Kits and Parts dot Com
Supplying Toroids, Electronic Parts and Kits to Engineers, Schools and Hobbyists

Home
Create Quote
Place Order
Customer Portal
Trimmer Capacitors
NPO Disc Capacitors
Polystyrene Capacitors
Silvered Mica Capacitors
Crystals - Matched
W3NQN Filters
WA2EBY Toroid Kit
Variable Inductors
Magnet Wire
Diodes
Integrated Circuits
Jacks Plugs
Transistors - Fets
Misc Parts
RFtoolkits
Organic 5Watter Kits
Transceivers for 17,20,30,40 Meters
Toroids
Retired Kits
SMT Parts
Contact
FAQ
Build this Hybrid Cascode IF Amp Module with AGC
Production Version Available ~ 22nd January, 2021

Functions & Specs:
50Ω Input & 50Ω Output
~80 dB gain
AGC On/Off
AGC Out (useful for S-Meter)
Both MUTE(+) & MUTE(-)


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


Prototype Schematic:


Production Schematic:


Prototype PCB:


Production PCB:



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 the voltage regulator and remaining 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) Install all five, 3-Pin headers on top of the PCB
   _____ J1,2,3,4,5 - 3-Pin Headers

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
   _____ Wind 5 turns of green magnet wire on the toroid
   _____ 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
T1.jpg

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 13+1 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

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

Toroids, Ferrites