Joule Thief

[Mk1]

@ist

I have to say i am a bit confused about those results , but 4 X 30 v dc is not that bad. (my toroid must really be a good one)
It was green but not used has a choke like the one on Jim's picture.

Have you tried the positive feedback?

Mark

[electricme]

@all
I have run into a problem.
Has anyone got a simple circuit that can operate from say .6 volt to 3 volt, so I can put 1.5 volt back into my 1.2v NiCad

The JT has been designed for 1.5volt batteries, to recover the last energy that is left in it.
It has not been designed for 1.2volt batteries (as I am using)


So as I am trying to recharge a 1.2v wet cell, I need a tiny bit more than 1.2v to do this.
LM317 wont go that low before it begins to operate and needs a couple of volts overhead to do this correctly.

Any ideas?


General Jim

[innovation_station]

a few more jts i made ...

have not ran them yet

i built another lastnight it is made of a feroite bobbin  with a hole in the center   it has a winding round it horz ....  i put a 6 turn jt on it


ist

[nievesoliveras]

Thank you @pirate
Thank you @electricme
Thank you @mk1
Thank you @ist
Thank you @gadgetmall

@all
I have run into a problem.
Has anyone got a simple circuit that can operate from say .6 volt to 3 volt, so I can put 1.5 volt back into my 1.2v NiCad

The JT has been designed for 1.5volt batteries, to recover the last energy that is left in it.
It has not been designed for 1.2volt batteries (as I am using)


So as I am trying to recharge a 1.2v wet cell, I need a tiny bit more than 1.2v to do this.
LM317 wont go that low before it begins to operate and needs a couple of volts overhead to do this correctly.

Any ideas?


General Jim

My toroid circuit works with less than a volt and recharge the batteries. With the diodes added on the way they are, the charge battery does not lose the charge and the source battery last longer. No OU though.

Jesus

[WilbyInebriated]

@all
I have run into a problem.
Has anyone got a simple circuit that can operate from say .6 volt to 3 volt, so I can put 1.5 volt back into my 1.2v NiCad

The JT has been designed for 1.5volt batteries, to recover the last energy that is left in it.
It has not been designed for 1.2volt batteries (as I am using)


So as I am trying to recharge a 1.2v wet cell, I need a tiny bit more than 1.2v to do this.
LM317 wont go that low before it begins to operate and needs a couple of volts overhead to do this correctly.

Any ideas?


General Jim

try a voltage regulator like a UPC2933 (mine drops out at about .7v) or LT1084CP (datasheet says drop out at 1v), which are similar to an LM317, but of the low dropout type.
i use the UPC2933 in my mains to 1.5v converter, see this post for the circuit. http://www.overunity.com/index.php?topic=6123.msg145788#msg145788
hope that helps.