[RESOLVED] How to calculate the R?

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LAOADAM

Joined Nov 21, 2018
914
Hi all.
I am doing a AC-DC 0-200V Variable Power Supply Without Transformer. The OP got good result at:

and I used 110 V ac input, and R = 510K (OP used 560K), got the lowest V = 6.2 Vdc, how to get 0V? what's the reason? how to calculate the value of R?
Thanks

ac dc.JPG
 

dl324

Joined Mar 30, 2015
17,157
If you need to ask, you're out of your league and should find something safer.

I strongly advise ignoring any circuits using schematics like that. The people drawing them are unlikely to know what they're talking about. If they did, they'd put down their crayons and provide a real schematic.
 
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