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:

 

Connection (PCB1 Top) Color Length
1. JD8 to LEFT (input) jack - signal wire to  jack tip lug coax 6in
  (coax shield to jack shank lug)    
2. JC8 to RIGHT (input) jack - signal wire to jack tip lug coax 6in
  (coax shield to jack shank lug)    
3. JB9 to PHONES jack left output -  signal wire to jack tip lug coax 4.5in
  (coax shield to jack shank lug)    
4. JA9 to PHONES jack right output - signal wire to jack ring lug coax 5.5in
  (coax shield to jack shank lug)    
5. JD9 to PHONES pot - signal wire to pot lug 3 gang A coax 7.5in
  (coax shield PCB end only)    
6. JB1 to PHONES pot - signal wire to pot lug 2 gang A coax 6.5in?
  (coax shield to pot lug 1 gang A)    
7. JC9 to PHONES pot - signal wire to pot lug 3 gang B coax 6.5in
  (coax shield PCB end only)    
8. JA1 to PHONES pot - signal wire to pot lug 2 gang B coax 6in
  (coax shield to pot lug 1 gang B)    
9. JC1 to STANDARD (A440) pot - signal wire to pot lug 2 coax 8.5in
  (coax shield to pot lug 1)    
10. JC6 to PCB3 JA5 signal only coax 6in
  (coax shield PCB1 end only)    
11. JD6 to PCB2 JA5 signal only coax 6.5in
  (coax shield PCB1 end only)    
Connection (PCB1 Bottom)    
12. +5V Power supply to PCB2 5V buss (per diagram and photos) blue 7in
13. +15V Power supply to PCB2 -15V buss (per diagram and photos) red 7in
14. -15V Power supply to PCB2 +15V buss (per diagram and photos) white 7in
15. Ground to PCB2 Ground buss (per diagram and photos) black 8in

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:

 

Connection (PCB2 Top) Color Length
16. pads to left of "R6" to STD (440) output jack - signal wire to  jack tip lug coax 7.5in
  (coax shield to jack shank lug)    
17. junction of R27, R29, and R30 to BEAT switch middle lug red 6.5in
18. ground buss to BEAT switch bottom lug (this also has R28 which connects to top lug) black 7.5in
19. junction of C25 and R4 (this is what we did)
OR like the second diagram (do this one)
to STD (440) pot lug 3
coax 9in
  (coax shield to ground only)    
20. Pin 7 U3 to STD switch middle lug white 7in
21. ground to STD switch top lug black 9in
22. U10 pin 1 to PCB3 CB3 top hole green 3in
23. U10 pin 6 to PCB3 U11 pin 12 black 2in
24. U10 pin 8 to PCB3 R33 blue 2.5in
Connection (PCB1 Bottom)    
25. +5V Power supply to PCB3 5V buss (per diagram and photos) blue 4in
26. -15V Power supply to PCB3 -15V buss (per diagram and photos) red 4in
27. +15V Power supply to PCB3 +15V buss (per diagram and photos) white 4in
28. Ground to PCB3 Ground buss (per diagram and photos) black 4in

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:

 

Connection (PCB3) Color Length
29. U13 pin 3 to Top LED cathode via 330ohm R green 4in
30. +5 V buss to Top LED anode (the longer lead) blue 4in
31. U13 pin 6 to Right LED cathode via 330ohm R green 4in
32. +5 V buss to Right LED anode (the longer lead) blue 4in
33. U13 pin 8 to Bottom LED cathode via 330ohm R green 4in
34. +5 V buss to Bottom LED anode (the longer lead) blue 4in
35. U13 pin 11 to Left LED cathode via 330ohm R white 4in
36. +5 V buss to Left LED anode (the longer lead) blue 4in

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

 

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