If you like a simple challenge, perhaps you could suggest components to construct a timed polarity changer that can run on 4.5v and be very economical on power consumption.

Three D-cells in series with two DC outputs (one +, one -), after 3 minutes the polarity would switch, after 3 more minutes the polarity would switch back, infinitetly...

perhaps a micro relay could be used?

circuit current will be non-existant, only importance is the potential
thanks for any help

FixMyCPU@yahoo.com

 

Is this an assignment for school?

 

You'll probably think I'm crazy, but here goes...

There is a device invented by Lee Crock which originally used 3v, but it has since been proven that 4.5v works better. I was hoping that someone could help in creating the switching mechanism so that I (and others) could build our own...

Google for "Lee Crock" or "Aura Cleanser" for info about the device...

Thank you for any suggestions!

 

I have attached a very rough overall of the circuit.
It will be powered by NINE "D" batteries

 

Ummm... Okay...


You can use a 555 timer, since the 3 minutes is not critical. The o/p from the timer can switch a transistor which in turn controls a DPDT relay.

Bill_Marsden has designed an LED flasher which can be modified to suit your need:
http://forum.allaboutcircuits.com/showpost.php?p=117639&postcount=4
see also: http://forum.allaboutcircuits.com/showthread.php?t=15342