Easy Adjustable DC power Source

[Russ Huber]

Correct Amperage/voltage Variable transformer - Full wave bridge rectifier. AC polarity does not matter. DC polarity upon application to motor may need to be reversed. AC  and DC leads soldered on to the FULL WAVE bridge rectifier leads. Heat shrink used to insulate soldered leads. Friction tape wrapped over heat shrink leads.

 

Edited September 1, 2022 by Russ Huber

[Jim Kovar]

How does one figure out which slot on the Variac's outlet is the AC positive (+) voltage?

Obviously, the other has to be the AC negative (-) voltage.

[Jim Kovar]

Will the full wave bridge rectifier
blow up if the AC (+) and AC (-)
are hooked up swapped?

[Russ Huber]

1 hour ago, Russ Huber said:

AC polarity does not matter. 

Richard, disregard Mr. Kovar's comments. AC hot and common go in to the 2 center leads.  DC output the 2 outside leads.

[Mark Olson]

12 hours ago, Jim Kovar said:

How does one figure out which slot on the Variac's outlet is the AC positive (+) voltage?

Obviously, the other has to be the AC negative (-) voltage.

You have to be really fast with your meter probes

[Paul Carmody]

13 hours ago, Russ Huber said:

Richard, disregard Mr. Kovar's comments. AC hot and common go in to the 2 center leads.  DC output the 2 outside leads.

 

[Russ Huber]

38 minutes ago, Paul Carmody said:

 

Nothing to sweep under the rug. Someone bought a DC motor from me, and he wants to test it.  I told him about this method of making a variable DC power source. I thought I would share it with he and others if interested. AC Polarity to the rectifier means nothing. I did state that. The pictures I thought would be helpful in showing the DC power source simplicity. All the additional comments I am sure have him scratching his head. 

[Paul Carmody]

3 hours ago, Paul Carmody said:

Richard, disregard Mr. Kovar's comments.

I should have isolated just this.

I am just mere mortal in this fan world and would not dispute your words 🙂