RA-25K REV1 Prototype Parts List

U1 - CM119A (presoldered)
U2 - NE555

D1 - BAT43 (observe polarity!)
D2 - BAT43 (observe polarity!)
D3 - 1N4148 (observe polarity!)
D4 - BAT43 (observe polarity!)

J1 - DB9 Female Chassis Connector
J2 - USB-B Chassis Jack

JU1 - 2 pin header - white - with jumper (shorter part installed (soldered) into the board)
JU2 - 2 pin header - white - with jumper (shorter part installed (soldered) into the board)
JU3 - 2 pin header - white - with jumper (shorter part installed (soldered) into the board)
JU4 - 2 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 short lead in the square hole.

(1) 8 Pin IC Socket

Y1 - 12 MHz Crystal

Q1 - 2N2222
Q2 - 2N7000
Q3 - 2N2222

All Resistors are 1/8 Watt
R1  - 4.7k
R2  - 330 ohm
R3  - 1k
R4  - 10k
R5  - 10k
R6  - 10k
R7  - 1M
R8  - 22 ohm
R9  - 22 ohm
R10 - 1.5k
R11 - 1M 
R12 - 100k Pot (104)
R13 - 4.7k
R14 - 4.7k

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.

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


C1  - 47pF ceramic (marked 47or 470)
C2  - 20pF ceramic disc or small yellow MLCC (marked 20 or 200)

C3  - .47uF Tantalum 35V (yellow or blue) (see note below - observe polarity!) 
       (** faces opposite direction as compared to C5)

C4  - 20pF ceramic disc or small yellow MLCC (marked 20 or 200)

C5  - .47uF Tantalum 35V (yellow or blue) (see note below - observe polarity!)
       (** faces opposite direction as compared  to C3)

NOTE: C3 and C5 can be supplied as a blue or yellow part.
Yellow ones have a longer lead that is positive. Blue ones do too, but after you cut the part 
away from the paper, you lose that reference.
The positive lead is on the right side when the printing is facing you (either color).
C3 is installed so the printing faces C2 (either color).
C5 is installed so the printing faces the center of the board (either color).

C6  - 10uF 16 or 25V (observe polarity!)
C7  - 10uF 16 or 25V (observe polarity!)
C8  - 10uF 16 or 25V (observe polarity!)
C9  - 47pF ceramic (marked 47 or 470)
C10 - 4.7uF 35V small (observe polarity!)
C11 - 4.7uF 35V small (observe polarity!)
C12 - 4.7uF 35V small (observe polarity!)
C13 - 47pF ceramic (marked 47 or 470)
C14 - 47pF ceramic (marked 47 or 470)
C15 - .1uF .1"LS (Marked "104") (smaller yellow)
C16 - 1uF Tantalum (green or yellow) (observe polarity - printing faces center of board)
C17 - .01uF .1"LS  (Marked "103") (yellow)
C18 - 1uF Tantalum (green or yellow) (observe polarity - printing faces center of board)
C19 - 100uF NON-POLAR (black)  (can be installed either way)
C20 - 100uF NON-POLAR (black)  (can be installed either way)
C21 - 4.7uF 35V small (observe polarity!)
C22 - 47pF ceramic (marked 47 or 470)
C23 - 47pF ceramic (marked 47 or 470)


RA-25K REV1 (Prototype) printed circuit board.
LS = Component lead spacing - .1 inches = 2.54mm