Reverse Polarity & Voltage Doubler

spacecommandant · Post by **spacecommandant** » 14 Nov 2022, 21:08

I apologize if this is in the wrong forum... I'm unable to post in the Power forum.
I'm wondering if the diodes in the voltage doubler circuit shown here act as reverse polarity protection as well.
(Actual 'doubled' voltage is closer to 16V)
Thank you...

Manfred · Post by **Manfred** » 15 Nov 2022, 02:02

I'm wondering if the diodes in the voltage doubler circuit shown here act as reverse polarity protection as well.

No, these do not act as reverse polarity protection.

mauman · Post by **mauman** » 16 Nov 2022, 00:29

If you want to protect the 470u cap and the 555 IC from reversed power, you'll need an in-line Schottky at the point circled.

: VDoublerDivider.PNG (39.9 KiB) Viewed 10263 times