Re: Linear regulated 150V supply

From: Spehro Pefhany (speffSNIP_at_interlogDOTyou.knowwhat)
Date: 11/22/04 

Date: Sun, 21 Nov 2004 21:01:58 -0500

On Mon, 22 Nov 2004 01:40:45 GMT, the renowned Robert Baer
<robertbaer@earthlink.net> wrote:

>John Fields wrote:
>>
>> On Sun, 21 Nov 2004 22:31:49 +0100, Rene Tschaggelar <none@none.net>
>> wrote:
>>
>> >Is the LM723 still the regulator of choice for a
>> >regulated 150V supply driven by a line transformer ?
>> >The current to be supplied is moderate, say up too
>> >200mA.
>> >Or are there any alternatives with an external pass
>> >transistor / FET ?
>>
>> ---
>> How about something like this?
>>
>>
>> 4W
>> ////////
>> +170>--+------+------D S--------+----------+---->+150
>> | | G | |
>> | [R] | [R] [R]
>> | | | | |
>> | +--------+ +---+-----+ |
>> | | | | | |
>> |+ | | [R] | |
>> [BFC] | | | +| |
>> | D /-|--+ [C] |
>> | G--+--[R]---< | | | |
>> | S | \+|--|-----|----+
>> | | | | |+ | |
>> | | [C] | [REF] | [R]
>> | | | | | | |
>> GND>---+------+----+----------+---+-----+----+---->GND
>>
>> --
>> John Fields
>
> Oh, my! No consideration for all that extra gain (and likely
>oscillation)!

It'll stop when the gate punctures on the pass transistor.

He did say "something like this".

Best regards,
Spehro Pefhany 

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