RA-25 Parts List

U1 - CM119A (presoldered)
U2 - NE555

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

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

LED1 - 3mm Red LED
LED2 - 3mm Green LED
LED3 - 3mm Blue LED
All LEDs orient with long lead in the round 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 small yellow MLCC (marked 47 or 470)
C2  - 20 or 22pF small yellow or blue MLCC (marked 20 - 200, 22 - 220)
C3  - .47uF Tantalum (blue) (observe polarity!) (** faces opposite direction as 
      compared to C5)
C4  - 20 or 22pF small yellow or blue MLCC (marked 20, 200, 22 - 220)
C5  - .47uF Tantalum (blue) (observe polarity!) (** faces opposite direction as 
      compared  to C3)

The positive lead on the right side when the printing is facing you.
C3 is installed so the printing faces C2.
C5 is installed so the 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 - 4.7uF small (observe polarity!)
C12 - 4.7uF small (observe polarity!)
C13 - 47pF small yellow MLCC (marked 47 or 470)
C14 - 47pF small yellow MLCC (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 small (observe polarity!)
C22 - 47pF small yellow MLCC (marked 47 or 470)
C23 - 47pF small yellow MLCC (marked 47 or 470)


RA-25 REV1 (or later) printed circuit board.
LS = Component lead spacing - .1 inches = 2.54mm
MLCC = multi-layer ceramic capacitor.