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Changing Pot settings w/Switch?
Posted: Thu Jul 28, 2011 4:22 pm
by Jero
Ok, now I know you can go "full gain" by bypassing a pot with a switch. This is one of the options with the snowflake kit, I believe?
Would it be at all possible to do something similar, but switch to different resistance in the rotation? Say if I wanted to go from 0 gain, to 3/4.
I want something like this on my behemoth, but have yet to email Alan. Would also be nice for some other things

Re: Changing Pot settings w/Switch?
Posted: Thu Jul 28, 2011 4:48 pm
by McSpunckle
You could switch in a resistor across two lugs to lower the resistance...
Or if it's a volume or gain control, you could replace the ground with a resistor so it won't turn down as far.
Re: Changing Pot settings w/Switch?
Posted: Fri Jul 29, 2011 8:57 am
by eatyourguitar
yeah thats what I did on my new feedback looper. I used a 100k pot and a 47k to ground for the volume so when it gets jumpered to bypass the pot, it still has 47k to ground instead of grounded output (no audio)
I think its better to use a DPDT toggle with the resistor values exactly like your favorite setting on the pot. I drew this for you

Re: Changing Pot settings w/Switch?
Posted: Fri Jul 29, 2011 12:26 pm
by culturejam
Or you could have two different gain pots and use the switch to toggle between them.
Re: Changing Pot settings w/Switch?
Posted: Sat Jul 30, 2011 5:12 pm
by Pollinator95
culturejam wrote:Or you could have two different gain pots and use the switch to toggle between them.
I actually made a diagram for that the other day, with a 3PDT switch and a status LED. I can try and upload it if you want, but I guess someone else can easily procure a better version.

Re: Changing Pot settings w/Switch?
Posted: Sat Jul 30, 2011 7:51 pm
by frequencycentral
Two volume controls:

Two volume and two gain controls:

Re: Changing Pot settings w/Switch?
Posted: Mon Aug 01, 2011 8:14 am
by Fuzzrociouspedals
I'm doing what culturejam mentioned on my personal Rat Tail today so I can go b/w low gain to high gain. I would rather have one pedal that can do 2 things that I love than 2 pedals.
My enclosure from mammoth comes today! Stoked!
Re: Changing Pot settings w/Switch?
Posted: Mon Aug 01, 2011 2:11 pm
by Jero
eatyourguitar wrote:yeah thats what I did on my new feedback looper. I used a 100k pot and a 47k to ground for the volume so when it gets jumpered to bypass the pot, it still has 47k to ground instead of grounded output (no audio)
I think its better to use a DPDT toggle with the resistor values exactly like your favorite setting on the pot. I drew this for you

Let me see if I understand, by example, r1&3 would be my gain pot, and r2+4 would be the resistance I want (whatever 3/4 of the sweep measures out to)? That would be ideal if so.
Pollinator95 wrote:culturejam wrote:Or you could have two different gain pots and use the switch to toggle between them.
I actually made a diagram for that the other day, with a 3PDT switch and a status LED. I can try and upload it if you want, but I guess someone else can easily procure a better version.

It's a good idea but for this purpose not what I want/need. The extra pot is another needed part, another hole, and requires more room. Will be good for other DIY pursuits no doubt.
Rick, thanks for posting those diagrams. The first one I could picture in my head, but didn't think about the 2nd.
Re: Changing Pot settings w/Switch?
Posted: Tue Aug 02, 2011 3:03 am
by frequencycentral
Jero wrote:Rick, thanks for posting those diagrams. The first one I could picture in my head, but didn't think about the 2nd.
I know a couple of people have used it in Dr Boogey builds, makes it a two channel device. And totally click-less.
Re: Changing Pot settings w/Switch?
Posted: Tue Aug 02, 2011 10:39 am
by eatyourguitar
Jero wrote:eatyourguitar wrote:yeah thats what I did on my new feedback looper. I used a 100k pot and a 47k to ground for the volume so when it gets jumpered to bypass the pot, it still has 47k to ground instead of grounded output (no audio)
I think its better to use a DPDT toggle with the resistor values exactly like your favorite setting on the pot. I drew this for you

Let me see if I understand, by example, r1&3 would be my gain pot, and r2+4 would be the resistance I want (whatever 3/4 of the sweep measures out to)? That would be ideal if so.
a vol pot works like a voltage divider. but the total resistance from the source to ground remains constant. in this example, measure the pot at lugs 2 & 3 to get the value of R1. measure lugs 1 & 2 to get the value of R3. it makes sense that R1 + R3 = the total resistance of the pot 100k. adjust the volume how you like it and remove the pot to measure it again and get the values for R2 & R4. it still adds up to 100k. its just dividing in a different spot.