I have an NE-51 neon indicator in parallel with a 115 VAC relay coil to indicate the state of the coil. Problem is it doesn't last long. Is it being blown by the kick back of the coil field collapsing when it is turned off. What should I do? bypass the lamp with a cap? How can I fix it?
Jeff
Is there a series resistor?
...Jim Thompson
-- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | |
-- No, you\'re wearing it out by putting too much current through it.
No and Thanks in that order! There is no resistor since I used a standard socket and not the one designed for neon bulbs so stupid me! I'll put the
220K in series..Great group! Jeff
being
off.
Yikes! I did that with an NE-2 about 50 years ago. Didn't last maybe 100 ms, then exploded. Was nice and bright while it worked, though..........................
Neon indicators need current limiting, and 115V (AC or DC) will destroy any neon indicator that does not have current limiting. Use a 100K resistor in series.
Hello Robert,
Depends which ones. I had a few that screwed into a regular small type lamp socket. Took one apart, couldn't find a resistor in there. This one was rated for EU voltages (230V).
But for the regular small pellet kinds you are right, they need a resistor.
Regards, Joerg
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