CW Monitor Introduction

CW Monitor Schematic

CW Monitorschematic

CW Monitor Bill of Materials

Stage Bill of Materials

(resistor images and color codes courtesy of WIlfried, DL5SWB's R-Color Code program)

CheckCountComponentMarkingCategoryOrientationNotesCircuit
❏21 k 1/4W 1%br-blk-blk-br-br br-blk-blk-br-br1/4W CW Monitor
❏610 k 1/4W 1%br-blk-blk-r-br br-blk-blk-r-br1/4W CW Monitor
❏1100 1/4W 1%br-blk-blk-blk-br br-blk-blk-blk-br1/4W CW Monitor
❏2100k 1/4W 1%brn-blk-blk-orng-brn brn-blk-blk-orng-brn1/4W CW Monitor
❏11R 1/4W 1% (1R)brn-blk-blk-silver-brn brn-blk-blk-silver-brn1/4W CW Monitor
❏12k2 1/4W 1% (2.2K)red-red-blk-brn-brn red-red-blk-brn-brn1/4W CW Monitor
❏2330 1/4W 1%ora-ora-blk-blk-brn ora-ora-blk-blk-brn1/4W CW Monitor
❏147K 1/4W 1%yel-vio-blk-red-brn yel-vio-blk-red-brn1/4W CW Monitor
❏34K7 1/4W 1% (4.7K)yel-vio-blk-brn-brn yel-vio-blk-brn-brn1/4W CW Monitor
❏1JRC27F/012 relayJRC27F/01212V relayRelay JRC27F/012 12V CW Monitor
❏510 nF (.01uF)103 103Ceramic CW Monitor
❏9100 nF104 104ceramic CW Monitor
❏2LM741 OpAmpLM741DIP-8 CW Monitor
❏1DPDT SwitchDPDTS4 CW/SSB/Digimode SwitchCW Monitor
❏11 uF/25Vdc Electrolytic CW Monitor
❏1100 uF/25Vdc Electrolytic CW Monitor
❏33.5mm stereo jack - PCB mountjack CW Monitor
❏1misc hookup wiremisc  CW Monitor
❏1BC546 NPN Transistor TO-92 CW Monitor
❏2BC556 PNP Transistor TO-92 CW Monitor
❏110K (Y103)Y103trimpot  CW Monitor

CW Monitor Summary Build Notes

CW Monitor Detailed Build Notes

Top of the Board

CW Monitor Top View

Install Resistors

Install Resistors photo
CheckDesignationComponentMarkingCategoryOrientationNotes
❏R761R 1/4W 1% (1R)brn-blk-blk-silver-brn brn-blk-blk-silver-brn1/4W
❏R54100 1/4W 1%br-blk-blk-blk-br br-blk-blk-blk-br1/4W
❏R40100k 1/4W 1%brn-blk-blk-orng-brn brn-blk-blk-orng-brn1/4W
❏R41100k 1/4W 1%brn-blk-blk-orng-brn brn-blk-blk-orng-brn1/4W
❏R6330 1/4W 1%ora-ora-blk-blk-brn ora-ora-blk-blk-brn1/4W
❏R7330 1/4W 1%ora-ora-blk-blk-brn ora-ora-blk-blk-brn1/4W
❏R311 k 1/4W 1%br-blk-blk-br-br br-blk-blk-br-br1/4W
❏R431 k 1/4W 1%br-blk-blk-br-br br-blk-blk-br-br1/4W
❏R422k2 1/4W 1% (2.2K)red-red-blk-brn-brn red-red-blk-brn-brn1/4W
❏R564K7 1/4W 1% (4.7K)yel-vio-blk-brn-brn yel-vio-blk-brn-brn1/4W
❏R3010 k 1/4W 1%br-blk-blk-r-br br-blk-blk-r-br1/4W
❏R3310 k 1/4W 1%br-blk-blk-r-br br-blk-blk-r-br1/4W
❏R3610 k 1/4W 1%br-blk-blk-r-br br-blk-blk-r-br1/4W
❏R3810 k 1/4W 1%br-blk-blk-r-br br-blk-blk-r-br1/4W
❏R6610 k 1/4W 1%br-blk-blk-r-br br-blk-blk-r-br1/4W
❏R7710 k 1/4W 1%br-blk-blk-r-br br-blk-blk-r-br1/4W
❏R354K7 1/4W 1% (4.7K)yel-vio-blk-brn-brn yel-vio-blk-brn-brn1/4W
❏R554K7 1/4W 1% (4.7K)yel-vio-blk-brn-brn yel-vio-blk-brn-brn1/4W
❏R3447K 1/4W 1%yel-vio-blk-red-brn yel-vio-blk-red-brn1/4W
❏E14310K (Y103)Y103trimpot 

