Electronics > Projects, Designs, and Technical Stuff
I have a short ( i think) and don't know where to start
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fsr:
I suggest that you follow the ratings on the original schematic, specially the transformer's parameters. You cannot expect something designed to operate with a 18v transformer to work with a 35v one.

And still, there are some design choices with this PSU that don't make a lot of sense, like using a transformer with two separate secondaries, and discrete fast recovery diodes to make two different bridges, essentially creating two separate PSUs, but then connect them to get a split PSU, which could be made with just a center-tapped transformer, a diode bridge and some big capacitors.
nick_d:
It is unusually complicated in the way you explained. On the other hand, if he already has the PCBs there it would be simplest just to build and use it as designed. Otherwise he has to make his own PCB. Also, having the 2 full wave rectifiers could give a better ripple spec than simpler designs with fewer diodes (or equivalently use smaller capacitors).
cheers, Nick
nick_d:
As well as that, I think OP is doing a fabulous job here. Each and every one of us posting on this forum has had many such facepalm moments :) :) The most important thing for success in electronics is perseverance and this OP has amply demonstrated. In my experiencs very design must be redone at least three times and so must every repair :)
Nick
Mechatrommer:

--- Quote from: ebastler on December 21, 2018, 08:39:17 pm ---
--- Quote from: AngraMelo on December 21, 2018, 07:18:55 pm ---Buddy, you are trying to build a project with the wrong parts.

--- End quote ---
Probably just a language issue, but you do come across as a bit condescending. For future posts, I would suggest omitting the "buddy" part.  ::)

--- End quote ---
the way i learnt from how US people talk and... from watching movies :P, buddy means close friend or good friend. if its a cultural issue, maybe i will stop calling German people buddy, Sir... if its age issue, yes sometime its show disrespect for a very young people to call buddy to an older guy, but this is internet we cant see how old are you, we assume all friend of the same age, ymmv Sir.


--- Quote from: nick_d on December 22, 2018, 12:10:58 am ---As well as that, I think OP is doing a fabulous job here. Each and every one of us posting on this forum has had many such facepalm moments :) :) The most important thing for success in electronics is perseverance and this OP has amply demonstrated. In my experiencs very design must be redone at least three times and so must every repair :)
Nick
--- End quote ---
yes 3 pages to find a short.. 3 pages of people speculating of whats going on and at last the OP showed some measurement, not hitting any of the speculation made, epic. due to lack of pictures, schematics and methodology description, rather than speculating, some people just made simple reply earlier...


--- Quote from: Mechatrommer on December 17, 2018, 02:45:00 am ---
--- Quote from: james_s on December 17, 2018, 02:25:00 am ---and you'll have some time to take measurements..

--- End quote ---
did he make any? what his multimeter (continuity tester) told him?

--- End quote ---
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