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Projects by members => Projects by members => Tony Woodside => Topic started by: TonyWoodside on March 30, 2011, 06:37:50 am
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This is the video I made of the Stan's "Resonant Scanning Circuit" that I build based on the VIC card. Works really nice.
http://www.youtube.com/watch?v=47n1YfpL4Qc (http://www.youtube.com/watch?v=47n1YfpL4Qc)
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neat stuff rite there 8)
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thats great man, i'm glad someone has the skills to do this! it be great if you figured out the entire card.
are you planning on releasing the schematics?
anyway your making huge steps forward! keep up the good work
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Dave,
I second the motion! Please let us know the details when you get a chance!
Tony, quick question on the resonant scanning circuit from the patent - Q14 and Q15 are not labeled.
Did you use a specific transistor for these, or an IC?
Great work, thanks!
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Dave,
I second the motion! Please let us know the details when you get a chance!
Tony, quick question on the resonant scanning circuit from the patent - Q14 and Q15 are not labeled.
Did you use a specific transistor for these, or an IC?
Great work, thanks!
Yes, the IC Stan used was a CD4016BCN
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Tony I watched your video on the scaning circuit,and I can tell you that it is not right.Your scope shows the voltage rising and falling,and not the frequency changing.Now I don't know where your taking the measurements from,but if it's right out of the scanning circuit before the primary,it not right.
When the scanning circuit is running ,you should see the frequency expand and contract horizontaly and not verticaly.
All I see is the voltage rising and falling,and not the frequency.
Don
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you should see at the pin 9 of the pll a sine, ramp or exponential wave, of the frequency of the scanning you set, like dynodon said.
cheers
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Tony I watched your video on the scaning circuit,and I can tell you that it is not right.Your scope shows the voltage rising and falling,and not the frequency changing.Now I don't know where your taking the measurements from,but if it's right out of the scanning circuit before the primary,it not right.
When the scanning circuit is running ,you should see the frequency expand and contract horizontaly and not verticaly.
All I see is the voltage rising and falling,and not the frequency.
Don
yea that scope shot is of the scanning circuit only, which it connects to the VCO of the PLL. The output of the PLL expands and contracts due to the rise and fall of the scanning circuits voltage. All the scanning cir circuit is doing is making the voltage rise and fall and once its connected to the PLL, the PLL will translate the rising and falling of the voltage to a frequency range as set by the POT on the PLL chip. So at the output of the PLL it is expanding and contracting horizontally as the frequency is being changed, so its operating correctly.
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Heres what the output signal to the primary coil of the complete circuit looks like. As you can see I have it set in the automatic scan mode.
http://www.youtube.com/watch?v=N9xQL_F_bUk
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Tony, that looks better,but it's a little too fast and pauses too long at each end of the scan.
But it looks good.
Don
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Yea I noticed the pause also, not sure whats up with that. In the card pic there's a 22k ohms resistor in parallel with the 10uF cap on the 741, maybe this resistor is the reason for the pause.
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Tonny, if you put the oscilloscope across the leads of the primary you should see the pulse incoming than when the pulse is off (at resonance) you will see a second positive pulse (double frequency). Look like a full wave rectified pulse even if you are only applying 1 pulse. much like in his pictures where you see a full wave rectiied signal going to the primary.
I'm working on a bigger coil witch i'm going to finish today, i have made the bobbins out of a pice of nylon and now i'm going to use the winding machine to make the bobbins. I'm going to use 28awg wire, The bobbins are gigantic there is a big window. My intention is to pulse it with low voltage high amperage lets say 12v 20A so i can have a high transformation factor, Cause the voltage seeing in the switch during the off pulse will be = to the resonant voltage divided by the transformation factor, so the switch must handle kv. I'm burning tens of mosfets here. When the resonance is achieved and we put power into it the thing the mosfet works better. I have only 600v warp speed igbts high amperage so i think is the only one that will fit the job. I also have a high voltage hexfet 1000v but is rated only 6 amps--- high rds on
I'm pretty much sure the pll purpose is also to achieve soft switching (quasi-resonance). Could be achieved with pwm but i don't know how to do it. I think that dan danford design was based in this.
I have designed my pll to run at 5v level and the driver at -5+0+12 volt level so the 0 goes to the source this way the gate will reverse the voltage improving the switch speed. This improved a lot the circuit performance. However i'm burning many components like drivers and the voltage regulators, seems like the high voltage pulse is going thru the voltage regulators.
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Question for Don or anyone - in Don's diagram, it shows 10v input on the circuit.
It there a 10v source, or is this 12V? Also, what is vee? vcc=5v, vdd=12v?
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Look at your new pictures and you will see there is a 10 volt power with the 5 volt power board.
I think Tony has it right when he said that the VEE could be the keyed power.
Don