John Bennett
Senior Member
Re: [ukvac] Re: MAMEing
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In article <8q7efh+ba4c@eGroups.com>, Dave Roberts <daverob@cwcom.net>
writes
>But the deflection of the electron beam in the tube is directly
>proportional to the current flowing in the windings. So to get the
>same sized image, you are going to have to push harder to get the
>current back up by increasing the voltage.
In a raster scan monitor the windings are already capable of achieving
full scale deflection. I suppose the definitive answer would be to get
an old monitor and hook a power amplifier and signal generator directly
to each of the deflection coils and run them at a few kHz. That could
produce some very interesting colourful Lissajous effect on screen if a
valid video source was being applied.
Better still, since you can scope an XY video feed, I suppose you could
bang it into two powerful audio amplifiers and give the coils a real
life test. A powerful stereo amplifier should handle this trick with
ease depending on the impedance of the yoke coils.
This sounds like a fun experiment for a UKVAC meet.
--
Clive Mitchell
DATA Imported from archives: originally posted by Clive Mitchell (clive@emanator.demon.co.uk)
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In article <8q7efh+ba4c@eGroups.com>, Dave Roberts <daverob@cwcom.net>
writes
>But the deflection of the electron beam in the tube is directly
>proportional to the current flowing in the windings. So to get the
>same sized image, you are going to have to push harder to get the
>current back up by increasing the voltage.
In a raster scan monitor the windings are already capable of achieving
full scale deflection. I suppose the definitive answer would be to get
an old monitor and hook a power amplifier and signal generator directly
to each of the deflection coils and run them at a few kHz. That could
produce some very interesting colourful Lissajous effect on screen if a
valid video source was being applied.
Better still, since you can scope an XY video feed, I suppose you could
bang it into two powerful audio amplifiers and give the coils a real
life test. A powerful stereo amplifier should handle this trick with
ease depending on the impedance of the yoke coils.
This sounds like a fun experiment for a UKVAC meet.
--
Clive Mitchell
DATA Imported from archives: originally posted by Clive Mitchell (clive@emanator.demon.co.uk)