Kapanadze Cousin - DALLY FREE ENERGY

[verpies]

finally got my 74HCT00's, so build the VCO and nano-pulser.

I like what you have done with that blue capacitor

[verpies]

Now the most difficult part is ahead of you. The driver for the DSR Diode and the diode itself.

The 74HC00 is fine for the monostable multivibrator but 74F00 or 74S00 would have been better because of their shorter propagation delay.
I don't understand why Dally calls the monostable circuit  a "nanopulser", if it outputs pulses that are 100s x wider than a nanosecond pulse.
The DSR Diode circuit is the actual "nanopulser", not the 74xx00 monostable.

Important advice: Make the monostable pulse width adjustable between 100ns and 500ns because the DSR Diodes work in that forward pumping pulse width range.

If this was not a replication of somebody's design, I would use another TL494 for the kHz VCO because it is more versatile and has stronger outputs. ...or better yet, one MAX5069 for the kHz VCO and the monostable, instead of the two 74xx00 ICs containing 8 NAND Gates for mickey-mouse logic.

The fast transistor driving the Tr1 primary shouldn't be hard to obtain. However the DSR Diode will be

The Tr1 core might be hard to match too (especially its saturation point), but maybe you will get lucky with that.  This difficulty is the reason why I am a proponent of driving the DSRD without a transformer and without ferrite cores.

P.S.
As always there are never too many parallel bypass capacitors on the supply rails and you might even insert ferrite beads or thick wire chokes wound on ferrite cores before the voltage regulators (in series), because once the DSR Diode starts kicking you will have a lot of nasty EMI.

[d3x0r]

Revisited my pulser circuit, I found several connections reversed, and one shifted by a pin, now mine works with adjustable frequency and yields basically the same result as Itsu   Although I can't seem to go quite so low in frequency...

[mihai.isteniuc]

The nanopulse coming out of the pulser can be varied between 6Khz till 372Khz.
The width is 334ns at 5V.

Confirmed.

A friend of mine give me a russian K155LA3. Freqvency can be varied at list with this one from 4.2khz up to 410khz

Mihai

[itsu]

@ d3x0r,    ok,  way to go 

@ mihai.isteniuc,  thanks for confirmation.

@ verpies,

Now the most difficult part is ahead of you.

Thanks for the advices.


@ All,

for the nano-pulse part i aimed for the circuit as mentioned by "Сергей Ð'." in his post #93 (see below) as it contains the most common parts.
However, my nano-pulse has flipped over to a non-nano-pulse (meaning inverted) when feeding to the gate of the IRFU320.
So i have a constant  14V on the gate (opening the MOSFET), and then nano width pulses to ground (closing the MOSFET).
This looks reversed from what it should be, right?
Is this a design flaw, am i not thinking right, or did i make a mistake somewhere?    Any thoughts, suggestions?

Regards Itsu