R.G. Keen Mutron wiring question

[Onion Ring Modulator]

Hello, I am attempting to build the Keen Mutron clone, and having trouble understanding the wiring for the rotary switch with the documentation available. How do I figure out which pole goes to which connection?



Full doc:
http://www.geofex.com/PCB_layouts/Layouts/neutronpub.pdf

[GGBB]

Rotary switch? There is no rotary switch that I am aware. Are you talking about the hi/lo/band-pass switch? That's a 3PST switch which is the same as most DPDT on-on-on switches (although you could use a rotary switch if you wanted). Kind of like wiring two SPDT on-on switches in series. Have a look at the Mad Bean Naughty Fish for a better idea of how it works (download the zip from here: https://www.madbeanpedals.com/projects/archives/index.html). Anyway, the key point is that it's a 3PST switch - one common and three switched connections.

EDIT: Duh! Of course the original uses a rotary switch! I was thinking about clones - the Naughty Fish specifically - which usually use one of the aforementioned DPDT on-on-on switches as a 3PST instead of a rotary.

[idy]

Keen's diagram shows several switches:
Mode: LP/BP/HP
Direction: up/down
Range: high/low

Range and Direction are both two pole, two position
Mode is single pole, three position.

It doesn't matter which pole you use. Rotaries are available as 1 pole 12 position, 2 pole 6 position, 3 pole 4 position. You could use either the 2 pole or three pole for the two DP switches.

All these have little washers with tabs that you use to limit the number of throws.

The poles on each switch are identical, usually labeled "A,B,C" on a three pole. If you need two, pick any two.

Need more detail?

[Onion Ring Modulator]

I guess I'm confused by all the unlabeled wiring.


Here we have what I believe is one of the rotary switches.

...but the parts list says I need two 3PST Rotary. I don't see where the other one would go.

I believe these are the connections for the two DPDT toggles. Does it matter which of these unlabeled connections go to which switch?






Thanks!

[Onion Ring Modulator]

Keen's diagram shows several switches:
Mode: LP/BP/HP
Direction: up/down
Range: high/low

Range and Direction are both two pole, two position
Mode is single pole, three position.

It doesn't matter which pole you use. Rotaries are available as 1 pole 12 position, 2 pole 6 position, 3 pole 4 position. You could use either the 2 pole or three pole for the two DP switches.

All these have little washers with tabs that you use to limit the number of throws.

The poles on each switch are identical, usually labeled "A,B,C" on a three pole. If you need two, pick any two.

Need more detail?

You explained it all while I was writing my previous post. Thanks!

So maybe the need for 2 rotary switches was a typo?

[idy]

It appears the need for two rotaries is a typo.

You will notice there is a dotted line connecting the two poles of each double pole switch.

The layout diagram shows four "poles" in a row close above the board. The two left-most have a dotted line connecting them. The two to the right also, they are further apart. These dotted lines tell you the poles go together.

In all cases the lower terminal, with the arrow pointing from it, is the "center" of a switch pole. The other two terminals seem to be consistent that left and right are the two positions. The switches are drawn so range is "low" and sweep is "up". if you are using dpdt toggles, we number the terminals like this:
1   4
2   5
3   6

The drawing shows the "arrows" pointing to terminals 1 and 4 on both switches. (you could also use 3 and 6, turning it upside down changes nothing.)

Better?

[GGBB]

A DPDT on-on-on toggle wired as a 3PST is probably simpler. The wiring is as follows. The connection between terminals 3 and 5 is a jumper added by you, terminals 1, 4, and 6 are the three connections to HP, LP, and BP, and terminal 2 is the common terminal connected to the bypass switch:



Check your actual switch's datasheet to be sure - this is taken from an E-Switch catalogue.

[Onion Ring Modulator]

Thanks folks, great info as always!

My ADHD brain tends to skim right over things like that dotted line.