Now... here's some info for Rosemary.

In all the scope shots that show POSITIVE gate drive pulses WITH oscillations on the more negative portion..... the FG is actually supplying a bipolar pulse with a substantial negative-going component in the "off" period. This causes the oscillations in the normal manner that we have been discussing here by supplying a negative bias to the Q2 sources.
And here's the clincher: You cannot do this with a simple 555 timer. You can make the positive pulses just fine... but you can't provide the negative offset required to make the oscillations during the "off" part of the 555's cycle. Not with a simple 555 timer. It will require more complex circuitry than that... essentially a function generator itself.
And.... you cannot even use a simple 555 timer to make the strictly NEGATIVE going bias unless it is powered by either an external power source that is floating OR.... through a charge pump inverter as I have shown... by the circuit's main batteries themselves.

Boo hoo hoo. Maybe that's why you haven't been able to show your circuit jumping through hoops using a simple 555 timer circuit.


But Tar Baby can, using a bit more complex circuit.


Of course this FG and 555 talk is all MOOT anyway, since the requirement is for straight DC negative gate drive using the main battery. Which I have of course also already demonstrated, making a negative power product and a decreasing net energy integral.

Quote from: poynt99 on April 30, 2012, 12:06:54 PM
My guess is (and I posted this also back some time ago) was that Rosemary made an error, and mixed up the model numbers of the FG and the scope. The scope they used is a LeCroy 324 WaveJet.

So the GFG part may be correct.

@All,

I just got off the phone with a LeCroy 'scope application engineer in New York.  The offest numbers on the LeCroy are exactly as "most" of us thought they were.  They merely indicate the vertical distance of a channel's zero reference line from the horizontal center of the graticule. 

I stand by my assertions regarding Q1, and again, frankly, I don't really care about it anymore.

For those in doubt, it's just a fact, get over it.

PW

Quote from: TinselKoala on April 30, 2012, 02:00:56 PM
Good for you, PW !!

What you describe is very similar to what happened to me. I was one of those little kids ! Well, I was a little bit older, I think, but the neighbor across the street did something very similar for the kids in our neighborhood. He was packaging and selling little electronic kits, among which was a crystal radio. He showed me a lot of stuff that I still remember today. Who could have thought that simply putting a loose loudspeaker (for my one-tube radio) into a box could improve the sound so much? My father especially was amazed.

TK,

The guy that got me started had a hook for a hand from an industrial accident (the mechanics of his hook actually fascinated me).  Showed me some circuit's on his bench, gave me about 150 back issues of Pop 'tronics and Pop Sci' and some parts to experiment with.

I believe everyone should try to maintain this tradition of "passing it along" as best they can.

PW

Well I see it was another "Who's afraid of Virginia Woolf" kind of day.  Enough to make one want to take a vacation.  Rosemary's "explanation" of the function generator current flow issue was classic Rosemary.  Where is Joit when you need him?

To be a fly on the wall when she does her own dim light bulb test would be interesting.  However, just like if a tree falls in the forest... Can a dim light bulb see a dim light bulb?  Hmmmm   

Draw up a proper diagram of the current flow Rosemary and post it because your hopeless technical English skills are like a proverbial ball and chain.

Makes a grown man cry and a dead man sum up all of his voltage slices.  Ouch!

MileHigh

Quote from: poynt99 on April 30, 2012, 11:36:54 AM
Can or does current pass to or from the function generator (FG) in the NERD circuit? Evidence from the simulation indicates that it does. See attached.

Poynt.  I can't follow your argument.  I understood that high frequencies increase impedance - NOT lower it.  And why do you think that the oscillations 'stop' when you use the 50R as appropriate?  And more to the point.  We have a steady state DC applied for upwards of 2 minutes - during which the oscillation persists.  Impedance is not a factor when there's a DC current applied.

Here's your schematic again.