Introduction: How to Convert Your DS-1 to Keeley All Seeing Eye and Ultra Mods

Picture of How to Convert Your DS-1 to Keeley All Seeing Eye and Ultra Mods

Convert your DS-1 to Keeley All seeing eye and ultra mods. I own and operate the site and wanted to give this information to a wider audience hence making instructables!

Step 1: What You Will Need & Removing Components

For these mods you will need:

  • 0.1uF Capacitor x 5
  • 1uF Capacitor x 4 (or two 0.47uF caps in parallel, it should give the same results)
  • 0.047uF Capacitor x 1
  • 3mm LED x 1 (I bought two so I didn't have to use the one that you take out of the DS-1)
  • on/on SPDT switch
  • 2.4k Resistor x 1
  • 20k Resistor x 1
  • 1.5k Resistor x 1
  • 220pf Cap x 1
  • 47pf Cap x 1

Removing Components
1. Use a flat head screwdriver to lever off the knobs on the DS-1 then use some pliers to unscrew the nuts on the pots.
2. Unscrew the black screws on either side to provide access to the on/off switch
3. Unscrew the nuts on the input jacks
4. Undo all four screws on the base plate
(not shown)
5. Remove base plate, plastic to get to the circuit board.
6. Remove the screw on the LED to the top of the pedal
7. Turn the pedal on its front so you can see where the battery goes. On my pedal, I simply had to push two sides of the clips together and lift out the switch. The wires were soldered through the pedal so I unsoldered the purple and black wires and set the switch aside.

You should now be able to completely remove the circuit from the housing.

Step 2: Removing Components

Picture of Removing Components

Remove C1, C3, C5, C12, C13 - these are silver in colour and look like they are covered in plastic (see below diagram)

Remove C2, C8, C9, C14 - Rather than being silver, these look like small black batteries (see below diagram)

Remove C11, R13, R14, R39, C7, D5 - This is a more mixed bunch, there's some silver caps, resistors and a ceramic cap. (see below diagram)

Step 3: Putting in the New Components

Picture of Putting in the New Components
  • Place a 2.4k resistor in R13
  • Place a 20k resistor in R39
  • Place a 1.5k resistor in R14
  • C1, C3, C5, C12, C13 all need to be installed with 0.1Uf Caps
  • C2, C8, C9, C14 need to have 1uF caps installed (on the referance diagram I used two 0.47uF caps soldered together)
  • C11 needs to have a 0.047uF cap
  • C7 needs to be changed to a 220pf cap

See below diagram for how they sould look in place

  • Solder a 47pf cap across clipping diodes, you will need to look at the below image to see where to solder it.

Step 4: Switching Between the All-seeing Eye and Ultra Mods

Picture of Switching Between the All-seeing Eye and Ultra Mods

Just a little warning - this is the hardest part of the mod.

First of all, its worth noting that it is a lot easier to not use a switch and just leave the pedal in either ASE or Ultra modes. If you just want the All seeing eye mod, you will need to remove D5 and replece it with an LED. If you want the Ultra mod, you will need to put a LED in series with D4 as well as changing D5. Difficult to get your head arround, check the diagram if you want it fixed in one mode.

Adding a switch is a little more complex, take these steps and you should be fine:

1. Undsolder D4 on the right hand side (this is the side with the black stripe on the diode)
and send that wire to the middle lug of the switch.
2. You then wire the + side of the LED to one of the two remaining lugs, it dosn't really matter which one.
The longer leg should be positive (
3. Send a piece of wire from the last remaining lug and the negative side of the LED to the space in D4.

(See 2nd referance diagram)

If you are installing a new check LED, note which side of the LED was + and - and put the new LED in accordingly - if you forget or don't know don't worry it wont damage the LED if you try it both ways. Usually, most 3mm LEDs will work with the current resistor in, but if you are using a 5mm LED change R35 to a 2k4 resistor.

Step 5: Re-Assembly

If you have used a switch this is important, you have to decide where to put it! The most room is on the sides just below the jacks, this however does look kinda clumsy and is kinda difficult to reach. The alternative is on the face of the pedal where all the knobs are. This is a bit more difficult, but looks a lot better. My pedal has the Keeley switch on the front and two more switches on the side (one for circuit bending and the other for switching between two capacitors).

