DrBunsen Posted July 31, 2003 Report Share Posted July 31, 2003 I've put down a bid on the following LCD - a low enough bid to take the chance on it working - but I thought I'd better ask around and see if anyone can advise me before I bid any higher. http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&item=254826362720 x 2 Alphanumeric LCD displayOPTREX DMC2059This display has an Orange backlight (approx 14V)Extended temperature operation.Requires -7v bias for contrast control.Large Character format.I can't find a spec sheet matching that model number on the OPtrex website, or via Google. It's for the MIDIbox SID and the 16E or 64.Any advice would be appreciated. Quote Link to comment Share on other sites More sharing options...
TK. Posted August 1, 2003 Report Share Posted August 1, 2003 I guess that this display is HD44780 compatible, but I wouldn't buy it - the high backlight voltage requires a second power supply unit, and for the -7V bias voltage you've to use a DC/DC voltage converter like shown here: http://www.ucapps.de/mbhp/mbhp_glcd0.pdfIn fact it will cost you more (trouble) than a common LCD.Best Regards, Thorsten. Quote Link to comment Share on other sites More sharing options...
Steven_C Posted August 1, 2003 Report Share Posted August 1, 2003 Hey Dr B,if you can use 16x2, Dick Smith carry an LED backlit (green) device that worked fine for me, but for AUS$38 it is very expensive!!! Quote Link to comment Share on other sites More sharing options...
DrBunsen Posted August 1, 2003 Author Report Share Posted August 1, 2003 I received the following reply from the seller:I have an equivilent datasheet for these displays on my computer at home.They are standard HD44780 compatible LCD, they are large font extendend temperature.This particular display was a custom manufacture from Optrex, they work well, and are standard except for the backlight which has the current limiting resistors designed for an input voltage of 13-14v.The extended temp operation is similar for all optrex LCD's, theyrequire -7V bias for contrast.I usually steal -10V through a 10k pot from a max232 or similar, it only requires 1mA or so....I will email you a copy of the datasheet I have when I get home later today.Thanks for your reply TK. He also has two 20x4 displays for sale; could I use them in the MIDIBoxen? Quote Link to comment Share on other sites More sharing options...
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