I think he was talking about a -5supply that you make from a low voltage AND
that both rails of teh 5V supply are insulated very well from earth/ground.
ie Floating.
Then you can wire each of its leads to a place that could be a voltage well
above [or below] earth/gnd. Let's wait for him to pipe up. I was only
replying early in case it put you on the right track.
Look into supplies that have "floating" outputs. Get that concept figured
out firmly. [I noticed that you said you are willing to learn.]
jk
----- Original Message -----
From: "Paul Andrews" <judge2...@gmail.com>
To: <neonixie-l@googlegroups.com>
Sent: Sunday, April 02, 2017 12:36 AM
Subject: Re: [neonixie-l] Re: Constant current source design
As I see it, the base voltage needs to be -5V wrt to the emitter, so if the
emitter voltage is 200, then the base voltage needs to be 195. Am I missing
something?
On Apr 1, 2017, at 9:42 AM, JohnK <yend...@internode.on.net> wrote:
I suspect that he meant if you wanted the 1ve supply, then the devices he
mentioned give it easily directly from your low voltage supply - I don't
think he meant you to use up your precious High Voltage. Presumably you
are running the high voltage generator DCDC conv off a low voltage? You
aren't getting High Volts dangerously from the mains?
John K
----- Original Message ----- From: "Paul Andrews" <p...@nixies.us>
To: "neonixie-l" <neonixie-l@googlegroups.com>
Sent: Saturday, April 01, 2017 11:51 PM
Subject: [neonixie-l] Re: Constant current source design
If I just look at all of the circuit diagrams for various current
limiters, it begins to seem like any combination of a couple of
transistors and a bunch of resistors works! Hence my need to do some
'practicals', it makes me go in to it all in enough depth to actually
begin to understand.
BTW, how exactly would I drop 5V from 200V using a DCDC converter? I.e.
which converter (part number?) and how would it be wired up (diagrams
help, I'm a visual type of person).
Thanks in advance.
Maybe I should just do a masters in electronics.
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