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Search: Posts Made By: Rulycat
Forum: Troubleshooting Power Supplies and Power Supply Design 05-13-2020, 03:41 PM
Replies: 7
Views: 404
Posted By Rulycat
Re: Making transformers

That's a good recommendation, I have bought a used copy online, and have downloaded a hookie copy until the doorstopper comes.

Doing a quick scan through and it seems already more digestible than...
Forum: Troubleshooting Power Supplies and Power Supply Design 05-05-2020, 01:03 PM
Replies: 7
Views: 404
Posted By Rulycat
Re: Making transformers

Th3_uN1Qu3, that's a fantastic document. I must have read on here years ago, but it was so long ago, it slipped my mind.

I'm not professionally educated in this field at all so some of the...
Forum: Troubleshooting Power Supplies and Power Supply Design 05-03-2020, 06:25 AM
Replies: 7
Views: 404
Posted By Rulycat
Re: Making transformers

Looks good, I was struggling with where to get materials for a transformer as well like the core... as I don't have any PSUs lying around to cannibalise...
Forum: General Electronics Technical Discussion 05-01-2020, 06:55 PM
Replies: 5
Views: 395
Posted By Rulycat
Re: I need a basic BIOS circuit

Is it a common BIOS chip like the attached picture? Are you trying to work out how the CR2032 powers the chip?
Forum: Troubleshooting Power Supplies and Power Supply Design 05-01-2020, 06:36 PM
Replies: 7
Views: 404
Posted By Rulycat
Making transformers

During lockdown I decided to do more research on power supply theory, take this image for example:

http://www.pavouk.org/hw/en_atxps.html

This is the DTK 200w schematic that seems common on the...
Forum: Troubleshooting Power Supplies and Power Supply Design 11-06-2018, 09:14 AM
Replies: 15
Views: 697
Posted By Rulycat
Re: Auto XS car battery charger how good is this charger

What are the temps like, could it be overheating if the magnet is used more often?
Forum: General Electronics Technical Discussion 10-30-2018, 02:50 PM
Replies: 23
Views: 1,030
Posted By Rulycat
Re: What are these battries ?

Poundland sell 2 x 800mAh AAs. Penny pinching where you can't see it.
Forum: Troubleshooting Power Supplies and Power Supply Design 10-22-2018, 01:55 PM
Replies: 15
Views: 1,043
Posted By Rulycat
Re: "Magna" 300W ATX PSU (bad workmanship inside)

If they are identical it would be logical you could swap them... no?
Forum: Troubleshooting Power Supplies and Power Supply Design 10-22-2018, 02:29 AM
Replies: 15
Views: 1,043
Posted By Rulycat
Re: "Magna" 300W ATX PSU (bad workmanship inside)

OK, so I should probably work out how the transformer is wound and which pins go where before doing anything again. I'll probably cut this one in half to see how it goes together.
Forum: Troubleshooting Power Supplies and Power Supply Design 10-20-2018, 04:56 AM
Replies: 15
Views: 1,043
Posted By Rulycat
Re: "Magna" 300W ATX PSU (bad workmanship inside)

That would be a good idea everell. Any ideas why the "new" transformer doesn't play nicely with the unit?
Forum: General Electronics Technical Discussion 10-14-2018, 03:12 PM
Replies: 47
Views: 1,950
Posted By Rulycat
Re: eBay Chinese Electronic Clock Kit

Could I use the NPN tester in my multimeter to test it?
Forum: Troubleshooting Power Supplies and Power Supply Design 10-14-2018, 03:11 PM
Replies: 15
Views: 1,043
Posted By Rulycat
Re: "Magna" 300W ATX PSU (bad workmanship inside)

Doly noted stj :)

I replaced with a 35 size transformer as in the images attached - and used electrical tape to separate from the heatsinks (as I assumed it's not a good idea if those make...
Forum: General Electronics Technical Discussion 10-14-2018, 11:19 AM
Replies: 47
Views: 1,950
Posted By Rulycat
Re: eBay Chinese Electronic Clock Kit

It's working! Didn't have to short the 7805.

