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Simple Negative Voltage Solution for the common man, easy!!!
http://forum.lcdinfo.com/viewtopic.php?f=6&t=1206		 Page 1 of 1
Author:  lodrazor [ Wed May 18, 2005 19:59 ]
Post subject:  Simple Negative Voltage Solution for the common man, easy!!!
Go to: http://www.allelectronics.com/cgi-bin/category.cgi?item=DC-32&type=store&review=all and buy this part, it's only $.99 Now, there has been a lot of confusion and problems getting this part to work. I have made 10 of these so far, and it takes about 30 mins tops to make a solution. It is a stable, cool running, and solid solution to getting negative voltage for contrast. Follow this diagram I made, it is simpler to follow than the supplied schematic with the part:

Image

I hope this helps. It is very easy to make, even if you dont have much soldering/wiring ability. Any quesitons, please feel free to ask.
Author:  coorz [ Wed May 18, 2005 20:06 ]
Post subject: 
Great guide, easiest DC-DC i've seen, even i might be able to pull that off 8)
Author:  lodrazor [ Wed May 18, 2005 23:37 ]
Post subject: 
HAHAHAHHA, seriously man, being a wiring dude, is this scheme simple enough?? Did I explain everything right?? Would a regular Joe like me be able to wire it up?
Author:  Chancy99 [ Thu Jun 16, 2005 23:51 ]
Post subject: 
lodrazor -

Your diagram is missing from the original post. Can you repost it ?

Thanks -

D.

[edit] Son of a b*tch. Now it's there. Blasted internet thing ...
Author:  CFE [ Tue Jun 21, 2005 13:26 ]
Post subject: 
Could you post a picture of your final DC-DC converter here?
Author:  Guest [ Sun Feb 05, 2006 1:38 ]
Post subject: 
I don't know if this works with LCDs, but I've done it before with other hardware...
Voltage is relative, i.e. if you connect the + of a LED to 50V DC and the - to a +47V, the LED will only have 3V across it. This is the theory.
The only difference in positive and negative voltage is the direction the electrons are flowing through the component.
Say you need -5V and you only have +5V and GND.
Since ground = 0 Volts, just reverse the connections to the LCD, so ground is connected to the -5V line, and +5V is considered ground.
Once again, I'll warn you, I DON'T KNOW 100% for sure IF THIS WILL WORK WITH SOME LCDS... YOU MAY END UP TOASTING YOURS. Consider yourself warned. Try this at your own risk.
Author:  hooilin [ Mon Mar 06, 2006 16:07 ]
Post subject: 
is the IC a 555 timer IC ?
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