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Controller Shown below is the custom ATV receiver controller board.  Embedded Controller
Microchip PIC18F252 flash memory based processor running at 3.6864MHz.Control LCD
Brightness Conventional potentiometer used to set the 2 x 20
contrast ratio.RS-232
Driver TTL to RS-232 interface driver. Allows the embedded
controller to connect to external RS-232 devices.Reverse
Polarity Diode 3 amp Schottky rectifier diode. The Schottky
diode features low drop out voltage (around 0.3 volts) even at higher
current levels.4-Channel
DAC Used to set analog voltage for control of the video LCD
brightness, contrast, chroma level (color), and phase (tint).PIC I/O
Extender Microchip MCP23016 Provides an additional 16-bit of
discrete I/O used to control the LCD hardware and S-band receiver. The
PIC 18F252 didn't have enough I/O to drive the 2 x 20 LCD display as well as
the other on board devices. Receiver Controller Board. Schematic / PCB Layout For best quality, print the schematic on a single 8½ x 11" sheet of paper in landscape mode using your favorite graphics application.
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