Re: Quasi-interesting CRT puzzler


"Eeyore" <rabbitsfriendsandrelations@xxxxxxxxxxxxxxxxxxxxxx> wrote in
message news:44E46A29.317611E2@xxxxxxxxxxxxxxxxxxxxxxxxx


Ancient_Hacker wrote:

Okay, this is kind of a retarded question, but here goes.>> Then you hook
up a DC supply to the V and H yoke coils and find out it
takes about 3 AMPS to do a full screen deflection in the vertical
direction, about TEN amps in the horizontal direction.

(I think that's because the horizontal deflection has to happen faster,
therfore lower inductance in the h coil, therefore fewer gausses per
amp).

So we need some pretty hefty drivers, many amps plus many volts if we
want fast deflection.

Ideally I'd like to be able to draw 6000 full length vectors per
second.

A quick web search didnt find anything promising.

I one worked on a spiral scan CRT system for radar. That was fun !

Graham


Tuned deflection coils, more efficient use of power?

I worked on a radar display in the early 70's that used deflection coils of
around 10uH total. We used a class A push-pull output stage with
centre-tapped coils and a series inductor. We got around 5MHz small signal
bandwidth. The energy stored in the inductor provided the high voltage
needed for fast transitions of the beam. The system could display a 625 line
TV picture and write all over it with vectors and characters in the vertical
flyback period. Problem - 800 watts per axis!

Graham H


.

Relevant Pages

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