Self Running Micro TPU, with closed loop.

[4Tesla]

Isn't it a common parallel LC circuit?  When the primary collapse it will assist in recharging the cap.

Edit: Might need a diode on the primary to keep from going negative.

4Tesla

[hakware]

to induce a magnetic field in the core you need to switch the current on and off, this is what the transistor does in the original design. without it the cap
will completely discharge in the primary within a few moments. it is an LC but since the capacitor is discharged through the loop it is just a matter of the LC time till the capacitor is discharged.
The transistor or switch or something needs to be in place to commutate the flow of electricity to the primary in your diagram. Im pretty sure it would work and I like the design.

The but I think the secondary needs to be on the order of 80 winds with a center tap this should keep the voltages up and hopefully increase run time. Maybe today I might wind up a core like your diagram and throw a transistor in there see what happens. I wish I could find some leds with very low forward voltage drop. like less than .5V . (I wish)

[4Tesla]

Another possible problem is that the full-wave rectifier is based on a +/- sine wave on the primary... but this circuit modified somehow may work.

Idea:  After making the toroid with the center tap.  Hook up the primary to a DC pulse ran by a battery, power supply, or function generator and with the secondary unhooked see what the output looks like on the scope and then add the components for the closed loop circuit based on the the output of the secondary.

4Tesla

[4Tesla]

Hi alexnz,

Welcome to the forum and the MTPU thread!  I also only know the basics and would like a detailed explanation of how the circuit works.  Besides the current flow schematics from EMdevices, there hasn't been been much discussion on how the circuit works.  I understand most of it, but not all.  I still don't get the trigger coil at all and why it is needed.

You're the 3rd new member, including myself to join this forum because of this thread.. It's cool, because the circuit has only a few inexpensive components, so the circuit doesn't cost much to build!  The only expensive part is getting a scope.  I was lucky to get one from my father.

Look forward to your discussion,
4Tesla

[Localjoe]

In this circuit when resonance is achieved does the cap disappear and then become part of the reactance of the LC circuit. I found that bit of info in one of the old tesla pages it says when this effect happens the inductor L1 and the cap effectively disappear and a large voltage is created across the resistor. This may not apply here but its always easy to forget to tie your shoe when your working on rocket science ..
                                                               Joe