LJUNGGREN 2xVCX Manual Download

Page: 7 / 13

Step 8

Flip PCB2 to the bottom side. Solder the power header. Make sure the key opening is oriented

in the same way as in the picture below. It's easier to avoid bent pins if you attach the power
cable in the header while you are soldering.

CON1

2x5pin

Step 9

Flip PCB2 to the bottom side. Now it's time to solder trimmers. They are not sensitive to
mounting direction.

TRbal1, TRbal2

50R multi turn trimmer 2pcs

TRgain1, TRgain2

50k multi turn trimmer 2pcs

Summary of Contents for 2xVCX

Page 2: ...PCB pictures PCB1 PCB2 ...

Page 3: ...des are sensitive to mounting direction make sure the stripe on the diode match the stripe on the silkscreen D1 D2 D3 D4 D5 D6 1N4148 6pcs Step 2 Solder resistors Resistors are not sensitive to mounting direction R10 R12 R16 R17 R19 R20 100K 6pcs R21 R22 R29 R31 R47 R48 10K 6pcs ...

Page 4: ...R23 R24 R27 R28 22K 4pcs R25 R26 R30 R32 470R 4pcs R45 R46 10R 2pcs ...

Page 5: ...y protection diodes Diodes are sensitive to mounting direction make sure the stripe on the diode match the stripe on the silkscreen D7 D8 1N5818 2pcs Step 4 Solder ceramic capacitors Ceramic capacitors are not sensitive to mounting direction C3 C4 C5 C6 C9 C10 C11 C12 100nF 8pcs ...

Page 7: ... picture below It s easier to avoid bent pins if you attach the power cable in the header while you are soldering CON1 2x5pin Step 9 Flip PCB2 to the bottom side Now it s time to solder trimmers They are not sensitive to mounting direction TRbal1 TRbal2 50R multi turn trimmer 2pcs TRgain1 TRgain2 50k multi turn trimmer 2pcs ...

Page 8: ...the web for IC orientation U2 U3 TL074 TL084 2pcs U4 LM13700 1pcs Leave PCB2 on the side with the PCB to PCB connectors not soldered Now it s time for PCB1 Step 11 Solder resistors Resistors are not sensitive to mounting direction R1 R2 R3 R4 R5 R6 R7 R8 R37 R38 R39 R40 R41 100k 13pcs R42 R43 R44 1k 3pcs ...

Page 9: ... C8 100nF 4pcs Step 13 Solder IC sockets and insert IC s Match the IC sockets indent marking pin 1 side with the silk screens If you feel the least uncertain on the IC direction please search the web for IC orientation U1 14 pin DIP socket DIP 14 U5 8 pin DIP socket DIP 8 U1 TL074 TL084 U5 TL072 TL082 ...

Page 10: ...mfortable Step 15 Put the pin socket strips into each other Place them between PCB1 and PCB2 in their respective places Take a firm grip with a plier around the spacers and screw the screws into place If the nuts gets loose tighten them again Remove them again after the pin socket strips are soldered Solder the connectors ...

Page 13: ... the A1 input 2 Set the toggle at the right B A position turn OFFSET 1 knob to 0 and CV attenuator 1 knob to 100 3 Patch VCO to CV1 input and adjust TRbal1 for minimum CV feed through on OUT1 4 Move VCO patch cable to B1 input turn OFFSET knob to 100 and adjust TRgain for minimal amplitude on OUT 5 Repeat until satisfaction Do the same for the second channel 2 Finished module ...