Rosemary Ainslie circuit demonstration on Saturday March 12th 2011

[poynt99]

Looking forward to seeing some scope results of either the apparatus or any of the simulations pertaining to the above schematic, or any other.

Rose, I looked at the schematic and resulting wave forms you sent me of the conventional switcher using the 555, but I failed to see anything unusual there.

.99

[poynt99]

Here again, for those that may want to try this as a simulation or real build, is a version of this circuit that does not require a function generator. It self-oscillates simply by applying -5VDC of bias on a single MOSFET at its Source leg. The MUR160 diode replaces what was the Q1 MOSFET.

This is the circuit in its basic form.

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[Rosemary Ainslie]

Hi Poynty

I know someone who probably will try that circuit config of yours but we would both be glad to see the waveforms average voltage across the battery supply.  And does your sim do a product of the vbat Ishunt values?  If so - please show these too. 

I have got my computer back - and STILL can't get in.  It has to go back again.  Unbelievable.  Anyway I don't need it to upload the report so will do that later today.

Regards,
Rosemary

Edited for clarity.  This is becoming a habit.   

[poynt99]

Rose, PSpice can perform almost any type of computation.

Here are some wave forms you may find interesting for this self-oscillating version. What do you make of these results?

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[Rosemary Ainslie]

Poynty - IS THAT IT?  Does it work with the one MOSFET on a sim but not with TWO?  I can't understand that.  And what is that resistor doing at the positive terminal?  Is it a load or a shunt?

Poynty?  Are you equivocating?  Because if you're not then this is very exciting.

Kindest regards,
Rosie