Modular Synth Panels

Your switch will use four of those points on the pcb:

+V
ground
a0
a1

Hm, a 2-pole 5-position...so you should have two poles and ten positions total (five for each pole).  If so, you will only be using 8 of those positions (four for each pole).  Match up each pole with the first four switching points for that pole.  For example:

i used a 2-pole 6-position switch (2 poles in the center and 12 positions on the outside).  The positions were labeled 1-12.  I used positions 1, 2, 3, 4 for pole 1 and positions 7, 8, 9, 10 for pole 2.  So, when my switch was in the following positions A/B/C/D, where

A 3LP
B 2LP/1HP
C 1LP/2HP
D 3HP

...then

A  ::  pole 1 > 1  ::  pole 2 > 7
B  ::  pole 1 > 2  ::  pole 2 > 8
C  ::  pole 1 > 3  ::  pole 2 > 9
D  ::  pole 1 > 4  ::  pole 2 > 10
(positions 5, 6 are unused, so lugs 5, 6, 11, 12 left alone)

Here's how I made my connections:

a0 -> pole1
a1 -> pole2

strapped:  
ground -> 1, 3, 7, 8
+V -> 2, 4, 9, 10

After strapping the points on the switch, I just ran one wire for +V and one wire for ground back to the PCB.



*REMEMBER the preceeding example was for my switch.  If you have a five-position switch these will be different...probably something like:

A  ::  pole 1 > 1  ::  pole 2 > 6

B  ::  pole 1 > 2  ::  pole 2 > 7

C  ::  pole 1 > 3  ::  pole 2 > 8

D  ::  pole 1 > 4  ::  pole 2 > 9

Use your continuity checker on your DMM to make sure your results match these before you proceed.  If this is correct, then...

a0 -> pole1

a1 -> pole2



strapped:  

ground -> 1, 3, 6, 7

+V -> 2, 4, 8, 9
(position 5 is unused, so lugs 5 and 10 will be left alone.)

Does this make sense?








--- On Thu, 8/7/08, adaaxs <wonggster@...> wrote:
From: adaaxs <wonggster@...>
Subject: [ModularSynthPanels] Re: Threeler
To: ModularSynthPanels@yahoogroups.com
Date: Thursday, August 7, 2008, 8:16 AM










    
            Your explanation is over my head.  I only see 6 connection points left on my pcb: 2 

ground, a0, a1, V+, V-. and another ground at the other end.  I have a 2pole 5 position 

switch.



> 

> you have to extract the switch wiring from the schematic.  you will be switching between 

four combinations of +V and ground (two bit binary combinations) .  at a0, positions 1 and 

3 are connected to ground, and positions 2 and 4 are +V.  at a1, positions 1 and 2 are 

connected to ground and positions 3 and 4 are connected to +V.  i strapped the ground 

and +V connections to each other on the switch, ending up with only one +V and one 

ground wire from the switch to the PCB.

> 

> i did order a component kit from scott and im glad i did--it made the build go 

smoothly.

> 

> 

> 

> --- On Wed, 8/6/08, adaaxs <wonggster@. ..> wrote:

> From: adaaxs <wonggster@. ..>

> Subject: [ModularSynthPanels ] Threeler

> To: ModularSynthPanels@ yahoogroups. com

> Date: Wednesday, August 6, 2008, 8:58 AM

> 

> 

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>     

>             I think I am feeling a bit dumb today. Or I am excited to get this up.

> 

> I am wrestling with this threeler and have some basic questions.  The first thing is that I 

> 

> realise that I have no understanding of how to  spec out or buy a rotary switch. If 

anyone 

> 

> knows of a simple way of expressing what to get I would be pleased. I see a 2 pole 4 

position 

> 

> switch but nearly every 4 position switch I see is 3 poles. I don't get it and I am stuck for 

a 

> 

> switch.  

> 

> 

> 

> I also can't see 2 of the the wiring points for the switch unless it is A0, A1, V-, V+.

> 

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> Is there a BOM for this puppy ?

> 

> 

> 

> Also is it cool to sub a 150pf for the 180 pf ?

> 

> Same question  for 47pf or 68pf forthe 56pf? 

> 

> 

> 

> best

> 

> 

> 

> g

>