Mid Knob for Boss DS-1

[soupbone]

I've been taking out R16,and wiring it to a 5k pot for a mid knob.Is there another way to do it without taking out a resistor?

[runmikeyrun]

I didn't know you could do this!  And where are you mounting the pot on the enclosure?  Are you using a mini pot?

[Mark Hammer]

R16 (6k8) and C12 (100n) form a lowpass filter with a 6db/oct rolloff starting around 234hz.  reducing the value of R16 raises the rolloff corner frequency.  For example, if R16=4k7, f=339hz; if R16=3k9, f=408hz.  So, the smaller the value of R16 gets, the more lower mids are allowed through to the output.  That will also have an impact on volume level since there is a lot of content in that region, and the usual filtering out of that content lowers the total amplitude level.

Given that it's 6k8, you can always wire up a pot in parallel to lower the effective R16 resistance, or you could just use a SPDT on-off-on toggle to add in two other parallel resistances for 3 different rolloffs, depending on the space allowed and your needs.  Putting 18k in parallel with R16 gets you an effective resistance of 4.94k and rolloff at 322hz.  Putting 10k in parallel gets you an effective resistance of 4.05k and a rolloff at 393hz.  I wouldn't describe those as the perfect settings, but they are likely to be audibly different from the stock pedal, using standard resistor values.

[runmikeyrun]

I'm going to bring my DS-1 home tonight from practice and check it out.  I use it on bass so this is a good thing for me to look into.  Even though it's my backup distortion, it's good to have an extra control on there.  One louder, right? 

[soupbone]

I've been using a 5k clarostat pot that's small.I mount it to the side of the pedal.

[soupbone]

R16 (6k8) and C12 (100n) form a lowpass filter with a 6db/oct rolloff starting around 234hz.  reducing the value of R16 raises the rolloff corner frequency.  For example, if R16=4k7, f=339hz; if R16=3k9, f=408hz.  So, the smaller the value of R16 gets, the more lower mids are allowed through to the output.  That will also have an impact on volume level since there is a lot of content in that region, and the usual filtering out of that content lowers the total amplitude level.

Given that it's 6k8, you can always wire up a pot in parallel to lower the effective R16 resistance, or you could just use a SPDT on-off-on toggle to add in two other parallel resistances for 3 different rolloffs, depending on the space allowed and your needs.  Putting 18k in parallel with R16 gets you an effective resistance of 4.94k and rolloff at 322hz.  Putting 10k in parallel gets you an effective resistance of 4.05k and a rolloff at 393hz.  I wouldn't describe those as the perfect settings, but they are likely to be audibly different from the stock pedal, using standard resistor values.

Cool!Thanks Mark!!

[soupbone]

Anybody know how Analogman does it?

[soupbone]

I sent Brian Wampler from Wampler Pedals an email,and he said no,bcause of the circuitry

[runmikeyrun]

Well, i crammed a small pot in there, a 10K that i soldering in place of R16.  It's basically another tone knob, but combined with the stock one allows some pretty cool sounds.  Thanks guys for the tip!

[Mark Hammer]

make sure you have some sort of minimum resistance value in series with the pot (e.g., 470R or 1k), or the control will work funny.

[soupbone]

Do you mean actually soldering it to the mid knob?

[Mark Hammer]

yes.  The cap to ground has to have a resistance in front of it in order to form an RC lowpass filter.

[soupbone]

What size value resistor should i use?The same value that i took out?Also,could you just tack it to the back of the board where the pot is wired in at?or,is that a bad idea?Sorry for all the questions Mark,but would you just solder the resistor to the same lugs as that the wires to the pot are soldered to?Thanks for all your info Mark!I've learned some things i didn't know

[Mark Hammer]

1k is fine.

What I generally do is solder it to one of the lugs of the pot, and slip a piece of heat shrink over it to stabilize it and prevent fracture.  In this instance, 1/8w resistors are your friend.

[soupbone]

So,1 leg of the resistor goes to the pot,but where does the other leg go?Thanks Mark!

[liquids]

What size value resistor should i use?The same value that i took out?Also,could you just tack it to the back of the board where the pot is wired in at?or,is that a bad idea?Sorry for all the questions Mark,but would you just solder the resistor to the same lugs as that the wires to the pot are soldered to?Thanks for all your info Mark!I've learned some things i didn't know

"Boss DS-1 Mods!!!  BOSS DS-1 Mods!!Bone Mod 1=$20.00// Bone Mod 2=$25.00//Bone Mod 2 + Diode Selector Switch=$30.00//Bone Mod 2 + Diode Selector Switch + Midrange Knob=$40.00.Descriptions coming soon!!"