Center Tap VDC and -VDC and still use the 48VDC phantom power without doubler? - diyAudio
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Old 15th March 2014, 02:07 PM   #1
777funk is offline 777funk  United States
diyAudio Member
Join Date: Feb 2007
Location: MO
Default Center Tap VDC and -VDC and still use the 48VDC phantom power without doubler?

I built an preamp with a 30VDC Full Wave to CT to -10VDC power supply taken from a 28V-CT-28V transformer. I'm about to wire a 48V phantom power and realized that if I connect the 48VDC full wave bridge's ground to the full wave (not bridge) 30VDC power supply center tap i.e. main ground in the preamp I'm shorting half of the power to ground and now only have 24V phantom and a hot transformer obviously. I'm assuming there's no easy way around this to get the 48VDC other than using only one 24VAC tap off of the V-CT-V transformer then building a doubler. Is this correct? In other words I won't be able to take advantage of the full 56VAC available from the outer taps of the transformer. I making sure I'm not overlooking something simple (which has happened before).
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