+/- 15vdc psu help

rockstudio · 3rd March 2006, 04:20 AM

Hello, I am trying to construct this psu from Gyraf.dk - http://gyraf.dk/gy_pd/calreq/minipsu.pdf
I switched the ac ties to the bridge (I am using the DF04M)
and a hammond trannsformer 164h20.

When it is assembled I get +28vdc and -.00 something. what gives? I have built this twice to try to figure it out, but I am not that advanced yet. Can anybody help me or suggest a different schematic? Thank you!

rockstudio · 3rd March 2006, 04:46 AM

ok, I read up a little bit and I connected the ground going to the bridge from the ct of the tranny. (Duh, you say??) And I have now +15vdc and -8.9. I think my 7915 may be in backwards, but It is hard to tell, I am really dislexic! The 7815 is installed the same way and it works fine, but the 7915 is super hot and not outputting correctly. weird. I made a pcb from the gyreaf drawing, but like I said I swapped the inputs from the ac to the bridge.

rockstudio · 3rd March 2006, 05:34 AM

Yep, the 7915 was swapped. Got it going good, sorry for the posts!

lineup · 3rd March 2006, 05:51 AM

Quote:

Originally posted by rockstudio
Yep, the 7915 was swapped. Got it going good, sorry for the posts!

good you fix things self

a +-supply using 7815 and 7915 is not very complicated

still, if one detail is not alright, even best electronic guy
can not get it work

3rd March 2006, 04:20 AM	#1
rockstudio diyAudio Member Join Date: May 2005 Location: St. Simons Island, GA	+/- 15vdc psu help Hello, I am trying to construct this psu from Gyraf.dk - http://gyraf.dk/gy_pd/calreq/minipsu.pdf I switched the ac ties to the bridge (I am using the DF04M) and a hammond trannsformer 164h20. When it is assembled I get +28vdc and -.00 something. what gives? I have built this twice to try to figure it out, but I am not that advanced yet. Can anybody help me or suggest a different schematic? Thank you!

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3rd March 2006, 04:46 AM	#2
rockstudio diyAudio Member Join Date: May 2005 Location: St. Simons Island, GA	ok, I read up a little bit and I connected the ground going to the bridge from the ct of the tranny. (Duh, you say??) And I have now +15vdc and -8.9. I think my 7915 may be in backwards, but It is hard to tell, I am really dislexic! The 7815 is installed the same way and it works fine, but the 7915 is super hot and not outputting correctly. weird. I made a pcb from the gyreaf drawing, but like I said I swapped the inputs from the ac to the bridge.

3rd March 2006, 05:34 AM	#3
rockstudio diyAudio Member Join Date: May 2005 Location: St. Simons Island, GA	Yep, the 7915 was swapped. Got it going good, sorry for the posts!