Why cant a newbie get a break....PANG! (=the sound of the +5v rail caps on the api preamps exploding)
My +5 volt regulator (7805) just crapped out, after three hours of use!!! Now i get 28volts out on the +5 rail.
This happened with only two relays engaged!!! It wasnt even very hot when i touched the heatsink btw.
I have four channels connected at the same time. I just built a new psu, as my old one wasnt working properly (i will fix the old one when i have more time)
I did the mod, where you take the power for the relays from the r1/c1 junction.
no r10, just a wire link from input of 7805 to r1/c1.
the toroid gives is a 2x25va and i measured 28v ac in to the psu before regulated/rectified.
r11 is 1k (not shure if this can matter? (how do i decide which value here is appropriate?)
Could it be i got a bad 7805 regulator from the store?
Heres the schematic for the bauman psu: http://www.thediypill.phx.com.br/forumfiles/psu312sch_v1.pdf
What the hell is wrong here? Im going totally crazy, and im seriously doubting my abilities as a diy builder. I have never had so much trouble, and worked so hard for anything to work before in my life...
But i just cant seem to get a break, however much i try to fix this damn pre.
Please help a diy brother out, im so very depressed so i cant even think about anything else at the moment.
sincere regards,
Jonas (probably the unluckiest diy builder around)
My +5 volt regulator (7805) just crapped out, after three hours of use!!! Now i get 28volts out on the +5 rail.
This happened with only two relays engaged!!! It wasnt even very hot when i touched the heatsink btw.
I have four channels connected at the same time. I just built a new psu, as my old one wasnt working properly (i will fix the old one when i have more time)
I did the mod, where you take the power for the relays from the r1/c1 junction.
no r10, just a wire link from input of 7805 to r1/c1.
the toroid gives is a 2x25va and i measured 28v ac in to the psu before regulated/rectified.
r11 is 1k (not shure if this can matter? (how do i decide which value here is appropriate?)
Could it be i got a bad 7805 regulator from the store?
Heres the schematic for the bauman psu: http://www.thediypill.phx.com.br/forumfiles/psu312sch_v1.pdf
What the hell is wrong here? Im going totally crazy, and im seriously doubting my abilities as a diy builder. I have never had so much trouble, and worked so hard for anything to work before in my life...
But i just cant seem to get a break, however much i try to fix this damn pre.
Please help a diy brother out, im so very depressed so i cant even think about anything else at the moment.
sincere regards,
Jonas (probably the unluckiest diy builder around)