I'm glad it helped. 

I was thinking of a free old discarded extension cord, myself. I just got back from the thrift store is why!

I will ask my Q here, although it probably belongs elsewhere.
I was thinking of using a wallwart transformer to increase the volts of my EER.
Lets say I am getting 80mv if I use the 220uH inductor added to my EER.
So, if I use the 120/3v transformer I just took apart, and if I use it in reverse I should be able to get 24v out of it.

Well, I am gonna try, anyway.
My question is about the 2 diodes. I assume I should just solder a wire across them so the EER can go in either direction.

Right?

Or, maybe I should remoe the little circuit board and just hook up the wires. Has anybody else done this?

thanks,

jeanna

jeanna said:

Quote
I was thinking of a free old discarded extension cord, myself. I just got back from the thrift store is why!

Be careful.  If it's garbage, then someone threw it away for a reason.  Check the continuity first.

Quote
Lets say I am getting 80mv if I use the 220uH inductor added to my EER.
So, if I use the 120/3v transformer I just took apart, and if I use it in reverse I should be able to get 24v out of it.

That should work, as long as low current levels aren't critical.

Quote
My question is about the 2 diodes. I assume I should just solder a wire across them so the EER can go in either direction.
Right?

Make a rectifier?  If so, that should be okay.  But are the diodes connected to the transformer output?  If so, soldering that connection as a short will cook your transformer, right?  The secondary coil output leads would be soldered at the diodes, yes?

Quote
Or, maybe I should remoe the little circuit board and just hook up the wires. Has anybody else done this?

The wires seem simpler to me, but it depends on what you want to do with them?  I never took apart a wallwart to see what was inside.

--Lee

Yes jeanna, I have tried this.

I would remove any circuit boards utilized by the transformer. Chips don't resonate, caps and coils do. But you'll need more then 80mv to build a field in the transformer. From my experiments, the transformer can only help you as an inductor at such low voltages. Current is really what it takes, it's the inrush until the field is established.

What you could do is take the stored current from the caps in small pulses, then that transformer will give you something usable. But give it a try either way, I'm sure you'll think of something I did not.

QuoteMy question is about the 2 diodes. I assume I should just solder a wire across them so the EER can go in either direction.

I don't think I understand what you mean.

t3t4

Thank you both,
My math was a decimal off too.
80mv is not the same as .8v! 
I would be getting 2.4v ac out of it if it works.

I gather the diodes are because the wall wart doesn't want to let any backup so there are diodes. I never opened one of these before so I was surprised to see them.
I could use just the wires, it is just cut close there and I left about an inch of wire.

there is no chip, t3t4, just the transformer and 2 diodes.

I guess for 79 cents if I break it ... what's to break anyway? just 2 levels of wires.
OK I will first short the diodes on the board and if that doesn't show up as 2.4v on my scope, I will cut the board off and add some wire to the very short wire ends.

thanks,

jeanna

@ jeanna

Quote from: jeanna on August 28, 2009, 06:35:42 PM
Well, I am gonna try, anyway.
My question is about the 2 diodes. I assume I should just solder a wire across them so the EER can go in either direction.

Right?

Or, maybe I should remoe the little circuit board and just hook up the wires. Has anybody else done this?

I would recommend opening the case and removing just the transformer. The diodes are on the wrong side of the transformer if you are using it to increase voltage.