From: Lizard Blizzard
Subject: Re: neon lamp query
Date: Wed, 18 Sep 2002 16:37:37 -0700
X-Mailer: Mozilla 4.79 [en] (Windows NT 5.0; U)
petrus bitbyter wrote:
> Most of that type of neon bulbs strikes at 90VDC/65VAC. Continuous current
> is 0.5 to 1mA at a lower then the strike voltage p.e. 70VDC at 1mA. So for a
> 220V mains, start with a 330kOhm, 0.25W seriesresistor. If you have light
> enough, keep it this way. Otherwise you can lower the resistor keeping an
> eye on the current by measuring the voltage of the resistor.
The waveform across the resistor isn't a sinewave, so it's doubtful that
the meter will measure it accurately. BTW, I said use a 47k, but that
's for 120VAC.
> "bc" schreef in bericht news:email@example.com...
> > Hi,
> > I have a query about neon lamps; in particular, those little bulb neons we
> > use as indicators that the mains electricity supply is on.
> > I have a collection of these things and I want to use one as a mains
> > indicator on a prototype project. I need to use a dropper resistor, but
> > size? This is a heterogeneous collection of neons and they may well have
> > quite different striking voltages. I can pick one and find its approximate
> > strike voltage using a charged-up 400V capacitor and a very large dropping
> > resistor. But to calculate the final dropping-resistor size, I need to
> > the size of the continuous current that these things are expected to
> > on; is it about 1mA or nearer 50?
> > How much is too much?
> > Please email any answers
> > Regards Bruce
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