Electronics > Beginners

Tapered transformer and two rectifiers! Need help!

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001:
Can I get two DC voltages from this transformer? What circuit I need?  |O

Gyro:
Only half wave rectified (if you want them both referenced to a common ground).

IF you can separate the connection between the 8V and 30V windings, then you can simply use two bridge rectifiers one on each winding.

Rigolon:
I'm not really into the power aspects of electronics.
But if I remember correctly there is a better way to do what you want. You should use your tap wire as neutral (gnd).

Sorry for my drawing, hope you guys can understand. And as I said, not really my thing, I might be dead wrong with this.


EDIT:
Another idea, that I'm sure I've seen somewhere. In OP's drawing you could connect B+ to GND of bridge A. And GND of bridge B becomes B-.

T3sl4co1l:
You could half-wave double the extra end.  That keeps power factor okay, but the output still has 50/60Hz ripple, as the name suggests.

Otherwise you can FWB the full winding and use buck converters to derive other rails.

Tim

gbaddeley:
The drawing will produce about 84v peak across the output resistor, as it is a half wave voltage doubler on the 30vac winding. The 8v winding doesn’t contribute anything, as it’s diodes will alway be reverse biased, against what is produced by the 30v winding.

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