Curious.? Unless you need a very different X rate, why rewind the yoke?
Harvey
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On 11/3/2021 8:42 PM, toby@... wrote:
On 2021-11-03 7:51 p.m., Harvey White wrote:
That's not how you do it.? What you do is read the current through the deflection coil, compare it to your waveform, and then the difference drives the deflection amplifier.? One classic way yields a driving waveform at the TV horizontal frequency that is two pulses with a linear (more or less) rise between them (IIRC).
What you want is a linear /current/? for a linear sweep.
I think that's what Roy meant with 'drive with current instead of voltage'.
Rewinding one half of the yoke is necessary anyway, from what I have gathered reading/watching these conversions.
--T
With electrostatic plates, what you see is what you get.
Harvey
On 11/3/2021 5:56 PM, Roy Thistle wrote:
On Wed, Nov? 3, 2021 at 12:27 PM, Jeff Dutky wrote:
magnetic deflection CRT which, if I recall my college physics correctly (no
guarantee at this late date) has lower deflection bandwidth
Hi Jeff:
Well... you'd be trying to drive an inductor (the deflection field coil, in the CRT yoke.)... and in this case Lenz is no friend to you.
I believe I have seen a vector display with magnetic deflection... I believe it is possible.
You could change the resistor, in the yoke, to fiddle with the time constant.., drive with current instead of voltage... wind/rewind a/the custom/deflection coil...or if you want a bandwidth of more than a few 10s of KHz... use use electrostatic deflection.
Cheers and all that too.