You'll notice I replaced the cap there as well.

Does this mean the transistor isn't cooked?

Haven't installed the switch yet.
Forum: Troubleshooting Power Supplies and Power Supply Design 10-14-2018, 10:33 AM
Replies: 15
Views: 1,043
Posted By Rulycat
"Magna" 300W ATX PSU (bad workmanship inside)

Here is a Magna 300W ATX PSU, with plenty of bloated JEE and other caps:

Primaries are HEC 330uf 200V (will change these when I get some other caps)

Now I said on the other thread about the...
Forum: General Electronics Technical Discussion 10-10-2018, 09:03 AM
Replies: 47
Views: 1,950
Posted By Rulycat
Re: eBay Chinese Electronic Clock Kit

Sorry gents will do this just waiting on the 3xaa battery box to arrive.
Forum: General Electronics Technical Discussion 10-09-2018, 04:10 AM
Replies: 47
Views: 1,950
Posted By Rulycat
So should I remove any components? Or just feed...

So should I remove any components? Or just feed to the usual screw input with 3 x AAs?
Forum: General Electronics Technical Discussion 10-08-2018, 04:20 PM
Replies: 47
Views: 1,950
Posted By Rulycat
Re: eBay Chinese Electronic Clock Kit

Pete

Still waiting on a replacement cap.
Forum: General Electronics Technical Discussion 10-07-2018, 03:42 PM
Replies: 5
Views: 894
Posted By Rulycat
Forum: General Electronics Technical Discussion 10-07-2018, 03:41 PM
Replies: 47
Views: 1,950
Posted By Rulycat
Re: eBay Chinese Electronic Clock Kit

Yes it only has one band, but it came in the same strip as the others, so I think it is just a printing error.

Tbh I hoped I could just solder it all and it'd work
Forum: General Electronics Technical Discussion 10-06-2018, 03:45 PM
Replies: 47
Views: 1,950
Posted By Rulycat
Re: eBay Chinese Electronic Clock Kit

Got some crap caps at my dads house so for the sake of 2 lets see if anything else is goosed and if not then I'll put proper caps on it.
Forum: General Electronics Technical Discussion 10-06-2018, 03:32 PM
Replies: 47
Views: 1,950
Posted By Rulycat
Re: eBay Chinese Electronic Clock Kit

For the cost of it I should just order another and chalk it up to stupidity.
Forum: General Electronics Technical Discussion 10-06-2018, 03:25 PM
Replies: 5
Views: 894
Posted By Rulycat
Where to get cheap electronics books

So if you get new tech books from e.g Amazon you are looking at 15+ per book

I already have some such as switching pwoer supplies a-z (but most of that goes over my head) and also an old 80's...
Forum: General Electronics Technical Discussion 10-06-2018, 03:24 PM
Replies: 47
Views: 1,950
Posted By Rulycat
Re: eBay Chinese Electronic Clock Kit

Looks like I am reading the PSU backwards then... which means white line is +VE!!! That will be why cap has blown!!

D'oh!!! :facepalm::facepalm:
Forum: General Electronics Technical Discussion 10-06-2018, 03:07 PM
Replies: 47
Views: 1,950
Posted By Rulycat
Re: eBay Chinese Electronic Clock Kit

This is how my multimeter is wired... the black connector (negative) I am putting against the wire with the white strip down it on the PSU... it reads 8.88V which seems about right.
Forum: General Electronics Technical Discussion 10-06-2018, 03:06 PM
Replies: 11
Views: 960
Posted By Rulycat
Re: Standard UK sockets

Most of the cheapo Poundland stuff just uses a few aluminium strips for the conductors... and they're really thin!!!
Showing results 1 to 25 of 371

 
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