DC on second DVC VC

mashaffer · 26th May 2006, 11:07 PM

I have been doing a lot of searching for info on parameter changes for different DVC setups and if I have read it all correctly parallel or series changes only impedence and I presume driving each coild from a seperate amp channel would also have no effect.

However it appears that one can vary the Qes between the dual coil value and 2 times the dual coil value by puting a resistor across one coil and driving the other. This got me to thinking that one should be able to push Qes farther in either direction by biasing the unused coil with a DC current. If the current were oriented in a way to increase the effective power of the magnet then the Qes should be driven even lower than when both VCs are driven with the audio signal. Is this correct? Would we not then have some of the advantages of a field coil design?

If I have it right then what is the down side (no free lunch)? Just power handling and efficiency?

mike

pinkmouse · 26th May 2006, 11:47 PM

Surely putting DC on one coil would just act to move the coil in or out of the gap? I can't see it affecting any other parameters to an extent that would justify the loss in Xmax.

mashaffer · 26th May 2006, 11:59 PM

Of course... brain fog is high today.

mike

26th May 2006, 11:07 PM	#1
mashaffer diyAudio Member Join Date: Jun 2004 Location: Indiana	DC on second DVC VC I have been doing a lot of searching for info on parameter changes for different DVC setups and if I have read it all correctly parallel or series changes only impedence and I presume driving each coild from a seperate amp channel would also have no effect. However it appears that one can vary the Qes between the dual coil value and 2 times the dual coil value by puting a resistor across one coil and driving the other. This got me to thinking that one should be able to push Qes farther in either direction by biasing the unused coil with a DC current. If the current were oriented in a way to increase the effective power of the magnet then the Qes should be driven even lower than when both VCs are driven with the audio signal. Is this correct? Would we not then have some of the advantages of a field coil design? If I have it right then what is the down side (no free lunch)? Just power handling and efficiency? mike

26th May 2006, 11:47 PM	#2
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	Surely putting DC on one coil would just act to move the coil in or out of the gap? I can't see it affecting any other parameters to an extent that would justify the loss in Xmax. __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

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26th May 2006, 11:59 PM	#3
mashaffer diyAudio Member Join Date: Jun 2004 Location: Indiana	Of course... brain fog is high today. mike

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