Parts List – microR2 Receiver

The part designators and values are the ones supplied with the kit. They may not correspond exactly with the designators and values in the QST article.

Qty Designator Value
1 C36 2.2p
1 C34 20p trimmer
1 C29 39p chip
1 C25 39p
1 C24 65p trimmer
1 C35 68p
1 C40 100pf variable
2 C13, C14 220p
1 C28 390p
3 C20, C22, C26 470p
4 C8, C9, C10, C11 matched to 1% 10.0nf
6 C19, C21, C23, C27, C37, C38 100nf
2 C5, C6 150nf
4 C30, C31, C32, C33 .82uf
7 C1, C2, C3, C4, C7, C18, C39 33uf
1 C12 100uf
     
4 R46, R48, R49, R53 51 ohm
3 R8, R47, R52 100 ohm
2 R44, R50 150 ohm
3 R39, R40, R42 470 ohm
1 R4 2.2k
2 R1, R2 2.4k
2 R19, R23 5k trimmer
1 R20 7.5k
2 R6, R7 9.1k
10 R3, R15, R16, R17, R18, R21, R22, R38, R41, R43 10k
10 R28, R28, R30, R31, R32, R33, R34, R35, R36, R37 10.0k 1%
2 R9, R10 27k
6 R5, R11, R12, R13, R14, R45 100k
1 R51 1M
     
3 Q1, Q2, Q3 2N3904
2 Q4, Q5 J310
5 U1, U2, U3, U4, U5 NE5532
1 U6 LM78L06
2 MX1, MX2 TUF-3
     
2 RFC1, RFC2 15uh
     
1 T1 - T37-2 core (red) 17 turns bifilar  
1 L3 - T37-2 (red) 18 turns  
1 L4 - T37-2 (red) 40 turns  
2 L5, L6 3.9mh
1 L7 - T50-6 (yellow) 36 turn primary, tapped at 8 turns from ground end. 2 turn link  
10 W1, W4, W6, W7, W8, W9, W10, J1, JP1, JP2 2 pin header
1 W2, W3 together 4 pin header
1 10k volume control  -  see notes 10k
1 Printed Circuit Board  

 
  SSB Specific Parts  
1 R24 2.32k 1%
1 R25 28.0k 1%
1 R26 9.53k 1%
1 R27 115k 1%
1 L1, L2 33mh
1 C15 150nf
1 C17 180nf
1 C16 220nf

 
  CW Specific Parts  
1 R24 4.75k 1%
1 R25 41.2k 1%
1 R26 16.9k 1%
1 R27 147k 1%
2 L1, L2 100mh
2 C15, C17 390nf
1 C16 560nf

 

Additional construction notes are here.

Variable cap size is 1 3/8" w  x  1 3/8" h  x  1 1/4" d  .The 1/4" diameter shaft extends 11/16" from the front of the cap. There are several tapped holes on the capacitor frame that can be used for mounting (6-32 on front and rear, 4-40 on bottom).  See the QST article for information on variable capacitor requirements if you are building your own version of the microR2. The capacitor I supply is manufactured by Oren Elliott Products here in Ohio.  I don't believe they are set up to do small quantity orders

Parts you will need to supply include but are not limited to:
Antenna connector (SO-239, BNC RCA, etc)
Power connector
Headphone jack
Main tuning and volume control knobs
4 standoffs with screws to use for mounting the PC board
Insulated hookup wire.  Stranded #22 is a good size to use, but other sizes are ok!
Misc hardware to mount variable capacitor, solder lugs for ground connections, etc.
Enclosure.  I used a TenTec Aluminum cabinet  about 7" w x 6" d x 3" h.  That is bigger than necessary.
12 volt power supply.  This can be a battery or power supply that can supply a current of at least 100 ma.  A battery is recommended for best performance.