RA-33 REV1 Parts List

All components are installed as close to the surface of the PC board as possible - including the LEDs.
Some component leads may need reshaped to fit into the holes of the PC board.
It's recommended to use 60/40 (or similar) rosin core tin / lead solder.
Kester 44 or better recommended.  Trim the leads close after soldering.

U1 - CM119A (presoldered)
U2 - NE555 Timer IC (8 Pin DIP)
U3 - Optional EEPROM (not included - not normally needed)

D1 - BAT43 Schottky diode (observe polarity!)
D2 - BAT43 Schottky diode (observe polarity!)
D3 - 1N4004  - 1N4007 Reverse polarity diode (observe polarity!)
D4 - 1N4148 small signal diode (observe polarity!)

J1 - DB9 Female Chassis Connector
J2 - USB-B Chassis Jack
JU1 - 3 pin header - green - with jumper (shorter part installed (soldered) into the board)
JU2 - 3 pin header - yellow - with jumper (shorter part installed (soldered) into the board)
JU3 - 3 pin header - blue - with jumper (shorter part installed (soldered) into the board)

H1 - 4 pin header - (white) - with jumper (shorter part installed (soldered) into the board)
H2 - 4 pin header - (white) - with jumper (shorter part installed (soldered) into the board)

LED1 - 3mm Red LED
LED2 - 3mm Green LED
LED3 - 3mm Blue LED
All LEDs orient with the long lead in the round hole.

(1) 8 Pin DIP IC Socket - in the U2 position.

Y1 - 12 MHz Crystal

Q1 - 2N2222 NPN Transistor
Q2 - 2N7000 FET
Q3 - 2N2222 NPN Transistor
Q4 - 2N2222 NPN Transistor

All fixed resistors are 1/8 Watt
R1  - 4.7k
R2  - 330 ohm
R3  - 1k
R4  - 10k
R5  - 10k
R6  - 10k
R7  - 1M 
R8  - 1.5k
R9  - 22 ohm
R10 - 22 ohm
R11 - 1M
R12 - 100k Pot (104)
R13 - 10k
R14 - 1k Pot (small 102)
R15 - 10k
R16 - 1k Pot (small 102)
R17 - 10k
R18 - 4.7k
R19 - 4.7k
R20 - 1k


NOTE:  Components that are supplied on a "carrier" paper should have their leads cut from the 
carrier near the edge of the paper.  Don't try to pull the component away from the carrier 
otherwise you could damage it.

NOTE: Some components have pre-bent leads and they'll need to be reformed to allow 
the part to fully seat on the surface of the circuit board. This is espacially true of C27 and C28.

NOTE:  Polarized capacitor locations include a "+" (plus sign) silkscreened where the positive 
lead orients.


C1  - 47pF small yellow MLCC (marked 47 or 470)
C2  - 20pF or 22pF yellow or blue MLCC (marked 20, 200 or 22, 220)
C3  - .47uF Tantalum (blue) (observe polarity!) (** faces opposite direction as 
      compared to C5)
C4  - 20pF or 22pF yellow or blue MLCC (marked 20, 200 or 22, 220)
C5  - .47uF Tantalum (blue) (observe polarity!) (** faces opposite direction as 
      compared  to C3)

C3 and C5 installation note:
The positive lead is on the right side when the printing is facing you.
C3 is installed so its printing faces C2.
C5 is installed so its printing faces away from C4.

C6  - 10uF electrolytic (observe polarity!)
C7  - 10uF electrolytic (observe polarity!)
C8  - 10uF electrolytic (observe polarity!)
C9  - 47pF small yellow MLCC (marked 47 or 470)
C10 - 4.7uF small (observe polarity!)
C11 - 100uF NON-POLAR (larger black)  (can be installed either way)
C12 - 100uF NON-POLAR (larger black)  (can be installed either way)
C13 - 4.7uF small (observe polarity!)
C14 - 4.7uF small (observe polarity!)
C15 - .1uF .1"LS (Marked "104") (smaller yellow)
C16 - 1uF Tantalum (green or yellow) (observe polarity - printing faces center of board)
C17 - 47pF small yellow MLCC (marked 47 or 470)
C18 - .01uF .1"LS  (marked "103") (yellow)
C19 - 47pF small yellow MLCC (marked 47 or 470)
C20 - 1uF Tantalum (green or yellow) (observe polarity - printing faces center of board)
C21 - 4.7uF small (observe polarity!)
C22 - 4.7uF small (observe polarity!)
C23 - 4.7uF small (observe polarity!)
C24 - 47pF small yellow MLCC (marked 47 or 470)
C25 - 47pF small yellow MLCC (marked 47 or 470)
C26 - 47pF small yellow MLCC (marked 47 or 470)
C27 - 100uF NON-POLAR (larger black)  (can be installed either way)
C28 - 100uF NON-POLAR (larger black)  (can be installed either way)

RA-33 REV1 printed circuit board.
LS = Component lead spacing - .1 inches = 2.54mm
MLCC = multi-layer ceramic capacitor.