Pull down resistor on this layout

[Outlaws]

I am building an Analogman Sunface, and I was thinking about adding a pull down resistor.  The board is cut and almost fully populated.
http://2.bp.blogspot.com/-kPHpS1i9PYc/U0k1rEh5MzI/AAAAAAAAGrk/jvx6QTwKEsM/s1600/Analogman+Sunface+BC108.png
This one has the 50k clean trim in the layout. I was thinking I could use the "dead" leg of that trimmer to put the 2M pull down resistor to ground. That's totally cool right? I ask there since I have a extra column of holes.  If not I guess I could just run the resistor lead to one of the other two legs of the trimmer.  But I guess what I am asking, is that any of the three legs to the pulldown is kosher as far as I can logically see, correct? Or does it need to be before any resistance in the circuit, thus off the input leg of that trimmer?

[GibsonGM]

You can put it on the bottom side of the board....from input to the ground track right next to it.

The trimmer is wired as a variable resistor, so the dead leg is 'off limits'...that would turn it into a voltage divider.  The pulldown should be the first resistance, and shouldn't be part of the variable R coming after.

[DrAlx]

Why not omit the pulldown resistor by wiring your switch differently?
Nice explanation here...

https://www.mrblackpedals.com/blogs/straight-jive/6629778-what-really-causes-switch-pop

[antonis]

Nice explanation here...
https://www.mrblackpedals.com/blogs/straight-jive/6629778-what-really-causes-switch-pop

Mostly author's personal opinion, I'd say... 

[antonis]

You can put it on the bottom side of the board....from input to the ground track right next to it.

Or right on Input jack, between Tip & Sleeve lugs..

Or omitt it and wire 3PDT switch with IN grounded when effect By-passed..

[DrAlx]

Or right on Input jack, between Tip & Sleeve lugs..

I would have thought that too but the bottom of this ...

http://www.geofex.com/Article_Folders/box_pop.htm

says ...

"Be sure that you have the "pull-down" resistors connected from the input/output capacitors to ground **on the effect board**".

Maybe RG can clarify?

[antonis]

Maybe it should be incorporated in R.G.'s "quirks", like his preference to switch pedal supply via OUT jack ground.. 

[Outlaws]

Why not omit the pulldown resistor by wiring your switch differently?
Nice explanation here...

https://www.mrblackpedals.com/blogs/straight-jive/6629778-what-really-causes-switch-pop

I do ground the input, but I guess I have just gotten into having a resistor too.

[merlinb]

Nice explanation here...
https://www.mrblackpedals.com/blogs/straight-jive/6629778-what-really-causes-switch-pop

Mostly author's personal opinion, I'd say... 

Yep. That guy doesn't have a clue what he's talking about.

[duck_arse]

if you put a pulldown on the jack, and then impose a switch between jack/pulldown and input capacitor, what happens to the cap when the switch is open?

[antonis]

No open or closed switch, Duckie..

Can't get what you say.. 

[duck_arse]

a bypass switch. one that disconnects the input cap (to ground or not) from the input signal. the input signal w/ the pulldown connected.

[antonis]

Then you have a pull-down resistor ready for whatever comes next...     

Well said, Duckie..

[DrAlx]

if you put a pulldown on the jack, and then impose a switch between jack/pulldown and input capacitor, what happens to the cap when the switch is open?

Doh

[MrStab]

just read that Mr. Black article. grounding the effect input removes the need for a pulldown? that makes total sense, never considered it before. i do both. maybe best to leave the pulldown in in case someone replaces the switch someday.

[antonis]

i do both

So do I..

Actually, if a PCB hasn't space (or look ahead) for a pull-down resistor, I also omit it - using a IN/OUT grounding as standar switch wiring..

[merlinb]

grounding the effect input removes the need for a pulldown? that makes total sense

Only if it's make-before-break.

[MrStab]

ah! very good point. i've never looked up that variable on anything other than rotary switches. another reason it's probably best to keep the pulldown in.