Negative Power Supply

[denny9167]

I wanted to build a negative power supply from the circuit below. I assume that changing the transistors to PNP types, reversing the direction of the zeners, and the bridge is correct? The closest equivalent to the BF459 in a PNP type is an NTE39.

 

[Bibliophile]

Simple.
Make the + output the common or ground connection and the 0 output now becomes your - output.

 

[DUG]

Don't forget capacitor polarity!

 

[denny9167]

Don't forget capacitor polarity!

Yes that's definitely a must!

 

[denny9167]

Simple.
Make the + output the common or ground connection and the 0 output now becomes your - output.

Yes that would be simplest solution. Thanks

 

[AndrewT]

The capacitor polarity stays the same.

All you do is relabel the outputs. and move the ground connection if it is needed. or remove it if it is not needed.

The zero becomes the -ve output
the +ve becomes the zero output.

After you have modified anything, use a bulb tester for next power ON.