# Thread: Voltage Doubler real output.

1. What is the output of this circuit and why?

fullwavedoubler.jpg

What is the real output of this circuit and why? It's name is voltage doubler but I connect it to 230V AC and tested output with a multimeter it shows 640 V DC, is it really output 640 V DC? why? and how can I made a doubler with 440 or 450 V DC out? I can not use transformer for some reasons.
also I have a 500 V 1200 uF cap that I want to charge it only with 450 V 1200 uF (120 J), what happens if I connect that cap to this doubler? Does it charge to 500 volts (150 J)? how can I charge a 500v 1200 uF cap to only 450V?

2.

3. The output is double the peak voltage So that is

A crude and inefficient way of getting a lower voltage would be to use a voltage divider. That is only suitable if you are drawing very little current. If you want significant power out then you need something like a switched mode power supply.

What is the best linear voltage regulator for this circuit to give me constant 400 to 450 volt DC?

5. You could use zener diodes, if the circuit does not use too much current. The zener diodes are only available up to 200 volts, but you can just put a few in series.
Zener diodes : DIODES AND RECTIFIERS