Available Now
Functions & Specs:
50Ω Input & 50Ω Output
~80 dB gain
AGC On/Off
AGC Out (useful for S-Meter)
Both MUTE(+) & MUTE(-)
PCB size is 2.0 x 2.5 inches - 50.8 mm x 63.5 mm
This kit does NOT include:
_____ Power Connector and Power Switch
_____ PCB Enclosure
_____ Hookup Wire
For Solder Pencil Soldering, this kit recommends:
_____ Good Quality 45 Degree Diagonal Tweezers.
_____ HAKKO FX-888D Temperature Controlled Solder Pencil.
_____ CircuitWorks CW 3220 Liquid Flux.
_____ Kester Solder 63/37 .028 - use for other parts.
For Hot Air Soldering, this kit recommends:
_____ Hot Air Gun Model 858D (or better).
Search http://ebay.com for item # 274463047101
_____ CircuitWorks CW 3220 Liquid Flux.
Search http://ebay.com for item # 202373307435
_____ Kester Solder 63/37 .020 (0,5 mm) - use for SMDs.
_____ Mechanic Solder Paste XGZ40 63/37 Paste/Flux 183 Deg C, IPX3, 35g
Search http://ebay.com for item # 223803694552
Production Schematic: ExpressPCB Schematic Source File
Production PCB: ExpressPCB Board Layout Source File
Building Instructions:
1. DO NOT remove any parts from the kit until instructed to do so.
Keep the lone single black toroid in the SMD bag segregated from the other black toroids.
2. Some helpful SMT Info / Links
Surface-Mount Soldering Notes by W8BH, Bruce Hall Youtube Link About Desoldering And Flux Youtube Link About Capacitors Youtube Link General SMT Tutorial Youtube Link Hot Air SMT
3. Try to limit the handling of the SMT parts; they have a tendancy to disappear.
If using a hot air gun, you may wish to organize the parts installation into sections.
4. Install the unmarked SMD capacitors next.
_____ C1,3,4,5,6,7,8,9,10,11,14 - 100n 20% (FLAT Body) - qty 11 - install and solder.
_____ C12,13 - 2u2 10% (SQUARE Body) - qty 2 - install and solder.
C2A is not needed for 9 MHz and is not included.
5. Install all SMD 1206 resistors.
_____ R1,5 - 220Ω - labeled as 221
_____ R2,6 - 100KΩ - labeled as 104
_____ R3,7,12,13 - 100Ω - labeled as 101
_____ R4 - 22Ω - labeled as 220
_____ R8 - 51Ω - labeled as 510
_____ R9 - 10KΩ - labeled as 103
_____ R10,17 - 21KΩ - labeled as 2102
_____ R11,15 - 2KΩ - labeled as 202
_____ R14 - 499Ω - labeled as 4990
_____ R16,22,23,R24 - 1KΩ - labeled as 102
_____ R18,21 - 35K7Ω - labeled as 3572
_____ R19,20 - 4K7Ω - labeled as 472
6. Install all SMD diodes.
_____ D1 - BAV99 (SOT-23) Dual Signal Diode - labeled as KJE-50
_____ D2 - 5V6 Zener (SOT-23) - labeled as 8GM
7. Install all SMD transistors.
_____ Q1,3,5,6,7,9 - 2N3904 (SOT-23) - labeled as 1AM
_____ Q8 - 2N3906 (SOT-23) - labeled as 3N
_____ Q2,4 - J310 (SOT-23) - labeled as 6T
8. Install Trimmer Cap.
_____ C2 - 50pF brown trimmer cap
9. Install Suppressor Beads.
Insert 1 inch resistor leads through the FB-43-101 ferrite beads
Bend the resistor leads as shown...
_____ Z1,2 - Install beads at Z1 & Z2
10. (optional user supplied) Install any or all six, 3-Pin headers on top of the PCB
_____ J1,2,3,4,5,6 - 3-Pin Headers
How to wind toroids without pain
11. Install L1 and possibly C2A (Input Matching Network - transforms 50Ω to 2700Ω)
These instructions are for a 9 MHz IF
Other IFs require different L/C values for L1 & C2A
To calculate the network values for other frequencies
go to http://toroids.info/FT37-67.php
_____ Cut 12 inches of the red #27 magnets wire
_____ Retrieve the FT37-67 ferrite toroid from the SMD parts bag
_____ Wind 18 turns evenly spaced on the toroid
_____ Cut the wire ends to a length of 1/2 inch; Strip the insulation and Tin with Solder
_____ Install at L1 location on the PCB
_____ C2A is not required for an IF of 9 MHz
12. Install Toroid Inductors L2 & L3
_____ Cut two pieces of #27 red magnet wire to 9 inches each
_____ Wind 12 turns on both FT37-43 black toroids
_____ Cut the wire ends to a length of 1/2 inch; Strip the insulation and Tin with Solder
_____ Install L2 & L3 onto the PCB
13. Install Toroid Transformer T1
_____ Cut one piece of #27 red magnet wire to 9 inches each
_____ Wind 12 turns on an FT37-43 black toroid CLOCKWISE
_____ Wind 5 turns of green magnet wire on the toroid COUNTERCLOCKWISE
_____ Cut the wire ends to a length of 1/2 inch; Strip the insulation and Tin with Solder
_____ Install T1 onto the PCB with the green wires in the middle-center of T1
Parts List:
Part-ID Value Quantity C1,3,4,5,6,7,8,9,10,11,14 unmarked 100n 11+1 not labeled - FLAT Body C12,13 unmarked 2u2 not labeled - SQUARE Body C2 50 pF brown trimmer (observe polarity marking on PCB) C2A not included D1 BAV99 Dual Signal Diode labeled KJE-50 D2 5V6 Zener labeled as 8GM J1,2,3,4,5,6 Optional user supplied 3-Pin Headers L1 FT37-67 18 turns (12 inches red #27 magnet wire)red (9 MHz IF) - located in SMD bag L2,3 FT37-43 12 turns (9 inches red #27 magnet wire) T1 FT37-43 12 turns (9 inches red #27 magnet wire) & 5 turns green - see text above Q1,3,5,6,7,9 2N3904 labeled as 1AM Q8 2N3906 labeled 3N Q2,4 J310 labeled 6T R1,5 220 labeled 221 R2,6 100K labeled as 104 R3,7,12,13 100 labeled 101 R4 22 labeled 220 R8 51 labeled 510 R9 10K labeled 103 R10,17 21K labeled as 2102 R11,15 2K labeled as 202 R14 499 labeled as 4990 R16,22,23,24 1K labeled as 102 R18,21 35K7 labeled as 3572 R19,20 4K7 labeled as 472 Z1,2 BN-43-101 ferrite bead