Rosemary Ainslie circuit demonstration on Saturday March 12th 2011

[neptune]

Hi Nul-points, and Greetings from Lincolnshire in the cold misty North of England . You are preaching to the converted , so to speak, in that I agree 100% with your last post .We must leave no stone unturned . The 9 volt battery and pot idea is a simple cheap starting point . As Rosemary says this effect is not frequency dependent , mechanical switching becomes possible for experiment . Rose talks about frequencies as low as one cycle every 3 seconds!. If the constant neg bias does not work , we could use two battery and pot circuits to pulse the gate pos and neg alternately using a microswitch to change them over .Microswitch could be operated with a variable speed DC motor driving a cam , or you could even operate it with a pendulum .These methods might be easier for some than 555 circuits which normally only pulse between pos and zero .With two bias batteries , you could vary the voltage of pos and neg pulses independently . My point is that experimentation at this level could be cheap .Not everyone has a function generator

[neptune]

Just read the article linked bykEho77 in reply number385 , and also the one linked by rensseak in reply388 . We can learn much from these .For a start , if we can not get the circuit to oscillate , try different wire lengths on the gate connections . If driving the gate with a pulse generator , a potentiometer of 100 ohms to 1Kohms between the generator and gate is desirable . Further study needed here . There is talk of the gate wiring acting as an aerial .Is this the purpose of the aerial, picking up electronic noise ,on Ismael Avisos car ?

[Rosemary Ainslie]

Right, Part 2 then.

What will happen to our PVbat calculation if rather than using this agreed upon equation:

PVbat = V(P1 - P4) x V(P3 - P4)/0.25

we make a small change and use this instead:



PVbat = V(P2 - P4) x V(P3 -P4)/0.25

What happens to the PVbat calculation?

.99

Ok.  Poynty Point.  Still struggling to find relevance here.

"PVbat = V(P2 - P4) x V(P3 -P4)/0.25" refers.

Actually I'm going to change this entirely.  You tell me.  And this time look at the entire circuit assuming R = 1 Ohm.  What is the current flow here?  And how do you calculate this?  Then.  What is the current flow at R2 given that R = 1000 Ohms and what is the current flow at R3 given that R = 0.25 Ohm.

Let us know Poynty.

Kind regards
Rosemary

CHANGED 

[Rosemary Ainslie]

And guys, the switch is now switching like an angel but I can't get any power through to the load.  I think we've shaken a cable loose and I can't, myself, get in there.  I'll try and get someone to fix this tomorrow. 

Sorry about the delay Poynty.  The probes still positioned as required.  Hang fire.  We'll get there. 

Kindest as ever,
Rosemary

BTW - Many thanks for the good wishes Atomicx.  But the credit is not mine - I assure you.  The team rallied with that demo.  I was just a spectator.

Kindest as ever,
R

And rensseak and nul-points - nice references and nice points.  I also have no idea how that oscillation is actually triggered.  It was a big surprise.  But it seems to just want to keep going.  And there's no question that there's some heavy duty current there.  It shows up in the battery voltage drop - and climb.  But I still have to show that with the probe directly across a 24 volt supply. 

And another point for our Poynty.  I can't span a 12 volt battery.  I made a mistake.  The best I can do here is 24.  But that should do the trick - presumably.  I'll keep those connections to the barest minimum.  And I'll film it.  So you'll see where the probes are positioned. 

Again,
Rosemary 

[Rosemary Ainslie]

Rose talks about frequencies as low as one cycle every 3 seconds!.

Neptune?  I'll see if I can find that scope shot.  It's not one cycle per 3 seconds.  It's actually one cycle per 2.7 MINUTES at the lowest setting.  I'll see if I can find it to post it.  Actually just recalculated this.  More like 2.5 minutes.  But that's still a long time.  And no evident ringing down or up at each transition.

Hang 10. I'll see what I can do.  Not the best around this internet thing.

I think this is it.  Here's hoping.  Yes.  Just look at the 50sec per division in the top left hand corner. 

Kindest, as ever,
Rosie

edited