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Subject: Re: PIC Digital Volume Controller
Date: Sat, 02 Nov 2002 09:50:29 GMT
NNTP-Posting-Date: Sat, 02 Nov 2002 10:50:29 CET
Organization: Telia Internet
I have solved it once like this. the display need -10V, so i borrowed
it from the MAX232 chip used to communicate with PC. and like another
thread in this discussion i used a PWM to swich a mosfet like bss123 or
others from philips.
it was connected from gnd to a resistor to -10Volt. the resistor has a
another RC net to filter the voltage and that voltage can now be varied
from -10 up to 0 with correct values. That was the contrast voltage....i
Ian Sheevan wrote:
> I am currently working on the project
> "PIC Graphics LCD Scope"
> available here:
> I plan to control the LCD contrast
> using a digital pot [Similar to digital
> volume push-button] rather than the
> Is it possible to control the LCD contrast
> using the PIC16f877 rather than using ready
> made IC's from MAXIM [Dallas Semiconductor]?
> If not possible, Is there a circuit that
> functions like a potentiometer without
> using Maxim IC's?
> All suggestions appreciated.
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