If you want it on the front, be careful when drilling and make sure that you don't damage the components! (I took mine out for this bit) Remember to use a punch so the drill dosn't move (if you don't have a propper one, use a screw).

The easiest way to assemble is probably like this:

  • Bolt the switch to the front of the pedal
  • Attach the ASE LED to the front of the pedal
  • Screw the 'Check' LED to the pedal from the inside
  • Attach the jacks
  • Push the pots through the holes and screw them in
  • Make sure the 9V adapter is in its hole and push the back of the circuit down so the back will screw on
  • If you did any circuit bends and put the switches on the sides, wire them up now and attatch the switches to the side
  • Put the plastic behind the circuit and screw the pedal together!

Step 6: Sound Clips


AustinB61 (author)2016-06-04


if your going to try this make sure i repeate make sure you use 50v caps not 100 150 200 300 w/e because i made the mistake of putting in like 300 600 volt caps and that really sucked the tone out when i hit big chords... just a heads up 50V'S :)

Triworm (author)2013-03-21

hi, this only shows how to add 1 toggle switch but what are the other 2?

Steverules (author)2013-03-18

Hi there, i was looking for how to Keeley and i found this.. but the question is that -- i cannot find actually how it sounds??? can anyone plzz share some sort of audio clip of pedal that has gone through this mod.. so that the decision to try this mod becomes easier.. If you cannot share here plzz email me.. its

galbenchanoch786 (author)2011-12-21

Hey there, I followed the steps for the mod but when putting it back together and testing it out had some difficulties. First of all, the 2nd LED only lights up when I am playing through the pedal, it isn't a constant glow as I anticipated. Second, and the more annoying problem, is that when I turn the distortion up past just about 9 o'clock I get a ridiculous bass growl that persists.. I'm unsure if maybe the cables connecting the switch are too long and causing a grounding problem.. or if maybe I messed up along the way.

strangetoys (author)2011-05-21

I did this mod, everything works perfect except the volume. Volume changes have no effect on output. Any ideas where I should start to look where I messed up? Thanx in advance.

louboutinshose (author)2011-05-17

Very useful and interesting info. Thanks for sharing.

edspegeddd (author)2010-04-05

can someone tell me what the value of the diode is for D4? accidentally broke mine in half trying to take it off :(

Teburon (author)edspegeddd2011-01-19

the non-LED diode? u should be able to look it up on google or something based on the colors of the bands

Filandras (author)2010-06-27

I just finished the mods, and I have a couple of questions: 1. Why would my check light always stay lit, and my switch not work to turn the pedal off? It seems I may have done something putting it back together, I guess. 2. I think my pedal is only in ASEM mode. The LED always flashes, and there is no change when I flip the switch to change to the Ultra Mod. Any insight into this? 3. This thing is outrageously loud now. Is that normal? Thanks for the mod. Some help with these issues and I'll be all set.

Teburon (author)Filandras2011-01-19

i'm just a noob talkin but i think it flashes because it turns off when there is no signal... that's the pattern i noticed when i watched a comparison video on youtube. dunno about ur other question about always being in ASEM mode but i think the vol is suppose to be that loud.. cause before it was quiet and muddy.. if u watch that video you can hear that this mod will make it brighter and fuller

Alarmnbob (author)2010-11-09

This was an easy mod and well written. Sounds great also!

MaxTwang (author)2010-09-25

Instead of soldering the 47pf cap on the bottom of the board, it can be wired in parallel with D4 or D5. The 47pf cap I got was too big for the bottom of the board so I put the capacitor in the holes for D5 and soldered the led to the leads of the capacitor.

guitfidler (author)2010-08-30

I also used a different set of diodes for my clipping section. I used a germanium diode in series with a silicon diode I4001 in d5 then a 5mm led in d4. Sounds really fat and tube like. Reacts well to your playing and cleans up nice with volume control.