Install Capacitors

Install Capacitors photo
CheckDesignationComponentMarkingCategoryOrientationNotes
❏E17710 nF (.01uF)103 103Ceramic
❏E17910 nF (.01uF)103 103Ceramic
❏E21310 nF (.01uF)103 103Ceramic
❏E21410 nF (.01uF)103 103Ceramic
❏E24010 nF (.01uF)103 103Ceramic
❏E123100 nF104 104ceramic
❏E176100 nF104 104ceramic
❏E178100 nF104 104ceramic
❏E182100 nF104 104ceramic
❏E19100 nF104 104ceramic
❏E199100 nF104 104ceramic
❏E210100 nF104 104ceramic
❏E55100 nF104 104ceramic
❏E60100 nF104 104ceramic
❏E1281 uF/25Vdc Electrolytic
❏E81100 uF/25Vdc Electrolytic

Install Connectors and Active Components

Solder the remaining components for Phase 5. Pay attention to the locations of BC556 and BC546 transistors and the alignment/orientation of the OpAmps IC uA741!

Install Connectors and Active Components photo
CheckDesignationComponentMarkingCategoryOrientationNotes
❏E113.5mm stereo jack - PCB mountjack
❏E153.5mm stereo jack - PCB mountjack
❏E83.5mm stereo jack - PCB mountjack
❏E184LM741 OpAmpLM741DIP-8
Take ESD precautions
❏E59LM741 OpAmpLM741DIP-8
Take ESD precautions
❏E13JRC27F/012 relayJRC27F/01212V relay
Relay JRC27F/012 12V
❏E185BC546 NPN Transistor TO-92
❏E131BC556 PNP Transistor TO-92
❏E262BC556 PNP Transistor TO-92

Install Wires and Switches

Install Three Temporary Wires

Install the three temporary wires, presented as dotted lines in the graphic. These can be installed on either the topside or the underside of the board, according to the builder's preference.

  • Provide DC power to this circuit. This can be accomplished in two ways:
    • Remove the previously installed temporary Vin and GND wires from the upper right-hand corner of the board. And install temporary connections (+12-13.8v dc power lines (+Vin and GND) as shown in the diagram;
    • Alternatively, leave the existing Vcc connection (in the upper left-hand corner of the board) and connect the positive side of that connection to the point indicated on the graphic, "jumpering" the +12Vdc to the CW Monitor circuit (e.g., with a clip lead)
  • Install connector wire to patch CW Monitor audio
    • cw monitor connector wire
Install S4 - CW/SSB/Digimode Switch

Using an SPST (or DPDT acting as SPST) switch, connect the switch and wires as shown in the graphic. (S4 is represented variously on in the G40 docs as S3; switch designations were reworked to adjust for the duplication of S1 in earlier phases)

Install Wires and Switches photo
CheckDesignationComponentMarkingCategoryOrientationNotes
❏S4DPDT SwitchDPDT
S4 CW/SSB/Digimode Switch
❏wire4misc hookup wiremisc 

CW Monitor Testing

CW Monitor Test

Test Setup

  • Plug in headphones and CW key
  • Connect power (either via newly added temporary wires or via existing Vcc connection and jumper wire)
  • Adjust the CW sidetone volume with the trimmer Y103 (10K) while holding the key down.
    • Turning the trimmer clockwise REDUCES volume
    • Turning the trimmer counter-clockwise INCREASES the volume.
CW Monitor Test