Having trouble with a voltage doubler circuit....

[DaveHardy]

I'm having some strange problems with this circuit.  I'm trying to get 100V DC where the blue probe is in my picture.  Unfortunately, I am only getting about 25V when measured from the green probe (ground) to the blue probe (output).  However, if I measure from the red probe to the blue probe, I get the full voltage without any loading effects. 

I've tried numerous configurations and have had mixed luck so far. 

Can anybody help me?

[T4P]

It's a cockroft walton right ?

1) AC supply please,no bridge rectifier needed
2) Depicted is a two stage multiplier, yours looks like a 2-1/2 stage

[digsys]

Try it this way -
The first step charge is conflicting with the DC supply to the regulator, which need a filter cap, 220-1000uF depending on power
required. And it still maintains a reference to the +- rails.

[DaveHardy]

Thanks for the replies guys.  I know that you are going to hate me for this answer, but I tapped into a "Home Brew" PSU circuit that I got from a trade and just assumed that everything was chipper.  After very close inspection, I realized that It has two transformers in it and the secondaries are wired in a totally unconventional manner - THEY ARE TOTALLY FLOATING!!.  This is why I was getting low voltage when referencing ground.

The Circuit Works Just Fine and BTW, tapping into the positive output of the bridge as a reference gives it an added boost with fewer parts.

Yes, I forgot to put caps before the regulators:)