TK,

Possibly we were cross posting.  My second post explains the AC current path...

PW

Quote from: picowatt on July 03, 2012, 11:45:18 AM
TK,

Possibly we were cross posting.  My second post explains the AC current path...

PW

Yep.

I've avoided discussion of the capacitances passing the AC-- because Ainslie has absolutely NO understanding of capacitors, what they are, how they work, or how they are used in a circuit. She grasps -- barely -- that they are energy storage devices and can be used like a battery... but as far as storage of energy in electric fields, displacement currents, AC passing and DC blocking.... filtering, RLC circuits, all of that..... she wasn't in school the month they covered capacitors in her "circuits devices and systems" class.

If you think the operation of transistors and inductors and test equipment gets mangled by the Ainslie shredder brain, wait until you start trying to discuss capacitors and capacitance with her. She does not even grasp DC circuit behavior with a single loop and only a resistor, much less AC with capacitors and multiple paths.

Quote from: TinselKoala on July 03, 2012, 11:52:22 AM
Yep.

I've avoided discussion of the capacitances passing the AC-- because Ainslie has absolutely NO understanding of capacitors, what they are, how they work, or how they are used in a circuit. She grasps -- barely -- that they are energy storage devices and can be used like a battery... but as far as storage of energy in electric fields, displacement currents, AC passing and DC blocking.... filtering, RLC circuits, all of that..... she wasn't in school the month they covered capacitors in her "circuits devices and systems" class.

If you think the operation of transistors and inductors and test equipment gets mangled by the Ainslie shredder brain, wait until you start trying to discuss capacitors and capacitance with her. She does not even grasp DC circuit behavior with a single loop and only a resistor, much less AC with capacitors and multiple paths.

TK,

Yes, as I said in an earlier post, I doubt she will allow herself to ever grasp the DC conditions when Q2 is turned on, let alone understand the AC conditions.  However, as one of the posters "over there" asked a question regarding how it is possible she can claim Q2 is somehow floating or disconnected from the battery during the oscillations, I thought any readers from "over there" might appreciate an explanation of the "mysterious" AC and DC current paths.

Possibly .99 could post the explanations over there for Greg, with any modifications he deems appropriate.

PW

 

Ah yes, the first chink in the armour appears: Ainslie claims the Q2 source is "floating" without understanding that that term has a precise technical meaning which she is not respecting, or, if she IS using it in its precise technical meaning, is simply WRONG yet again.

And her current builder is asking questions about it and challenging her on it.

And there will be more questions as his work continues. I can't wait to see what happens when he tries to repeat that 12 volts to the gate of Q1 without having any current flowing through it.

Here is the schematic for "Manny" the manual mosfet relay driver/oscillator, so far, as developed and demonstrated in the last several videos. I am really lousy at schematic layout; it is really not as complicated as it looks. I hope I've drawn it out correctly, at least.

I hope it is clear to the readers what I am doing here.

By using a double-pole double throw relay and the correct reservoir capacitor and charging-discharging trimpots, one can use this circuit to control another circuit that requires alternate application of voltages at long arbitrary duty cycles.

In other words, I have again implemented one of the suggested means of driving the NERD circuit without the use of an expensive and delicate FG or even a mysterious 555 timer, to produce both the Q1 ON high heat mode and the Q2 magic oscillation modes of operation, with virtually any duty cycle desired, for about 12 dollars in parts. That is, I am still doing the NERD "team's" homework for them and publishing it freely as it happens.