2xVCX version 1.0. Calibration instructions can be found on the last page. Capacitor bypass MLCC X7R mm pin pitch

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Vincent McDaniel
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Produced by: Roll Your Own ljunggrenaudio.com Schematic & PCB Design by: KYMATICA DEVICES www.kymatica.com xvcx version.

1 Produced by: Roll Your Own ljunggrenaudio.com Schematic & PCB Design by: KYMATICA DEVICES xvcx version.0 Bills Of Material Bold = PCB C C C3 C4 C5 C6 C7 C8 C9 C0 C C C3 C4 CON D D D3 D4 D5 D6 D7 D8 J J J3 J4 J5 J6 J7 J8 J9 PCB_CON_ PCB_CON_ PCB_CON_ PCB_CON_ Pcv Pcv Pofs Pofs Q Q R R R3 R4 R5 R6 R7 R8 R0 R R6 R7 R9 R0 R37 R38 R39 R40 R4 R R R9 R3 R47 R48 R3 R4 R7 R8 R5 R6 R30 R3 R4 R43 R44 R45 R46 R9 R R3 R4 R5 R8 R33 R34 R35 R Capacitor bypass MLCC X7R.5.54mm pin pitch Capacitor electrolyte mm pin pitch, 0uF 5mm dia, max 0mm height. Min 5V. IDC 0-pin IDC 0 pin power connector (x5 pin) N448 Signal diode N588 Schottky diode (or N587, N589) 3.5mm jack Thonkiconn 3.5mm jack socket 8 pin header male PCB connector PCB (x8 pin) 8 pin header female PCB connector PCB (x8 pin) 00k Linear Pot Alpha/Song Huei 9mm k Linear Pot Alpha/Song Huei 9mm 0-5k BC557B PNP transistor k 0k k 470R k 0R 00k SW SW TRbal TRbal TRgain TRgain U U U3 U4 U5 U U U3 U4 U5 3 3 on-off-on 50R 50k TL074 LM3700 TL07 DIP4 DIP6 DIP8 00nF Resistor /4W % ca 7mm long Resistor /4W % ca 7mm long Resistor /4W % ca 7mm long Resistor /4W % ca 7mm long Resistor /4W % ca 7mm long Resistor /4W to 5% ca 7mm long Resistor /4W % ca 7mm long SPDT on-off-on mini toggle switch. Mouser# 08-MS3TB3MQE-EVX Trimpot Bourns 396W or equivalent Trimpot Bourns 396W or equivalent DIP-4 quad op-amp (or TL084) DIP-6 dual OTA DIP-8 dual op-amp (or TL08) IC Socket IC Socket IC Socket 4 Calibration instructions can be found on the last page. PCB spacer mm Knobs 6 to 0 pin IDC ribbon cable Panel

2 PCB pictures PCB PCB

Assembly instructions We start with PCB.

D, D, D3, D4, D5, D6 N448 6pcs Step Solder resistors.

3 Assembly instructions We start with PCB. Step Solder small signal diodes. Diodes are sensitive to mounting direction, make sure the stripe on the diode match the stripe on the silkscreen. D, D, D3, D4, D5, D6 N448 6pcs Step Solder resistors. Resistors are not sensitive to mounting direction. R0, R, R6, R7, R9, R0 00K 6pcs R, R, R9, R3, R47, R48 0K 6pcs

4 R3, R4, R7, R8 K 4pcs R5, R6, R30, R3 470R 4pcs R45, R46 0R pcs

R9, R, R3, R4, R5, R8, R33, R34, R35, R36 00k 0pcs Step 3

D7, D8 N588 pcs Step 4 Solder ceramic capacitors.

5 R9, R, R3, R4, R5, R8, R33, R34, R35, R36 00k 0pcs Step 3 Solder power polarity protection diodes. Diodes are sensitive to mounting direction, make sure the stripe on the diode match the stripe on the silkscreen. D7, D8 N588 pcs Step 4 Solder ceramic capacitors. Ceramic capacitors are not sensitive to mounting direction. C3, C4, C5, C6, C9, C0, C, C 00nF 8pcs

Step 5 Solder IC sockets. Match the IC sockets indent (marking pin side) with the silk screens.

U, U3 4 pin DIP sockets (DIP-4) IC's will be mounted later.

Electrolytic capacitors are sensitive to mounting direction.

6 Step 5 Solder IC sockets. Match the IC sockets indent (marking pin side) with the silk screens. If you feel the least uncertain on the IC direction, please search the web for IC orientation. U, U3 4 pin DIP sockets (DIP-4) IC's will be mounted later. pcs U4 6 pin DIP socket (DIP-6) pcs Step 6 Solder electrolytic capacitors. Electrolytic capacitors are sensitive to mounting direction. Put the long pin in the hole marked with a + (anode) on the silkscreen. The opposite side - (cathode) is marked with fully filled silkscreen. C3, C4 0µF pcs Step 7 Solder transistors, transistors are sensitive to mounting direction. Match the curved side on the transistor with the curved side in the silkscreen. Q, Q BC557B pcs

Step 8 Flip PCB to the bottom side. Solder the power header.

while you are soldering. CON x5pin Step 9 Flip PCB to the bottom side.

