[Amps] A thought about regulating fil voltage...

[Will Matney]

Jos,

Actually there is benefits from running DC on the heater I have read 
about. It would be easy to regulate like your talking of. The low 
current is a big plus.

Best & 73's

Will Matney



hermans wrote:

>Hello Roy & Will,
>
>Could there be a relationship between your night vision and my dream of
>UFO's last night.......!
>BTW I'll go for a regulated DC filament supply. Fortunately the indirect
>heater of a GU84b  is 27V @ 3.5 A 
>
>Have fun.
>
>73 Jos
>
>-----Message d'origine-----
>De : amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] De
>la part de Will Matney
>Envoyé : samedi 30 octobre 2004 0:31
>À : amps at contesting.com
>Objet : Re: [Amps] A thought about regulating fil voltage...
>
>Roy,
>
>I take it your talking about an AC shunt regulator using two zener 
>diodes back to back? If so, it would work providing the zeners watt 
>rating was large enough.
>
>Will Matney
>
>Roy Koeppe wrote:
>
>  
>
>>the easy way??
>>
>>It came to mind that two series strings of hefty, stud-mounted, low
>>voltage diodes could be installed back to back polarity across the
>>filament, effectively acting as a shunt regulator (ahead of the
>>    
>>
>filament
>  
>
>>choke in case of GG service). Without the diodes in the circuit,
>>    
>>
>voltage
>  
>
>>would preliminarily adjusted to slightly higher than normal. Then the
>>proper shunt diodes would be installed to clamp it down to the correct
>>value. Ideally not much current would flow into the diodes, maybe on
>>order of a few amps. The diodes would be RF bypassed.
>>
>>Now, when you key up the idling current, and more so the full RF drive,
>>filament voltage could thus be stabilized.
>>
>>
>>I have not tried it--I just saw it in a 'night vision'.
>>
>>Thoughts please.
>>
>>73,     Roy          K6XK/0
>>
>>
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>>
>>    
>>
>
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