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Search: Posts Made By: eccerr0r
Forum: General Electronics Technical Discussion Today, 02:05 AM
Replies: 87
Views: 632
Posted By eccerr0r
Re: Fixing a laboratory waterbath

disconnect it and see if it goes away?
Can't assume, need to check.
Forum: General Electronics Technical Discussion Yesterday, 07:25 PM
Replies: 1
Views: 26
Posted By eccerr0r
Re: Help Salvaging Speakers from LCD Monitor

I've found the speakers on pretty much all monitors suck...

Anyway, take a better photograph of the lower left hand corner with the audio circuitry, you'll have to either override power to the...
Forum: General Electronics Technical Discussion Yesterday, 03:10 PM
Replies: 87
Views: 632
Posted By eccerr0r
Re: Fixing a laboratory waterbath

Never bypass fuses, they are there for a reason. It should have also helped protect that trace that blew in the first place, I still don't know what's the story behind that.

Supposedly this...
Forum: General Electronics Technical Discussion 06-12-2021, 07:40 PM
Replies: 87
Views: 632
Posted By eccerr0r
Re: Fixing a laboratory waterbath

Make sure the knob pot is still connected properly, measure the voltage between the center wiper and one of the side terminals as you change it - does it also change? Linearly throughout the range?...
Forum: General Electronics Technical Discussion 06-12-2021, 05:45 PM
Replies: 87
Views: 632
Posted By eccerr0r
Re: Fixing a laboratory waterbath

Lots of mishmash responses here:
AC has no polarity per se - but does have a phase. If even the phase doesn't matter then you can connect it any way you want. If phase does matter, then you can't....
Forum: General Electronics Technical Discussion 06-12-2021, 12:49 PM
Replies: 87
Views: 632
Posted By eccerr0r
Re: Fixing a laboratory waterbath

The dot polarity does matter but for your case it shouldn't. Does the transformer actually indicate which one is the dot?

You probably should use the 7.8V output for the 8V output instead of the...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 06-11-2021, 11:25 PM
Replies: 1
Views: 154
Posted By eccerr0r
Re: 3d printed electronics bench accessories and equipment

TBH I've not really printed much for myself, think the only jewel I made with my 3d printer is the fix for my electric knife that was in the "Pointless Repairs" thread.

Another silly thing that I...
Forum: General Electronics Technical Discussion 06-10-2021, 07:40 PM
Replies: 3
Views: 76
Posted By eccerr0r
Re: ECH81/6AJ8 Vacuum Tube Question

The Seco 1100 is an emissivity only tester, so it doesn't do very much for gain. So it might not completely test the tube. So it still could be weak. That ECH81/6AJ8 is not completely used in FM...
Forum: General Electronics Technical Discussion 06-10-2021, 05:41 PM
Replies: 87
Views: 632
Posted By eccerr0r
Re: Fixing a laboratory waterbath

Physical size(and price) is the main problem.
Forum: General Electronics Technical Discussion 06-10-2021, 04:53 PM
Replies: 87
Views: 632
Posted By eccerr0r
Re: Fixing a laboratory waterbath

Looks like the original is at least "20VA" or so, was staring at one of the spare [email protected] (3.7VA) transformers I have here and it's tiny, metal part is 38mm x 30mm, center core is 1cm x 1cm.
...
Forum: General Electronics Technical Discussion 06-10-2021, 02:24 PM
Replies: 87
Views: 632
Posted By eccerr0r
Re: Fixing a laboratory waterbath

Multiple outputs are fine, as long as they are isolated, and can deal with the total power. The size of the metal core on the transformer is a very strong indication of maximum power the transformer...
Forum: General Electronics Technical Discussion 06-10-2021, 12:35 PM
Replies: 87
Views: 632
Posted By eccerr0r
Re: Fixing a laboratory waterbath

The two higher voltage (20V/"15"V) units are much, much bigger than necessary. You will not even get close to 1A - the other components can't handle the current, otherwise the specifications are...
Forum: General Electronics Technical Discussion 06-10-2021, 11:46 AM
Replies: 87
Views: 632
Posted By eccerr0r
Re: Fixing a laboratory waterbath

Do Not Touch = Do not solder the transformer or anything else to them.

