Claimed OU circuit of Rosemary Ainslie

[fuzzytomcat]

Hi Guys,

Just my 2cents.
I have beadboarded the Quantum's paper 555 timer CirCuiT.

It works fine. I can read (at pin 3) the less than 4% duty cycle with
a freq. of  2.4 khz. Of course, I have to swap the probes of my scope
(and the probes of my freq meter) to see these results....

I mean: IMHO - and if I'm not mistaken - the Quantum 555 CCT
does *not* give the claimed results but just the opposite
as initially stated by NikolaTesla mingled (TK)....
My 555 circuit also  "generates (at pin 3) long, not short, ON times".

Now, some guys are telling that the Quantum 555 CCT actually works as claimed =
generates short not long ON times (at pin 3? with the probes correctly wired?)
I'm lost.... I guess I will have another drink.

Anyway, an extra 2N2222 (or similar) at pin 3 should inverse the wave.
Should it not?

BTW I have ordered some  IRFPG50.
http://www.awatronic.fr/index.php?_a=viewProd&productId=20219&added=1

Now, What about this circuit???  Sounds familiar. No?
Are the maths right?
More, In French (sorry) on : http://freenrg.info/Misc/FR_Zoltan_ZPE_Circuit/

Very Best

Hi NerzhDishual,

I really liked your link added a English version .......

http://translate.google.com/translate?u=http://freenrg.info/Misc/FR_Zoltan_ZPE_Circuit/&sl=fr&tl=en&hl=en&ie=UTF-8

Thanks
Fuzzy

[NerzhDishual]

Hi FuzzyTomcat,

Thanks.
The google translation is not so bad...

I was expecting some Jean-Loup Chiflet's "Sky English"

Basically, Jean-Loup Chiflet, the author, translates word-for-word French expressions and then gives the actual meaning... Funny and useful...

Few examples:
Poser un lapin [To put down a rabbit] - To stand someone up
Ca ne court pas les rues [It doesn't run the streets] - To be rare
Rien à cirer [nothing to polish] - Not to give a damn
Un nom à coucher dehors [A name to sleep outside] - An impossible name

Very Best

[TinselKoala]

I mean like look at the animation at the top of the first link. See that sawtooth waveform on the upper left?

In the first link, look at the "Duty Cycle <50%" diagram. There's a diode there.

I just tried shorting my diodes with a bit of wire while the 555 circuit is running.
Guess what.....



It makes a miniscule difference in the freq and duty cycle. Much less than I would have predicted.

[0c]

I just tried shorting my diodes with a bit of wire while the 555 circuit is running.
Guess what.....

It makes a miniscule difference in the freq and duty cycle. Much less than I would have predicted.

And you're sure you shorted where you should have shorted? Instead of shorted where you should have cut (opened)?

(Hey, if my comments are nonsense, just ignore me. As far as I'm concerned, those 'trons are mystical beings that do whatever they please anyway.)

[TinselKoala]

Hi Guys,

Just my 2cents.
I have beadboarded the Quantum's paper 555 timer CirCuiT.

It works fine. I can read (at pin 3) the less than 4% duty cycle with
a freq. of  2.4 khz. Of course, I have to swap the probes of my scope
(and the probes of my freq meter) to see these results....

I mean: IMHO - and if I'm not mistaken - the Quantum 555 CCT
does *not* give the claimed results but just the opposite
as initially stated by NikolaTesla mingled (TK)....
My 555 circuit also  "generates (at pin 3) long, not short, ON times".

Now, some guys are telling that the Quantum 555 CCT actually works as claimed =
generates short not long ON times (at pin 3? with the probes correctly wired?)
I'm lost.... I guess I will have another drink.

Anyway, an extra 2N2222 (or similar) at pin 3 should inverse the wave.
Should it not?

BTW I have ordered some  IRFPG50.
http://www.awatronic.fr/index.php?_a=viewProd&productId=20219&added=1

Now, What about this circuit???  Sounds familiar. No?
Are the maths right?
More, In French (sorry) on : http://freenrg.info/Misc/FR_Zoltan_ZPE_Circuit/

Very Best

Hey, Nertz. Thanks for doing that--have a drink on me!

I've finally gotten around to running some comparisons between the IRFPG50 and the 2SK1548.
Heh.
From a "traditional engineering" viewpoint the 2sk1548 diode performs MUCH better in this circuit...that is, if things like THD and proper pulse tracking concern you. The long turn off time of the IRFPG50 really messes with the signal at these excessively short (using the FG) or LONG (using the 555) duty cycles.
The IRF unit does seem to heat up less than the 2SK, but that's just an early impression.
I think if you are into spikes in your signal, the 2SK might be a better choice here too. It turns on and off better than the IRF unit (not surprising, is it, looking at the data sheets and considering the gate capacitances). And since it turns on and off with faster rise and fall times, it produces a higher inductive pulse from the coil. I think. Maybe.

So there goes my hypothesis that the two transistors would perform pretty much the same. I was wrong about that. The 2SK1548, when properly cooled, outperforms the IRFPG50, as far as I can tell. And it's smaller. And quite a bit cheaper. And locally available.