Re: generating 180VDC at 5mA or so, simply...
From: Jeff (levy_jeff_at_hotmail.com)
Date: 09/01/04
- Next message: Spork: "simple alarm system ideas?"
- Previous message: Gordon Youd: "Resin encapsulated modules"
- In reply to: Mike Deblis: "Re: generating 180VDC at 5mA or so, simply..."
- Next in thread: Genome: "Re: generating 180VDC at 5mA or so, simply..."
- Messages sorted by: [ date ] [ thread ]
Date: Wed, 01 Sep 2004 12:01:48 GMT
For driving a Neon tube, you don't need regulation that tight, or possibly
at all. Neon changes it's striking voltage with temp, and if it's iluminated
or not anyway. You also don't need DC.
As for a simple circuit, take one of those minature 8 ohm center tapped to
1000 ohm speaker transformers, connect the neon tube across the 1000 ohm
side, and connect power to the center tap on the 8 ohm side, drive the one
leg of the 8 ohm side with a transistor to the other power polarity
(dependant on transistor polarity), and use the other winding for feedback
to drive the base of the transistor through a cap and resistor.
"Mike Deblis" <mdeblis@hotmail.com> wrote in message
news:bc45f679.0409010100.6e9263c1@posting.google.com...
> "Mike Deblis" <mdeblis@hotmail.com> wrote in message
news:<ch2n7j$kvi$1@hercules.btinternet.com>...
> > Hi,
> >
> > I was wondering how to generate about 180VDC continuous at a few mA (at
> > least 5) from 9-12VDC in (no mains).
> ...
>
> I should qualify this - 2% or 3% regulation is probably fine, and this
> is an exercise (not a class - I'm far too old for that!) in NOT using
> a switcher chip - I'm well aware of their advantages in commercial
> products, but this is just a bit of fun to see how simple such a
> non-critical PSU can be made. I've use LT and MAX (771/1771) for
> exactly this sort of PSU, but I don't need their 80-90% efficiencies
> and 1% reg etc. Its more a question of "given a couple of discrete
> semiconductors and a few passives, plus a hand-wound small inductor,
> can something good enough be made"? i.e. "outside the box" thinking...
>
> The object is to drive some neon dischange tubes that strike at about
> 180VDC and which take about 2mA or so each.
>
> Mike
- Next message: Spork: "simple alarm system ideas?"
- Previous message: Gordon Youd: "Resin encapsulated modules"
- In reply to: Mike Deblis: "Re: generating 180VDC at 5mA or so, simply..."
- Next in thread: Genome: "Re: generating 180VDC at 5mA or so, simply..."
- Messages sorted by: [ date ] [ thread ]
Relevant Pages
|