And technically you probably could get two (*maybe* just one) 5V and a 12V SMPS/regulated wall warts to replace the...
Forum: General Electronics Technical Discussion 06-10-2021, 11:28 AM
Replies: 87
Views: 632
Posted By eccerr0r
Re: Fixing a laboratory waterbath

The board with the transformer on it is probably better to do wiring hookups perhaps?
DNT = Do Not Touch
8V = 8 volt output, I would say 6.3VAC-8VAC is good
15 = 15 volt output, I'd suggest...
Forum: General Electronics Technical Discussion 06-10-2021, 10:43 AM
Replies: 87
Views: 632
Posted By eccerr0r
Re: Fixing a laboratory waterbath

Yes technically you can go up higher but the higher the input, the hotter the device will be. As far as I can tell, the two wire pairs that go straight to a bridge and regulator, limited by how hot...
Forum: General Electronics Technical Discussion 06-10-2021, 09:00 AM
Replies: 87
Views: 632
Posted By eccerr0r
Re: Fixing a laboratory waterbath

I think he stuck desoider braid in the slots between the wire connections of the transformer... The remainder of the pin stubs are within the plastic to the two sides of where the desolder braids...
Forum: General Electronics Technical Discussion 06-10-2021, 08:38 AM
Replies: 87
Views: 632
Posted By eccerr0r
Re: Fixing a laboratory waterbath

It is being used, I just don't quite understand how it's being used... You will need all three but I don't understand the 20V yet -- if it indeed is 20V. It could be the 15 still... Or even 8...
...
Forum: General Electronics Technical Discussion 06-10-2021, 08:15 AM
Replies: 87
Views: 632
Posted By eccerr0r
Re: Fixing a laboratory waterbath

what's bothering me now is I don't see a rectifier and how it derives the negative voltage for the 7107...
and the track wire mess with all those jumper connections is causing my brain to hurt......
Forum: General Electronics Technical Discussion 06-10-2021, 07:37 AM
Replies: 87
Views: 632
Posted By eccerr0r
Re: Fixing a laboratory waterbath

Eeek. Looks like another board layered on top of the board. Probably a 7107 hidden underneath, but what I don't get is why this board needs 20V... hmm...

wasting more of Topcat's hard disk space...
Forum: General Electronics Technical Discussion 06-10-2021, 07:17 AM
Replies: 87
Views: 632
Posted By eccerr0r
Re: Fixing a laboratory waterbath

btw redwire, again we find crossposting on different sites, do you happen to monitor reddit and see this guy's posts there or did you happen to search and find it?

I don't monitor reddit...
Forum: General Electronics Technical Discussion 06-10-2021, 06:48 AM
Replies: 87
Views: 632
Posted By eccerr0r
Re: Fixing a laboratory waterbath

To confirm that other voltage, yes the other board pictures would be nice.
Ideally you want the voltages to match. Theoretically you can go 'up' a little and it would be fine but it would stress...
Forum: General Electronics Technical Discussion 06-09-2021, 09:42 PM
Replies: 87
Views: 632
Posted By eccerr0r
Re: Fixing a laboratory waterbath

It looks like 15V should do for the "middle" AC output and the 8VAC for the 5VDC circuit Not sure what's up with the other output (the "green" pair on wFziNau.png), just noticed it goes to the...
Forum: General Electronics Technical Discussion 06-09-2021, 09:25 PM
Replies: 87
Views: 632
Posted By eccerr0r
Re: Fixing a laboratory waterbath

You may have lucked out, if there's nothing else connected to those 8 pins, one set of the 15 or 20V isn't even connected to anything. The other set is rectified and brought through a regulator and...
Forum: General Electronics Technical Discussion 06-09-2021, 06:53 PM
Replies: 87
Views: 632
Posted By eccerr0r
Re: Fixing a laboratory waterbath

Based on the board layout an educated guess is that they are isolated from each other, but which voltage to what is the trouble. Since the pins on the transformer is damaged it would be hard to...
Forum: General Electronics Technical Discussion 06-09-2021, 05:59 PM
Replies: 87
Views: 632
Posted By eccerr0r
Re: Fixing a laboratory waterbath

You *may* be able to depending on where the circuit is connected. But putting 20V on the input that wants 8V may required in more snap crackle pop crispies....

Even the 20V on 15V there's no...
Showing results 1 to 25 of 500

 
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