AC from Joule Thief Secondary/pick-up

[Mk1]

@ MK1

i think you need to build one before predicting the out put will be glad to post a picture of mine any add on circuits go between the  secondery coil end opposite the transister drive hookup and ground . mine runs on 12 volt but could be more or less components make the difference.
the goal was stated as getting to higher power if i got what Jeanna was saying in the post.
Martin

LoL Welcome to the jt , i already did that , and i was not the first one . And don't worry i rarely assume this stuff , do you have a high freq transformer ? Like a mot ? or other high Q device ? Then yes it is limited at 60 cycle .

@ all or may i saw those that listen to what i have so say ...

i have a goody i posted next door .

[nueview]

sorry again MK1 but it's a standard radio shack iron core 120 to 24 volt center tapped 2 amp output transformer and it ain't putting out 60 cycle .
Martin

[Mk1]

sorry again MK1 but it's a standard radio shack iron core 120 to 24 volt center tapped 2 amp output transformer and it ain't putting out 60 cycle .
Martin

Very well then ! please give us more info , you got some readings , what freq do you have on the secondary ? and voltage what , and what source 1.5 volt ? saturateble core or not.

please tell us !

Mark

[nueview]

the transisters are darlington pair
the voltage as stated is 12 volt
the frequency is about 15 k hertz
the original circuit came from a coleman electric lantern about 20 years ago
i just boosted it up you should be able to as well
the components are are what it's all about .

Really liked the magnet point it makes perfect sense.
Martin

[jeanna]

@MK1
I like that magnet idea. I will try it this afternoon.
thanks as always you have great ideas.

hi All
just a question for possible thought why not build a double JT around a center tap transformer

I am not following this.
The JT is a centertapped transformer, so are you saying to wind 2 of them?

i

f the batteries are on the center tap leg and paired transistors are at the ends of the center tap coils and you take the signal from the secondary side to drive the pair of transistors in opposite directions the power should be better and the output more ac in quality having spikes both pos and neg

The secondary already produces AC, so that is where I am beginning with this.It seems the tuning of the toroid and the number of winds and the transistor etc all play an important part in making a good jt circuit.
I tried having one jt power another. The lights went very dim, but then I found the second transistor was not needed, as the pulse from the one, was enough.
Also, I can control the frequency of the whole thing by controlling the resistor at the base of the transistor ("base resistor") the higher the base resistor goes, the higher the frequency. to a point but the point is very high.
The trouble is that as this frequency rises, the total voltage decreases.

Thanks Martin,

Do you have a pic or a drawing that will show your results with this?

thanks,

jeanna