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)

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
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
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
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
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