gordonl@microsoft.UUCP (Gordon Letwin) (11/08/88)
I have an LCD which is backlit by an electroluminescent panel. These things take a few milliamps of AC in the 60 to 80 V range, 60 hz to 400 hz, typically. This is part of a battery backed up system. I can brute force design a 12V DC to 70 VAC convertor, but it's crude and complex: an oscillator driving a voltage doubler chain followed by 2 complementary pairs to couple the panel's leads to the + and - DC, alternately, producing AC square wave. A small transformer would be better, and would guarantee true AC, but I'm having troubles locating an appropriate one. I've heard that there are small power supplies designed to drive these devices - DC to AC convertors of appropriate voltage and current. Does anyone have any pointers on these devices and where they might be obtained? thanks gordon letwin microsoft
magore@watdcsu.waterloo.edu (Mike Gore, Institute Computer Research - ICR) (11/09/88)
Hi, In article <1176@microsoft.UUCP> gordonl@microsoft.UUCP (Gordon Letwin) writes: >I have an LCD which is backlit by an electroluminescent panel. ... >I've heard that there are small power supplies designed to drive these >devices - DC to AC convertors of appropriate voltage and current. Does >anyone have any pointers on these devices and where they might be obtained? ... > gordon letwin Try Endicott Research Group. Inc 2601 Wayne STreet. P.O. Box 269, Endicott, NY 13760 607-754-9187 They have a series of electroluminescent drivers called "Smart Force" . I know *nothing* at all about the company but I did noticed the add in EMM ( Electronic Engineers Master Catolog) Volume D, 86-87, Page D-1730. EMM has many other sources listed as well - you might check them out. EMM is published by Hearst Business Communications, Inc . Try (516) 222-2500 in NY, (408) 249-6800 CA, etc ... Good luck, # Mike Gore # Institute for Computer Research. ( watmath!mgvax!root - at home ) # These ideas/concepts do not imply views held by the University of Waterloo.
gmg@hcx.uucp (Greg M. Garner) (11/09/88)
In article <1176@microsoft.UUCP>, gordonl@microsoft.UUCP (Gordon Letwin) writes: > I have an LCD which is backlit by an electroluminescent panel. These > things take a few milliamps of AC in the 60 to 80 V range, 60 hz to > 400 hz, typically. > [stuff deleted here] > A small transformer would be better, and would guarantee true AC, but > I'm having troubles locating an appropriate one. > > I've heard that there are small power supplies designed to drive these > devices - DC to AC convertors of appropriate voltage and current. Does > anyone have any pointers on these devices and where they might be obtained? > > thanks > > gordon letwin > microsoft Gordon, I have used one of these beasties. It came from Densitron Corporation. They sell 6 different types, which put out a range of 34-110 MA and 67-86 volts, some running at 410 HZ up to 750 HZ. I paid about 10.00 dollars for mine, and it runs a backlight on a 2X40 character display. They also sell displays. Anyway, to get more info on these, call Densitron. By the way, they sent me a complete little folder showing all there small lcd products, and application notes. I really liked the way all there stuff works. Good luck! Densitron Corporation 2540 West 237th ST. Torrence, CA. 90505 USA 213-530-3530 Part number that I am using is: das5v7 (5 volt input) /* I am not associated in any way with densitron other than being a satisfied customer. */ Greg Garner gmg@hcx.uucp path: ...!uunet!harris.cis.ksu.edu!hcx!gmg 501-442-4847
phillip@bartal.CRLABS.COM (Phillip Vogel) (11/09/88)
> From: gordonl@microsoft.UUCP (Gordon Letwin) > Date: 7 Nov 88 18:36:37 GMT > I have an LCD which is backlit by an electroluminescent panel. These > things take a few milliamps of AC in the 60 to 80 V range, 60 hz to > 400 hz, typically. > > I've heard that there are small power supplies designed to drive these > devices - DC to AC convertors of appropriate voltage and current. Does > anyone have any pointers on these devices and where they might be obtained? I have a sample from: Hantronix, Inc. 250 Santa Ana Court Sunnyvale, Ca 94086 (408) 736-3191 FAX: (408)749-0477 It's about 1 inch square, and costs about 3 - 5 dollars. I'm sure you could get your local sales rep to get you a couple of samples. These things are also available from Sanyo, among others. -- Phillip M. Vogel - Bartal Design Group, Inc. - Englewood, NJ DOMAIN: phillip@bartal.CRLABS.COM UUCP: killer!crlabs!bartal!phillip DISCLAIMER: Hell, I OWN the company !