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Subject: Re: [ModularSynthPanels] Threeler

From: loopcycle <loopcycle@...>
Date: 2008-08-06

for your rotary, you can use either a 2-pole 6-position or a 3-pole 4-position (since you're only going to use four lugs x2 anyway so it doesnt matter).  if you have trouble finding a 2p 6t or 3p 4t switch i can probably make an educated mouser guess for you (i picked up my rotary at a local electronics shop).

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

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+.

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