On 9/30/05, philpem@dsl.pipex.com <philpem@dsl.pipex.com> wrote:
> Hi folks,
>   I'm trying to design a HV power supply to drive a DG7-32 CRT tube. I need
> the following outputs:
>     +6V AC/DC - heater supply. Isolated from everything else. 300mA
> minimum.

   suggesting DC filtered supply, will be much easy if will be
generated by a switching filtered supply


>     +400V DC  - deflection amplifiers

  usually this need at least 20-50mA and need to be well filtered. The
current is as high as higher would be the scope bandwith.


>     +300V DC  - CRT anode
>     -300V DC  - brightness and focus control
>     -200V DC  - cathode
 don't forget the shut down circuitry for  the reversal movement of the spot

 try the same methode used by a TV or CRT HV supply, one transformer for all.


cheers,
Vasile
>
>   Basically, what I want is something like the power supply circuit at
> <http://www.webx.dk/oz2cpu/clock-scope/scope.htm> but without the huge mains
> transformer. Ideally I want to run it off a 12V (or thereabouts) supply -
> i.e. a rechargeable battery pack (probably NiMH but equally likely a 14.4V
> 2AH Li-ion).
>
>   Does anyone have any suggestions? I was thinking of using a switchmode
> supply for the HV, but I haven't heard of any decent books or webpages that
> cover HV switcher design. Current requirements for the HVs are pretty meagre
> - less than 10mA total. The big problem is the 6V heater supply that needs
> to be isolated from (at the very least) the HVs.
>
> ('scuse the "posted by Oakmailer" tag; I'm sending this through webmail and
> Oakmailer insists on tagging outbound mail)
>
> Thanks,
> Phil.
>
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