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What is typical deflection yoke current for full displacement?

full scale displacement of the dot? Are we talking

deflection circuitry specs around 3A p-p. Does the

a sweep?

Peaks of 1.5A for the vertical coil are about right. For the horizontal coil, multiply by 10 to 30. Yes, it takes a lot of current.

as an oscilloscope given the limitations of the

high voltage and slew op-amps. It's not looking too

adjustments and has no bells and whistles - with a

You would be lucky to get that kind of bandwidth. Have you measured the inductance yet?

expected a high performance scope...

For the same bandwidth, it would probably cost less to capture digitally, then display the result as a raster scanned image.

--
--Larry Brasfield
email: donotspam_larry_brasfield@hotmail.com
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Larry Brasfield
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Just curious how much current is required in the deflection yoke coil for a full scale displacement of the dot? Are we talking in the mA or A range for a typical - let say ~20" - tube? I've seen vertical deflection circuitry specs around 3A p-p. Does the yolk really require this much current to reach full scale dot displacement for a sweep?

Trying to get a rough guestimate of measurement bandwidth should I use the TV as an oscilloscope given the limitations of the voltage to current circuitry. Was going to implement V to I circuitry using high voltage and slew op-amps. It's not looking too hot - those coils really screw you. A TV oscope - that makes no linearity adjustments and has no bells and whistles - with a bandwidth in the 10's to 100's kHz is pretty crappy. If the yoke current range is in the amp range, I'm really hosed - not that I expected a high performance scope...

Thanks,

Monty

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Monty Hall

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