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Clamper Turns into Voltage doubler when no load is attached

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tkcmd

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I made this little power supply but i have a problem wich i cant explain

**broken link removed**

When i make it like in the schematic my voltage between posive and ground terminal gets 48V (2x24V) and between negative and ground only -1V.
As soon as i add a 10k Ohm between the positive and ground terminal i get +24 V between + and ground and -24V between - and ground as it is supposed to be
Can someone explain me how it comes then when no load is attached the circuit acts as a voltage doubler ?
 

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