My apologies. In my original post I miss-spelled my own e-mail
address, resulting in all inquiries being bounced. The correct
e-mail address is tom_mcgahee@sigmais.com  note the underscore
in tom_mcgahee.

Someone asked about what voltage/frequency these things output,
and whether or not you need different types of inverters for
different sized panels. My understanding is that the larger
panels require more total current than smaller panels. I have
about ten different types of EL backlight panels here, ranging
from the usual Optrex 2x16 parts up to the 4x40 parts. The
EL inverter described below seems to drive them all quite well,
and the current *drawn* by the module is a function of the panel
area as far as I can see. I have no spec sheets for this device,
unfortunately, but my testing seems to indicate that this
particular inverter is capable of driving all the standard
EL backlights found in the usual LCD modules.

A quick test with an EL backlight .8"x4" (3.2 square inches
of area) resulted in a bright blue light, with the inverter
consuming 40 ma at 5V. The output of the inverter was observed
on an oscilloscope under these load conditions, and the waveform
was a slightly distorted sine wave in shape, with a peak voltage
of 135 volts and a frequency of 1.4Khz

No-load input current was 24 ma at 5V. I successfully drove
three of the above EL backlights in parallel from the inverter,
and input current increased to 85 ma at 5 v. Display was still
a bright blue, but slightly diminished in brightness. So the
module appears capable of driving about 10 square inches of EL
backlighting at full brightness. I think it is safe to say that
this inverter module will adequately drive the backlight panel
of any reasonably sized LCD display.

Hope this helps.
Fr. Tom McGahee

----------
> From: Thomas McGahee <tom_mcgahee@sigmais.com>
> To: pic microcontroller discussion list <PICLIST@MITVMA.MIT.EDU>
> Subject: LCD Backlight EL Inverters For Sale
> Date: Monday, July 20, 1998 5:33 PM
>
> PICsters,
>
> I don't have a schematic, but I have qty=210 excellent inverter
> modules that take +5 v and convert it to the required AC voltage.
> Three pin device: +5/Gnd/Inverter out. I have used these myself,
> and they work great.
>
> Label on each unit (all are brand new) is NEL-D32-50 8L07
>
> Dimensions are:   w=.825"  l=1.65"  h=1"  black plastic case.
> Lead spacing is .5" and 1.4"
>
> Bottom view:
>
> ------------------------
> |                  HV  |
> |                  *   |
> |   +5                 |
> |   *              *   |
> |                  Gnd |
> ------------------------
>
> Easily disassembles. Can be reverse engineered with ease, as
> it is not potted.
>
> Always use a decent bypass cap between +5 and Gnd connection!
>
> I am willing to sell any quantity (up to what I got) at $6 each
> plus total shipping.  Usual prices for such inverters are from
> $12 and up at places like Digi-Key.
>
> If anyone is interested, contact me off-list tom_mcgahee@sigmais.com
*** This is the corrected address ***
>
> Hope this helps.
> Fr. Tom McGahee
>
> ******** in answer to post below *******
> ----------
> From: Claudio Rachiele IW0DZG <75805312@IT.IBM.COM>
> To: PICLIST@MITVMA.MIT.EDU
> Subject: looking for LCD backlight EL inverter schematic
> Date: Sunday, July 19, 1998 3:25 PM
>
>
> I have two alphanumeric dot matrix LCD with EL backlighting.
> I need the schematic of an inverter to drive the EL backlit hi voltage.
> PLS address me to an URL or send me any info where to found it.
> TIA
>
>                        Claudio Rachiele IW0DZG
> ----------
>