Author Topic: unipolar pulse trains  (Read 84401 times)

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Re: unipolar pulse trains
« Reply #248 on: April 13, 2009, 01:12:23 am »
Question:

you show in your scope shot, the 50% duty cycle at the bottom, and your pulses on the top, are you sure this is double frequency?

Looking closer you have a "low-high" on the bottom, for each tall "pulse". so if you count the "high's" from the bottom, and the tall pulses, you get the same amount.

Each tall "pulse" is twice as wide as each "low" or "high", so i am confused, what would the relationship be if it was not a "double" pulse frequency.

Can you explain what is going on here a little bit better for me, I am eager to learn.

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Re: unipolar pulse trains
« Reply #249 on: April 13, 2009, 01:16:32 am »
dankie i gladly will.

you are correct about opposing fields.

but you are wrong about the connections.

it is the electron flow that is to be focused on......hence electron bounce phenomenon

once again.....you are correct about the opposing fields......but wrong about the connections.....your connections will not cuase opposition amongst potential energy.

electons flow in the opposite direction of current.

this has to help you......NOW IMAGINE A DIODE IN THE CIRCUIT LIKE THE IN VIC WHEN THE ELECTRON IS TRAVELING ......TELL ME WHAT WOULD HAPPEN?...BOUNCING AND A BUILD UP IN OPPOSITION!

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Re: unipolar pulse trains
« Reply #250 on: April 13, 2009, 01:20:40 am »
The circuitboard, as far as i can remember,  is nothing more then a squarewave generator.50% duty fixed.
No gating options at all.

br
Steve

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Re: unipolar pulse trains
« Reply #251 on: April 13, 2009, 01:21:53 am »
alright donald here is what happens......on teh 50 percent duty cycly sent into the inductor it creates a magnetic field......then when the 50% duty cycle is shut off the magnetic field collapses and the diode forces that energy to be sent towards the cell (or in this case my probe)....this would give me a double pulse.....one on the on and one on the off.......look at the first scope shot i posted.....it shows it much much clearer....it is an inductive kick......there is no bottom to the double pulses.....the wave form is now DC.....it is no longer AC.....it is the same concept as taking a sine wave (or 50% duty cycle square pulse) and sending it through a bridge rectifier which would created a unipolar pulse or DC......

this is how alternators work in a car to create dc....but that is sent into a cap to smooth it out.

does that explain it?...if you still do not understand please let me know.

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Re: unipolar pulse trains
« Reply #252 on: April 13, 2009, 01:28:05 am »
well i think that generator was used also for gating......as stated here:

(http://i2.photobucket.com/albums/y2/kinesisfilms/gatingcircuitpulse.jpg)

if you notice in the circuit diagram it says to 8XA and not 8XA1.......that circuit might only be used to gate......and not for hte primary signal......but if you built it i would be interested in knowing if you can do test with it.

EDIT: stevie i did not mean that the generator had gating options...i meant was it used for gating as in the above image?

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Re: unipolar pulse trains
« Reply #254 on: April 13, 2009, 01:41:01 am »
Thanks, I see on your first one a double frequency, there is a pulse for the "on" and one for the "off", on your second scope shot, there appears to be the same pulse frequency, but it it double-width ?


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Re: unipolar pulse trains
« Reply #255 on: April 13, 2009, 01:42:53 am »
On another note, it appears Stan likes to show his pulse generator and his gate generator as separate circuits, this could be combined, like the Jolt circuit, or it could be done separately.