Power source

[Plinio Andres Barraza]

I agree, I really need a good power source and making one would be good
experience.  I realized that this power source (from other members on the
list and the display on my "new" scope, an RCA last calibrated on 1974) is
simply fulwave rectified and no smoothing -probably because its just used
to push little cars across a track. The cap I used worked well but now I
have a problem.  I used two identical resistors to divide voltage and get
a ground out, Problem is once I connect a circuit the voltages go crazy
and ground moves to about two volts from the positive rail. 

 How can I buffer the power source so that other resistances in the
circuit dont change the scale of the power source?