Kapanadze Cousin - DALLY FREE ENERGY

[Vortex1]

The diode Kd203 in the prior schematic is not connected in avalanche mode.

Also the supply is only 150 volts, not nearly enough to avalanche a 420/600 volt device.

The KT926 is the more likely avalanche candidate, possibly being triggered by base drive.

Probably the KT926 is just used in common emitter amplifier mode, being driven by logic gate, after all, it is a 200 Volt device.

[Hoppy]

The diode Kd203 in the prior schematic is not connected in avalanche mode.

Also the supply is only 150 volts, not nearly enough to avalanche a 420/600 volt device.

The KT926 is the more likely avalanche candidate, possibly being triggered by base drive.

Probably the KT926 is just used in common emitter amplifier mode, being driven by logic gate, after all, it is a 200 Volt device.

Vortex,

The pulse transformer TR1 is step-up 6T:12T, so the voltage across the rectifier should be well in excess of 150V?

Hoppy

[Vortex1]

Vortex,

The pulse transformer TR1 is step-up 6T:12T, so the voltage across the rectifier should be well in excess of 150V?

Hoppy

The diode on the W1 side of Tr1 is certainly not connected in avalanche mode, and the diode on the W2 side is still well within the rating even with 1:2 step up of the 150 volt supply.

My guess is that these diodes are placed to clamp negative ringing of inductance since there is not nearly enough voltage available for avalanche (>600 V).

[Black_Bird]

@hoppy, @vortex1
Probably the diode is there to clamp the negative going pulse that is reflected back from the shorted coaxial cable, and also to clamp the negative ringing from the inductor, keeping the input pulse always positive.

I was not aware of the DSRD technique below. Obviously,  what I said above makes little sense in view of the DSRDs.

[Hoppy]

The diode on the W1 side of Tr1 is certainly not connected in avalanche mode, and the diode on the W2 side is still well within the rating even with 1:2 step up of the 150 volt supply.

My guess is that these diodes are placed to clamp negative ringing of inductance since there is not nearly enough voltage available for avalanche (>600 V).

I will need to check this when I power up coil. Is the KD203 fast enough to clamp the ringing? The pulse rate is around 450KHz with the specified 1nF VCO timing caps - changed from 100nF on latest schematic posted. With 100nf caps, the VCO cab be adjusted to run at the magic 4.6KHz. What value did Dally use - I suspect 100nF.

Hoppy