| 2 secondaries ,2 rectifiers and 2 regs, - rectifier overheats - Click HERE for Original Thread |
| Nordic |
My transformer has 2 12V secondaries.
Marked as pin 1 + pin 3 and pin 2 + pin 4.
Now the idea was to use each secondary to power 1 channel of a headphone amp... each with its own rectifier ... wich I made with big diodes (all I had in the box) in turn connected to a Voltage reg after some CCC filtering, I have not connected anything further than the regs, one measures 12.1V one reads 11.9V (100v range so not too accurate)....
What bothers me is that the diodes became hot enough to smell (luckily didn't burn due to 8A rateing.)
The 2 regs are completely seperate from each other except for inductive link in transformer... should I have it wired up diffirently?
currently 1 + 3 and 2 + 4 used with 1 and 3 tied to same point on respective bridges... i.e. I tried to make the halves the same.... |
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| Nordic |
ok, found a wireing mistake... (traces not cut on stripboard)...
Now it doesn't overheat but each 12V reg is putting out 16V....
I Assume the regs are dead. right? |
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| deduikertjes |
| quote: | | I Assume the regs are dead. right? |
Well, if voltage before reg = voltage after reg AND you didn't make another wiring mistake then the regs are dead
succes, Marco |
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| Nordic |
| Thanks man, I noticed there was infact a voltage drop over the reg, after buying 4 new ones this morning I had the briight idea of replaceing the battery in my multimeter... was waaaaaay flat it seems... all is fine now, just getting the courage to make the final connection between PSU and amp now... will try one channel at a time I think. |
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| deduikertjes |
Please do measure if there are any dead shorts in your amp between supply lines and earth...
Could save you some smoke.
And if you don't like the use of fuses in your supply lines then:
I like to add some small power resistors in the supply lines with a power which slightly above the expected power in these resistors.
Your nose will then tell if something is going wrong...
succes, MArco |
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