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/diy/ - Do It Yourself

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739023 No.739023 [Reply] [Original]

can anyone tell me what that black burnt piece of shit is? this is in a 24v/2.5a transformer that I need to get working again... should I just be able to replace the component? I know how to solder. thanks for your help in advance.

>> No.739027

bridge rectifier. it's 4 diodes connected so that ac goes in 2 sides, dc out the other two. note where the +,-,~,~ marks are, desolder it and look for the pat number

>> No.739030

That looks alot like a diode bridge rectifier.
I'm guessing the "S" symbol indicates the Ac taps and the + and - are obviously the Dc pins.

But I can also see those massive diodes (6a10) up there too, so I'm not sure.
Probably there are two bride rectifiers from different voltage taps.

You can unsolder the black cube and either replace it with the same or similar one - or replace it with 4 discrete diodes.

This one looks similar enough :
http://www.parts-express.com/400v-6a-bridge-rectifier--050-030

>> No.739034

you guys are awesome thank you so much.

googling "black electrical component" only got me so far lol

ill go grab it out of my car and check to see if i can spot any other identifying marks... i didnt see any before (which was the problem) but i think maybe they got burnt off...

anyways what do you think could have caused this? i kinda dont want it to catch on fire.

>> No.739035

oh damn and i also meant to ask.... is the rating (e.g. 400v 6a, 200v 50a) the maximum it can handle or ought that match the specs of the transformer exactly?

the transformer takes 110/115v ac and outputs 24/39v dc at 2.5amps... at least thats what the manual says... why are there 2 voltage values?

jesus i should have taken some electrical engineering classes

>> No.739077

>>739035
What is the transformer powering ?
Different voltage values would either indicate you have a variable voltage - constant current powersupply, or multiple cables coming out ( for example 3 cables - one 24v one 39v and ground )


As for the bridge rectifier, it doesn't need to match as long as each variable - Voltage and current (eg. 400v 50A) - is superior to what is needed.
If you buy a 1200v 100a one, chances are it will never break or burn but chances are it won't get into the case either.
The ratings are usually not written directly on the component, you get a part number.
Google that part number and you'll easily find a web site or pdf with everything you need to know about it.

>> No.739098
File: 482 KB, 245x160, cpt_murrica_electricity.gif [View same] [iqdb] [saucenao] [google]
739098

>>739023
Sorry, couldn't resist...

>> No.739110

>>739030
Visualize what you see as an 'S' turned 90 degrees; it's an AC waveform symbol.

>> No.739116
File: 248 KB, 616x349, Camp_Rectifier.png [View same] [iqdb] [saucenao] [google]
739116

>>739035
For me, I'd desolder one out of an old power supply from a computer. Bridge rectifiers are on every DC power supply under the sun.

>> No.739133
File: 34 KB, 300x300, 300x300.jpg [View same] [iqdb] [saucenao] [google]
739133

>>739110
Thanks yous Toki, It's nots like I didn't gets it that way... the first way arounds

>> No.740144

>>739077
Exactly what I needed to know. Thank you!

It's powering a Pride mobility llift chair. My dad just had a knee replacement and it just crapped out.

>> No.740159
File: 10 KB, 225x224, 1418350110852.jpg [View same] [iqdb] [saucenao] [google]
740159

>>739034
>googling "black electrical component"

>> No.741405

>>740159
yes yes much funny so lol

thats for all your help everyone