Views: 544
Re: Line filter question
Yeah, I'm not gonna mess around (too much) with the electrical wiring in my home/shop. I was mostly interested in how to design a proper power supply that's safe to install on lab equipment which...
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Forum: General Electronics Technical Discussion
05-10-2022, 11:41 AM
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Replies: 35
Views: 544
Re: Line filter question
Yeah, those are what I'm talking about - pretty pricey though, at least where I live. Here's...
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Forum: General Electronics Technical Discussion
05-10-2022, 10:55 AM
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Replies: 35
Views: 544
Re: Line filter question
Funnily enough, there DO seem to exist line filters without the Y caps between PE and L/N already built into them, like these...
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Forum: General Electronics Technical Discussion
05-09-2022, 02:05 PM
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Replies: 35
Views: 544
Re: Line filter question
Well, I haven't done anything yet, hence this discussion :D
Yes, my apartment is in a pretty old building, but there are no pipes close to my workbench anyway, so it's not an option.
Out of...
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Forum: General Electronics Technical Discussion
05-09-2022, 07:38 AM
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Replies: 35
Views: 544
Re: Line filter question
There aren't any pipes that are easy to run wires to anyway, hence why I suggested I should just use the TN-C method in each outlet. The only danger I see with this is if someone, for some reason...
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Forum: General Electronics Technical Discussion
05-08-2022, 02:11 PM
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Replies: 35
Views: 544
Re: Line filter question
I'm mostly interested in protecting the stuff I work on if it gets connected to this power supply or if it powers a soldering iron. I haven't had any mishaps with the first supply I built using a DPS...
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Forum: General Electronics Technical Discussion
05-08-2022, 01:20 PM
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Replies: 35
Views: 544
Re: Line filter question
I can't do that in this case, since the caps are inside the metal shell and I DO want a connection to earth just in case there IS one there. I think I can use an IEC connector and just omit those...
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Forum: General Electronics Technical Discussion
05-08-2022, 09:35 AM
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Replies: 35
Views: 544
Re: Line filter question
I know what it does, I was just curious how such a setup would behave when the earth pin (PE) is floating. It's not just my apartment - I could carry this supply someplace else and I may face the...
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Forum: General Electronics Technical Discussion
05-08-2022, 04:31 AM
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Replies: 35
Views: 544
Line filter question
Good day folks. A while back, I started building a bench power supply (long story - see it here (https://www.badcaps.net/forum/showthread.php?t=76581&highlight=dual&page=7) :D). I noticed something...
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Forum: General Electronics Technical Discussion
04-20-2022, 11:14 AM
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Replies: 11
Views: 399
Re: Using car key fob as generic remote control
There isn't anything else on the PCB, as you can see in the pic I showed (the other side only has the battery), hence why I think the PCF chip in the fob handles the immobilizer too...
That's not...
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Forum: General Electronics Technical Discussion
04-20-2022, 02:57 AM
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Replies: 11
Views: 399
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Forum: General Electronics Technical Discussion
04-19-2022, 02:33 PM
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Replies: 11
Views: 399
Re: Using car key fob as generic remote control
Ok, good to know - that's why I said "inferred" :D. What threw me off is the antenna coil in the datasheet for the PCF chip, connected to the "IN" pins on the left - apparently those receive...
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Forum: General Electronics Technical Discussion
04-19-2022, 02:10 PM
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Replies: 11
Views: 399
Re: Using car key fob as generic remote control
After doing some more reading, I learned (or rather inferred) some more about this particular PCF (https://pdf1.alldatasheet.com/datasheet-pdf/view/1132654/PHILIPS/PCF7946AT.html) chip, despite the...
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Forum: General Electronics Technical Discussion
04-19-2022, 01:41 AM
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Replies: 11
Views: 399
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Forum: General Electronics Technical Discussion
04-18-2022, 02:17 PM
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Replies: 11
Views: 399
Using car key fob as generic remote control
Good day folks. It's been a while since I've DIY-d anything, so the other day I was thinking if it's possible to use the key fob of my car as a remote for other automation stuff. I have quite a few...
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Forum: Troubleshooting Laptops, Tablets, and Mobile Devices
04-04-2022, 01:33 AM
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Replies: 68
Views: 15,465
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Forum: Troubleshooting Audio Equipment
03-25-2022, 07:53 AM
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Replies: 12
Views: 2,231
Re: Electric piano distorted notes (Roland RD100)
Ok guys, after a ridiculous amount of time, today I decided to crack open the piano to have a look inside. As you can see, the damage done by my "skilled" co-worker (who thankfully retired in the...
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Forum: Troubleshooting Power Supplies and Power Supply Design
03-16-2022, 12:18 AM
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Replies: 8
Views: 376
Re: Panasonic PBX shuts off at random
Not much I could do with it myself, plus I don't imagine it's doing any major work when in operation anyway, so I just let it run on my desk however it pleased. It doesn't matter in this case,...
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Forum: Troubleshooting Power Supplies and Power Supply Design
03-14-2022, 01:44 AM
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Replies: 8
Views: 376
Re: Panasonic PBX shuts off at random
Here's the situation: I left the PBX running on my desk on Friday over the weekend and when I came back to it this Monday morning it was dead again, with the same symptoms: no 15v output and only a...
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Forum: Troubleshooting Power Supplies and Power Supply Design
03-13-2022, 05:11 AM
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Replies: 8
Views: 376
Re: Panasonic PBX shuts off at random
I already replaced those, which leads me to this:
Yes, it is - up to Q15, so point 19 gives me the correct voltage all the time. Point 20 doesn't.
Yes, that's what I'm expecting, but point...
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