RANDOM*SOURCE
RANDOMSOURCE.NET
5
Serge NTO
Building
This is simply a suggestion - you might find a different workflow more practical:
1.
Solder the trimmers and the power connector onto the main pcb.
2.
Solder the 470nF film cap onto the panel pcb. This capacitor is to remove any DC offsets from the signal
going into the (black) Linear FM input. It is in parallel to a 100n C0G cap already installed (increasing a
470nF cap effectively to 570nF), so even if you do not install the additional film cap, the LIN FM should
still work. The size of this cap (combination) affects the behavior of (very) low frequency signals going in,
however, there is another capacitor later in the audio path, so the effect is limited. Also, for normal audio
rates, it should not make much or any difference, only if you use frequencies like 20Hz. So no need to
worry about the size of this cap much. 470nF should work fine.
3.
Solder pins and install 2 jumpers in the middle of the panel pcb setting the direction of the Portamento
knob. Make sure you install the pins on the right side (not where the pots and jacks sit) so that you can
change them without having to unmount the panel pcb.
4.
Add spacers / standoffs (10mm) to the panel pcb. Spacers are not really necessary as the connectors
firmly hold the main pcb anyway, but if you choose to add them, this is a good time.
5.
Main pcb and panel pcb are to be connected through precision SIP socket and pins. It is recommended
to use the pins on the main pcb (facing down, soldered from above) and the pin sockets on the panel
pcb (standing up, soldered from the front panel side). Break or cut off the pieces you need and stick them
together so that main pcb and component pcb form a nice sandwich (don‘t solder yet). Check that you
didn‘t leave out any pins / holes and that the sockets are all on the same side (panel pcb). Also make sure
the pcbs have the right orientation (so that the pots will sit outside!). Solder all the pins in while keeping
the sandwich together - this avoids any misalignments.
6.
Carefully separate the sandwich - if you used precision sockets, this may not to too easy - they stick
together nicely (giving a good connection).
7.
Mount the Thonkiconn jacks and the potentiometer onto the panel pcb. Pots should sit on the printed
side - this side faces the front panel.
Don‘t solder them in yet.
8.
Carefully mount the pcb (with the pots and jacks inserted) onto the front panel. You may then have to
wiggle each pot a bit to get the pots through. Make sure the threads of the pots go through completely
and the pots sit right at the front panel. Screw the jacks and pots onto the panel.
9.
Once everything is nicely in place, solder the pots and jacks onto the pcb (while the front panel is at-
tached).
10. Mount the main pcb onto the panel pcb and fasten it using screws / spacers if desired.
11. Connect a power cord sup12V, GND, GND, -12V to the power-header on the main board and
double check the direction of the power header before you turn power on. You should be ready to go :-)
