DRA-50M REV1 & REV2 Parts List - 
NOTE - REV2 comments in brackets [ ]

U1 - CM119A (presoldered)
U2 - LM386 JRC386
U3 - LM386 JRC386
U4 - NE555
U5 - EEPROM (optional - not normally supplied or installed)

D1 - BAT43 (blue - observe polarity!)
D2 - Not installed on the DRA-50M
D3 - Not installed on the DRA-50M
D4 - 1N4148 (dark orange - observe polarity!)
D5 - BAT43 (blue - observe polarity!)
[D6] - 1N4148 (dark orange - observe polarity!) [REV2 only]

J1 - Mini-DIN-6 Female Chassis Connector
J2 - USB-B Chassis Jack

These headers are installed so the shorter section is inserted (soldered) into the board
JU1 - Not installed on the DRA-50M
JU2 - Not installed on the DRA-50M
JU3 - 2 pin header - blue - with shorting bar or "shunt"
JU4 - Not installed on the DRA-50M
JU5 - 3 pin header - blue - with shorting bar or "shunt"
JU6 - 2 pin header - blue - with shorting bar or "shunt"
JU7 - 3 pin header - blue - with shorting bar or "shunt"
[PTT] - 2 pin header - red - with shorting bar or "shunt" [REV2 only]
[PTT] - 2 pin header - red - with shorting bar or "shunt" [REV2 only]

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

(3) 8 Pin DIP IC Sockets

Y1 - 12 MHz Crystal

Q1 - 2N2222
Q2 - 2N7000
Q3 - 2N2222
Q4 - Not installed on the DRA-50M

All Resistors are 1/8 Watt
R1  - 4.7k
R2  - 330 ohm
R3  - 1k
R4  - 10k
R5  - 1 Meg ohm
R6  - 22 ohm
R7  - 22 ohm
R8  - 1.5k
R9  - Not present
R10 - 1 Meg ohm
R11 - Not present
R12 - 100k Pot (104)
R13 - 4.7k
R14 - 10k Pot (103)
R15 - 10k
R16 - 10k Pot (103)
R17 - 10k
R18 - 4.7k
R19 - 10 ohm
R20 - 10 ohm
R21 - Not present
R22 - 10k
R23 - 10k

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 on the board 
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 (yellow - preinstalled)
C4  - 20pF or 22pF yellow or blue MLCC (marked 20, 200 or 22, 220)
C5  - .47uF Tantalum (yellow - pre-instaled)
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 electrolytic (observe polarity!)
C11 - 4.7uF small electrolytic (observe polarity!)
C12 - 4.7uF small electrolytic (observe polarity!)
C13 - 4.7uF small electrolytic (observe polarity!)
C14 - 4.7uF small electrolytic (observe polarity!)
C15 - .1uF .1"LS (Marked "104")(small yellow)
C16 - 47pF small yellow MLCC (marked 47 or 470)
C17 - 47pF small yellow MLCC (marked 47 or 470)
C18 - Not present
C19 - 4.7uF small electrolytic (observe polarity!)
C20 - 47pF small yellow MLCC (marked 47 or 470)
C21 - 4.7uF small electrolytic (observe polarity!)
C22 - 4.7uF small electrolytic (observe polarity!)
C23 - .047uF .1"LS (small yellow - marked 473)
C24 - .047uF .1"LS (small yellow - marked 473)
C25 - 100uF  (polarized electrolytic) (observe polarity!)
C26 - 100uF  NON-POLAR (larger black electrolytic) (can be installed either way)
C27 - 100uF  (polarized electrolytic) (observe polarity!)
C28 - 100uF  NON-POLAR (larger black electrolytic) (can be installed either way)
C29 - Not present
C30 - .01uF .1"LS  (Marked "103")(small yellow)
C31 - 1uF Tantalum (green or yellow) (observe polarity - printing faces R12)
C32 - 1uF Tantalum (green or yellow) (observe polarity - printing faces C22)

[RY1] - 5V Reed Relay [REV2 only]


DRA-50M REV1 or REV2 printed circuit board - Blue color.
LS = Component lead spacing - .1 inches = 2.54mm