Hello,

I have been searching everywhere online for this combo transformer rectifier with no luck. Where do I look for such a thing? It's pretty compact (about 6cmsX5cmX6cm, something of that order) . I do not know the right term for it either. Thanks for any lead! (I even wrote to the company, but I have not gotten any reply. It's been a week).

 

Welcome to AAC!
That looks like an uncommon proprietary combo. I doubt you'll find a replacement other than from the maker.
What is it part of?
Why do you think it's faulty?

 

Hi, it's part of a bosch radio. One of the leads feeds a battery charging station and the other the radio itself.

I think it's faulty because the unit plugged in, blue blue outputs incorrect voltage (close to zero), and likewise with red red.

oh well

 

Is the size critical? Else you can use a transformer with 15-0-15 and 12-0-12 windings with Full wave rectifiers, or
a 15 volt and 12 volt secondaries with bridge rectifiers.

 

I guess that since I am ultimately trying to have fun by fixing this bosch radio, size does not matter too much. I will probably add two then!

 

How about replacing (externally) with a 19V laptop charger? They are inexpensive because so many are made, or you may already have an old one or more from old lapstops? They are typically good for 3A. Drop the output to 16.5V and 12V through two LM317s inside the radio.

 

I have just looked through the functionality of LM317 a moment ago. Very interesting!

 

Measure the resistance of the supply pair. (blue-brown?), often a thermal fuse is placed in the primary winding,
If so remove the cover , you may be lucky if it close to the outer edge and accessible.

 

I measured infinite resistance for blue-red, so I suppose that the windings are all good...

 

I go with @MaxHeadRoom
there could be a thermal fuse inside the cover/tape

 

Infinite so open circuit?
I would remove the case/covering and see if anything can be seen.
I have found some thermal fusing to be so buried in the winding it is almost impossible to replace it, easily, anyway!

 

By infinite, I mean that the windings are not touching each other, so good news on this front.

But why would there be a thermal fuse inside a transfo/rectifier? I mean, this Bosch is basically a radio, nothing that is supposed to get really hot at all...

 

Measure the resistance of the supply pair. (blue-brown?)

As already suggested, If this has gone open circuit - i.e. "infinite" it could be that the fuse has blown.

 

Okay, I will have a look at some point tomorrow and fill you guys back in-

 

But why would there be a thermal fuse inside a transformer..

I can only assume it is to prevent fire hazard etc, In some extreme cases the fuse is completely buried in the primary, so in the event of open circuit, you replace the whole transformer.

 

Who uses two wires of the same color for a DC output? I think it must be mislabeled and the outputs are AC. Did you try measurung the voltage on an AC range?

 

Yes, the two-color scheme is weird. I too thought it was mislabeled, but the voltage outputs are nil either way. Also, if the heat fuse is buried deep in the winding, what will be the point of replacing it if I am to "tear" the winding away?

Will open the thing tomorrow just for fun anyway

 

Most thermal fuses are near the outside of the transformer, just buried under a couple wraps of insulating tape. It is easy to remove parts of the tape around the primary side of the core, to see if there is a thermal fuse.
I have had one transformer that blew such a fuse due to stress or aging, but not because of thermal issues. I replaced it with an external fuse and the device is still running fine years later...
The primary winding, if open (infinite resistance), suggests a internal thermal fuse is open. Sometimes a voltage bump will cause a surge in current, which blows that fuse.

 

If it is in the primary the primary is usually wound on first which makes it virtually impossible to replace, I have had them.

 

Well, I opened it up: no fuse at first sight, and I do not see how they would fit a rectifier in there as well!