Bill and Will's Synth
Tellun 867 Tuner (with DJB-A440)
& Headphone Monitor Construction
Page 3 - Connections

July 2010 -

This is Page 3 of our Tuner construction documentation and it documents the connections needed between the PCBs and to the panel controls and jacks.

We left off work on this project back in December 2008 and didn't get back to it until July 2010 - a year and a half hiatus.  We went back over the build so far and then reviewed Scott Juskiw's User guide.  Here we go:

Table of Contents

This documentation has become so long that we've broken it into three separate pages and sections within them.  Here's a table of contents that we hope will make it easier to traverse them:

Beginning and End

background - presents an explanation and Scott Juskiw's initial description of the module with a photo

Parts - presents a Bill of Materials and notes about it

Panel - presents the MOTM format panel

Mounting Bracket - our home-built custom bracket

Snack

Construction Done

Set up / Testing

Use notes

MUUB Construction Page

Construction PCB 1 - MUUB4

Construction PCB 2 - MUUB3

Construction PCB 3 - MUUB3

Connections Page (this page)

PCB Connections - wiring the PCBs together

Panel Wiring - connecting the PCBs to the panel

Wires for Panel and inter-PCB Connections

We decided to solder the wires to the PCBs next.

PCB 1

Here are diagrams (top and bottom) and table of the wires for PCB1:

Of these wires, four (Wires 5, 7, 10, and 11) we prepared for the shield to solder into the PCB only - the other end will have only the signal wire:

you may notice that we removed those errant jumpers at RA6 & RB6

PCB 2

Here are diagrams (top and bottom) and table of the wires for PCB2:

This top diagram shows where we soldered wire #19.

And this diagram shows the better placement of wire #19 there's a jumper bringing the signal to this spot and everything (all the other wires are the same).  And this one is more elegant - so use this one:

Of these wires, one (wire 19) we prepared for the shield to solder into the PCB only - the other end will have only the signal wire:

that #19 wire - you can see it above - we stripped long but trimmed the shield back so it was about 3/8in - the result was that the longer, signal wire snaked past the exposed resistor leads quite nicely while the shorter shield held it in place.

we ended up soldering the blue, +5V wire into a different place on the buss that in our diagram 'cause it was easier to get at.

PCB 3

Here are diagrams (top and bottom) and table of the wires for PCB3:

PCB Connections

Top Connections

OK - the next step was to make the connections between the PCBs.  This is described in Scott's 867 User's guide section 5.5.  This drawing illustrates these connections:

Bottom Connections

Next we did the bottom connections.  This is described in Scott's 867 User's guide section 5.4 "Power Considerations."

Install the ICs

We'd left the ICs out of their sockets - it was time to install them

PCB1

PCB2

And it was this moment when we realized the conflict with the 14-pin ICs and developed our little tricky solution.

PCB3

Panel Wiring

Next is the wiring that's between the PCBs and the pots, switches, LEDs, and jacks on the panel. This is described in Scott's 867 User's guide section 5.6 "Panel Wiring."

Here are Scott Juskiw's Photos of these connections.

  
images from Scott Juskiw

BEAT and STD Switches

We started by soldering the wires to the BEAT switch

the bottom switch lug is connected to the top lug via a 10K ohm resistor

Then the STD switch

LEDs

We soldered 330 ohm resistors to the longer anodes of the four LEDs

Then installed the LEDs into the panel

Jacks

Then the jacks, installed the switches, and the pots

Go back to Page One - beginning and end

Go back to Page Two - MUUB Construction