Kapanadze Cousin - DALLY FREE ENERGY

[Hoppy]

I have attached a scope shot (x10 probe) taken collector to ground of an inverter MJL21194 transistor operating at 4.6KHz.

Current draw - 2.86A @ 12.3V. Output - 111.7V into a 1K resistive test load.

The transformer is a big mains toroid with 2 x 9.4A primaries.

I have used a P6KE30A (30V) transorbs with 33R series resistors for snubbers across C/E of each MJL21194. A smaller 24V transorb with 33R resistor is also fitted across the TL494 supply rail.

There is ringing on the waveform but I'm reasonably happy with it for this application. However, it is clear to me that given that Dally used bipolar transistors for his inverter, with the circuit as drawn, this would have not delivered very much power to a load irrespective of the transformer type. We need to see the full spec on the toroid transformer he used.

Regards
Hoppy

[verpies]

Current draw - 2.86A @ 12.3V. Output - 111.7V into a 1K resistive test load.

That's only 35% O/I efficiency
.

[verpies]

Here are the velocity factors of coaxial cables using these types of dielectrics:

Dielectric Type                        |    V_F
--------------------------------------------------
Solid Polyethylene (PE)             |    66
Foam Polyethylene (FE)            |    80
Foam Polystyrene (FS)              |    91
Air Space Polyethylene (ASP)    |    84 - 88
Solid Teflon (ST)                        |    69
Air Space Teflon (AST)               |    85 - 90

More coax data can be found here.

[Hoppy]

Measurements taken with L2 tuned to resonance at 4.63KHz with 4.7uf cap: -

Voltage across L1 taken with DVM - 101V.
Voltage across L2                         - 29V.
Voltage across L4                         - 12V (no load).

A sinusoidal waveform is displayed with a tuning cap of 1.5uF (shown on schematic) but this is off peak amplitude for my L2 coil.

How does the AT PSU work from 12V AC / 17V rectified and smoothed DC from L4. Answer - energy drawn up from the earth ground. 

Regards
Hoppy

[verpies]

Which schematic do you refer to, when you write this ?:

How does the AT PSU work from 12V AC / 17V rectified and smoothed DC from L4. Answer - energy drawn up from the earth ground.