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What would be your requirements for a discrete saw wave generator?
What would be your requirements for a discrete saw wave generator?
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Old 29th August 2008, 04:35 PM   #11
Wavebourn is offline Wavebourn  United States
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What would be your requirements for a discrete saw wave generator?
In case of CRT you have to optimize the whole system: electrical, magnetical, and geometrical.

I.e. yoiur oscillator drives coils that deflect the ray that makes a spot on the surface that is not ideally spherical.
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Old 29th August 2008, 05:01 PM   #12
Mooly is offline Mooly  United Kingdom
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What would be your requirements for a discrete saw wave generator?
Sorry to bring doom and gloom but you will never do it. The deflection currents for a CRT are not linear but are modified to allow for correction of geometry. At the most basic level you need to introduce N-S and E-W correction as well as pincushion correction. All done by modifying the line and field current in the deflection yoke away from the ideal sawtooth.
I would suggest you read up on television receiver theory.
You image "enlarges" on bright scenes because the EHT drops due to poor regulation. As the EHT falls the electron beam becomes easier to deflect so the picture goes bigger.
Try something less ambitious
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