7 Step 8 Flip PCB 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. CON x5pin Step 9 Flip PCB to the bottom side. Now it's time to solder trimmers. They are not sensitive to mounting direction. TRbal, TRbal 50R multi turn trimmer pcs TRgain, TRgain 50k multi turn trimmer pcs

PCB to PCB connectors not soldered. Now it's time for PCB.

8 Step 0 Insert the ICs in the sockets. If you feel the least uncertain on the IC direction, please search the web for IC orientation. U, U3 TL074/TL084 pcs U4 LM3700 pcs Leave PCB on the side with the PCB to PCB connectors not soldered. Now it's time for PCB. Step Solder resistors. Resistors are not sensitive to mounting direction. R, R, R3, R4, R5, R6, R7, R8, R37, R38, R39, R40, R4 00k 3pcs R4, R43, R44 k 3pcs

C, C, C7, C8 00nF 4pcs Step 3 Solder IC sockets and insert IC's.

9 Step Solder ceramic capacitors. Ceramic capacitors are not sensitive to mounting direction. C, C, C7, C8 00nF 4pcs Step 3 Solder IC sockets and insert IC's. Match the IC sockets indent (marking pin side) with the silk screens. If you feel the least uncertain on the IC direction, please search the web for IC orientation. U 4 pin DIP socket (DIP-4) U5 8 pin DIP socket (DIP-8) U TL074/TL084 U5 TL07/TL08

Step 5 Put the pin & socket strips into each other. Place them between PCB and PCB in their respective places.

10 Step 4 Mount the spacers with the nuts on PCB. You can have the screw-side on PCB as well if you feel that it's more comfortable. Step 5 Put the pin & socket strips into each other. Place them between PCB and PCB 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.

Step 6 Cut off the small metal tab sticking out on the potentiometers.

Mount washer and nut on each potentiometer. Make sure the nuts are tight.

In that case you don't need any washer or nut under the panel.

11 Step 6 Cut off the small metal tab sticking out on the potentiometers. Use a cheap plier/nipper for this step, save your expensive ones for other tasks. Mount washer and nut on each potentiometer. Make sure the nuts are tight. Sometimes we ship the kits with Alpha potentiometers and they are cleasly marked with "Alpha". In that case you don't need any washer or nut under the panel. Step 7 Place potentiometers, jacks and switches in their positions but wait with soldering until the front panel is mounted. You will need to bend the ground pins a little bit on the jacks.

Step 8 Place the front panel on top and add washer and nut to each potentiometer and jack, nut to the switches. Use a socket wrench to avoid scratching of the frontplate.

The switches have their own nuts, Make sure to keep them separate from the jacks nuts as they look very similar and the switch nuts will fit on the jacks but the jack nuts won't fit on the switches.

12 Step 8 Place the front panel on top and add washer and nut to each potentiometer and jack, nut to the switches. Use a socket wrench to avoid scratching of the frontplate. The switches have big pad holes to allow more different switches to fit but it also means you need to be extra careful to make sure the switch is aligned straight. The switches have their own nuts, Make sure to keep them separate from the jacks nuts as they look very similar and the switch nuts will fit on the jacks but the jack nuts won't fit on the switches. Now you solder all panel components in place. Step 9 Now attach PCB to the module and screw the spacers together like in step 4-5. Remember the firm grip with the pliers. Mount the knobs. Now attach the power cable with the stripe indicating pin on the -V side.

Cablibration For best result, let the module warm up with power on for 0-30 minutes before calibration. Use either your hearing or an oscilloscope. ) Patch an unconnected cable to the A input.

13 Cablibration For best result, let the module warm up with power on for 0-30 minutes before calibration. Use either your hearing or an oscilloscope. ) Patch an unconnected cable to the A input. ) Set the toggle at the right (B>A) position, turn OFFSET knob to 0% and CV attenuator knob to 00% +. 3) Patch VCO to CV input and adjust TRbal for minimum CV feed-through on OUT. 4) Move VCO patch cable to B input, turn OFFSET knob to 00% and adjust TRgain for minimal amplitude on OUT. 5) Repeat until satisfaction. Do the same for the second channel (). Finished module!

Ljunggren Audio Roll Your Own Penta

Ljunggren Audio Roll Your Own Penta Version: Penta 1.0 Bills Of Material Bold = PCB1, The rest = PCB2 Type Parts Des cription Pow er header Qty Value 1 2x5pin POWER Euro pow er connector Jack 1 3.5mm J1,