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by Guido Socher (homepage)
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ËùÐèÆ÷¼þ
Òª´î½¨Õâ¸öƵÂʼÆÄãÐèÒªÒÔÏÂÆ÷¼þ:
1 x Atmel At90S4433 Microcontroller
1 x 28pin 7,25 mm IC socket
2 x 16pin IC socket
1 x 1pin IC socket
1 x 14pin IC socket
No IC sockets for the MAX903 and the 74F74. Solder them directly to the
board!
1 x MAX232
1 x 4,194304MHz crystal
1 x LEDs (green)
1 x BC557 PNP transistor
4 x 1uF capacitor (biased)
2 x 27pF ceramic capacitor
4 x 10nF mini ceramic capacitor
3 x 100nF mini ceramic capacitor
1 x 200nF mini ceramic capacitor
1 x 0,47uF mini ceramic capacitor
2 x resistor 470 Ohm
1 x resistor 470K
2 x resistor 100 Ohm
3 x resistor 1k
5 x resistor 10k
3 x resistor 47K
1 x resistor 220 Ohm
3 x resistor 4K7
1 x resistor 3k3
1 x resistor 2k2
1 x resistor 47 Ohm
1 x 4K7 potentiometer (as small as possible), if you want you can
replace this potentiometer by a pair of resistors. This potentiometer is
used to set the
LCD contrast. For my LCD displays 100Ohm together with 1K gives a
good contrast.
1 x Z-diode 4.3V
2 x small touch buttons
1 x 470uF capacitor (biased)
1 x 4,7uF capacitor (biased)
1 x 1N4001 diode
1 x 74HC02 TTL IC
1 x 74F74 fast TTL IC
1 x 74HC390 TTL IC
1 x LM393 voltage comparator
1 x MAX903 high speed voltage comparator, 8 Pin plastic DIP package, you can
order it directly from www.maxim-ic.com in case your local dealer does not have
it in stock.
1 x 7805 5V regulator
1 x 2 line 20 character LCD display with HD44780 compatible
interface. With our without backlight (16 pin or 14 pin)
All LCD displays that I have ever seen with 14 or 16 pins on the
connector were HD44780 compatible. You can also use a 3 or 4
line display but then you will need to modify the software a
bit.
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