Kapanadze Cousin - DALLY FREE ENERGY

[verpies]

From signal generator. My TL494 generator which uses 2N5401 driver / MJL21194 power transistors is not yet up and running on transformer.

Regards
Hoppy

I see.
Be warned that the >300V voltage spikes appearing on the collectors of your MJL21194 250V  transistors might damage them, unless you use some kind of voltage clamp parallel to the primaries of the transformer.
The clamp can dissipate (short-out) the voltage spikes or return their energy to the power supply. 
The latter solution is illustrated in my Reply #120 and Itsu has verified that this solution works.
This technique works even with the main Dally's Coil as the load (an LC Load), that has a nasty habit of feeding its energy back into the output of the TL494 generator/transformer.

[Hoppy]

I see.
Be warned that the >300V voltage spikes appearing on the collectors of your MJL21194 250V  transistors might damage them, unless you use some kind of voltage clamp parallel to the primaries of the transformer.
The clamp can dissipate (short-out) the voltage spikes or return their energy to the power supply. 
The latter solution is illustrated in my Reply #120 and Itsu has verified that this solution works.
This technique works even with the main Dally's Coil as the load (an LC Load), that has a nasty habit of feeding its energy back into the output of the TL494 generator/transformer.

As I'm using a mains transformer initially, how about transorb diodes across the primaries - 20V?

Regards
Hoppy

[verpies]

As I'm using a mains transformer initially, how about transorb diodes across the primaries - 20V?

When Itsu tried absorbing the spikes with snubbers made out of fast rectifiers and 5W Zeners (2*Vcc), connected back-to-back (shown here as D3-D6), the snubbers could not handle the energy in the spikes and burned up. 
They also increased the current draw from his power supply.

Maybe your transorbs are stronger, but they will not return the energy back to the power supply.
This energy becomes significant when an LC load feeds energy back into the secondary winding of the transformer + TL494.

[Hoppy]

When Itsu tried absorbing the spikes with snubbers made out of fast rectifiers and 5W Zeners (2*Vcc), connected back-to-back (shown here as D3-D6), the snubbers could not handle the energy in the spikes and burned up. 
They also increased the current draw from his power supply.

Maybe your transorbs are stronger, but they will not return the energy back to the power supply.
This energy becomes significant when an LC load feeds energy back into the secondary winding of the transformer + TL494.

See attached. I use these in preference to zeners. The 1.5KW 22A version has a vbr of 20.9V min 23.1V max. I do not find normal 0.5W / 1.3W zeners adequate for transient suppression in this type of application. Clearly energy is lost as heat in the zener or transorb diode and this is not being recovered but if we accept Dally's self-running claim, he was not disadvantaged by this wasted energy!!

Alternatively, the SA24A is a 500W device with a vbr of 24V/26.7V with 12.8A pulse rating.


Regards
Hoppy

[itsu]

@ all

After rewinding the primaries according to the circuit/diagram designed by verpies and publiced in post #120 the main generator is stable and produces clean square wave voltages.

Both primaries are 20 turns of this double speaker wire over the whole circumference of the yoke

The voltages on the both secondaries is much to high (almost 900V square wave), so i will have to lower that, but for the time being i could show you the severall signals present on the severall windings of the main coil and how the tuning of the frequency influences the resonance of the L2 coil.

Finally i pulsed the coax with HV pulses of a flyback to see what is happening on the L4 coil.

Video to be seen here: http://www.youtube.com/watch?v=RU15rQEV-Rg&feature=youtu.be

With a big thanks to verpies.   Now continuing with the building of the nano-pulser.

Regards Itsu.