BEMF Scavenger Cruda

[z.monkey]

So, as I am sitting there, soldering together the squarewave generator, I'm thinking why only hit the inductor in one direction?  We gotta a double throw relay, so lets smack it around both ways.  I'm an alternating current kind of guy anyway.  So I use my tricky wiring super powers to make the inductor current go both ways...

Also made a Schottky Bridge Rectifier to smooth out the bumps...

[z.monkey]

It occurred to me after I had posted all of this that I am using the secondary on the audio transformer.  The high impedance winding.  The low impedance winding is probably too much for my tired AAA battery pack...

[z.monkey]

So, after a day of playing with my BEMF trap the AAA battery pack is worn down to around 4 volts.  The reconfigured circuit will pass DC and the BEMF into the trap cap (C1).  If I run the circuit without the inductor I get the battery voltage minus a couple of diode drops in the trap cap.  But when I use the inductor the trap cap voltage will swing up to 21 volts.  It does not maintain this voltage with a load.  I put an LED with a 220 Ohm resistor on the output the voltage on the output goes down to around 3.5 Volts.  So yes we can trap and store BEMF, but there is not much current there.  Maybe I should use a better inductor...

[z.monkey]

I'm thinking maybe I'll give a whirl with my Magnetized Composite Planar Transformer...
Gotta wait 'till I gets home tho...

[gyulasun]

So, as I am sitting there, soldering together the squarewave generator, I'm thinking why only hit the inductor in one direction?  We gotta a double throw relay, so lets smack it around both ways.  I'm an alternating current kind of guy anyway.  So I use my tricky wiring super powers to make the inductor current go both ways...

Also made a Schottky Bridge Rectifier to smooth out the bumps...

Hi Z.monkey,

I think it is very good idea to bring up this topic, especially the changing of the current direction in the coil that has a ferromagnetic core.  Please continue as you wish and when you have some time, have a look at this link here and go through on it because I find Nali2001's double MOSFET switch very innovative in his Circuit003.jpg: http://www.overunity.com/index.php?topic=4300.msg214471#msg214471
(in the Circuit003.jpg I think there is a gnd symbol missing from the right hand side MOSFET)

Keep it up, very educational and much needed job you do.

rgds,  Gyula