Mosaic
Well-Known Member
Hi all:
I have a 120VAC transformer with secondary 2 coils...
Individually the secondaries give 13VAC and 25.5VAC or so.
By joining each secondary I am able to get 38.5VAC which gives 51.7VDC after a FWB and 7500UF smoothing cap.
Ok...Now I want to make a lower voltage DC as well, so I run the 13VAC segment of the joined secondaries into another FWB and smoothing cap. This gives 17.7VDC. BUT the negatives from each FWB (circuit ground) have a potential difference of 11.7VDC!!
How can I get a common ground for each of the DC volts, 51.7VDC & 17.7VDC?
I have a 120VAC transformer with secondary 2 coils...
Individually the secondaries give 13VAC and 25.5VAC or so.
By joining each secondary I am able to get 38.5VAC which gives 51.7VDC after a FWB and 7500UF smoothing cap.
Ok...Now I want to make a lower voltage DC as well, so I run the 13VAC segment of the joined secondaries into another FWB and smoothing cap. This gives 17.7VDC. BUT the negatives from each FWB (circuit ground) have a potential difference of 11.7VDC!!
How can I get a common ground for each of the DC volts, 51.7VDC & 17.7VDC?