[R-390] OT: 30V regulator?

[Mark Huss]

Linear makes the LT3012, 3013, 3014 that provides up to 60 volts 
regulated at from 20 to 250 mA. I remember we used a linear high voltage 
regulator that could take up to 105 volts in, and provide up to 95 volts 
out. If memory serves, it was made by National Semi. Can't for the life 
of me remember the part number, and a look at the site does not reveal 
it. Could not provide much current. And it used a MOSFET pass 
transistor, so the voltage drop was humungous.

TubeCad Journal has a selection of high voltage power supplies (greater 
than 30 volts) using tubes, semiconductors, or a combination of both.

kenny wrote:
> Barry wrote:
>> I was thinking of a 24VAC xfmr with a full-wave bridge, a cap, and 
>> possibly a 3-terminal regulator but didn't know if a 30V 3-terminal 
>> regulator is available. Also, would like to make a 1.5V power supply 
>> for the D cell, but not sure if a 1 or 1.5 xfmr could be had as well 
>> as whether a 1.5V regulator is available.
>>
>> Any thoughts?
>>
> I have recently been searching for a Voltage Regulator for a 50-volt 
> supply that I want to build. So far I have had no luck at all and may 
> have to consider using transistors to help with regulation although on 
> the circuit that I found one of the author's first comments was "the 
> regulation is not as good as with a IC regulator" so I'm probably back 
> to the drawing board on that one.
>
> Someone suggested the LM317...Yes I would agree. They are cheap and 
> easy to obtain and you can adjust the voltage. Even though the 
> 30-volts is only used on the high-ohms range I would go ahead and 
> build it if I were you as it would bug me if I had a piece of 
> equipment that I couldn't get full use of (I expect many of us are 
> like that that's part of the reason we embark on restoring our BA's). 
> Regarding the 1.5-volt supply...I don't recall the type numbers 
> because during my search 1.5-volts did not interest me but I did 
> notice many regulators that can be adjusted down to this voltage.
>
> Regarding the supply that I want to build...My wishlist is for it to 
> be fully regulated and stable 50V and adjustable over a small range 
> 48-51V. I don't want to buy one, I want to build one but I just cannot 
> find a suitable regulator. Anyone have any ideas on where I can find a 
> regulator for this voltage OR a really good transistor (Bipolar or 
> FET) circuit?
>
> Regards,
>
> Ken
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