guitfidler (author)2010-08-30

To change the high end, there are a couple of components that help. R14 is one but effects the bass as well. The higher the value of the resistor, the lower the highs and the more bass is added. R17 is the next one and the lower the value the lower the less highs you have. Try a 10k in R14 and 2.2K in R17 and see where you are then go from there.

jukes (author)2007-10-31

here is the exact parts list for smallbear electronics.i just ordered it.
Small Bear Electronics Stock List Items
1 Capacitor, Panasonic ECQ-B 100 pf. - 390 pf. (220 pf.) @ $0.30 = $0.30
5 Capacitor, Panasonic ECQ-B .056 mf. - .1 mf. (.1 mf.) @ $0.30 = $1.50
4 Capacitor, CDE DME Series, 1 mf. 100 V @ $0.70 = $2.80
1 Capacitor, Panasonic ECQ-B 470 pf. - .047 mf. (.047 mf.) @ $0.25 = $0.25
1 Capacitor Silver Mica 500V 10 pf. - 150 pf. (47 pf.) @ $0.55 = $0.55
2 LED T-1 3 mm Red, Clear Diffused @ $0.25 = $0.50
1 Switch - SPDT Toggle Mountain Sw MS-550A @ $1.80 = $1.80
1 Metal Film 6.8K To 39K Individual (20K) @ $0.20 = $0.20
1 Metal Film 1.1K To 6.2K Individual (1.5K) @ $0.20 = $0.20
1 1.1K to 6.2K - Individual (2.4K) @ $0.15 = $0.15

coolmantle (author)jukes2010-05-11

 what is the different between
- Capacitor, BC Components, 1 mf. 63V
- Capacitor, CDE DME Series, 1 mf. 100 V
cause i ordered the same one as yours (CDE DME one)
but it looks different than the Keeley one

James Haskin (author)jukes2008-06-07

Dude all you caps are in millifarads!!

Have you already done the mod? How did it sound?

beastmaster (author)James Haskin2010-03-21

Small Bear is kind of weird in the way they list their capacitance values. Instead of using uF or the mu- symbol, they use mF for "micro-farads." This is genuinely confusing since mF in the SI system really means "milli-farads." Since you rarely ever see caps in the milli-farad range (if ever) when working with guitar pedals, I suppose we can forgive them for this little quirk.

I've ordered from them many times before without incident. Just remember mF = uF on their site and everything will be fine. 

fastcar123 (author)2010-03-26

where can i get all this

elbowmanufacturing (author)2010-01-14

Thanks for this super clear instruction; great pictures too!

motorpsych0 (author)2009-12-27

I opted to NOT install the 47pf cap as indicated in the last step here. The pedal still sounded great in both modes.

ivancacevic (author)2009-12-15

Can`t you do this with boss mt-2 please!
Like as you show here on this step by step convert!
And show me have to wiring micro switches!!!


noise_metal_freak (author)2009-11-07


Before I start to vomit blood out of worry, where can I get the parts for this, I keep getting shafted by "minimum orders" OR they just have the cheap stuff. Jukes apparently purchased the "wrong" components from Small Bear. What am I looking for? HEEEEEEEELP!

ak700 (author)2009-10-28

 Does the internal LED (the one that replaces the diode) lit up when the pedal is in operation? The reason I am asking is that when I switch to ultra-mode the sound doesn't change at all (the seeing-eye LED stops working but the sound remains the same ). Also my sound seems a bit compressed even at low distortion levels. At high distortion levels it becomes very crunchy (in a bad way)
Any ideas how to debug ?

Alexbarraclough (author)2009-02-23

If i want to switch between the ASE mod and the ultra mod all i do is just unsolder D4 and do what it says, and just leave D5 or do i need to still remove D5 and replace it with an LED, or have i got this completely wrong and you can't switch between ASE and ultra?

TheGeebs (author)Alexbarraclough2009-10-15

You have it completely wrong.  The switch changes between using ASEand Ultra Mode.  The switch just changes between going straightthrough D4 (ASE) or using D4 and an extra led for extra drive whichconstitutes Ultra mode.

Alexbarraclough (author)TheGeebs2009-10-24

Yep, thought it was wrong. Thanks Geeb unit :) did it how you said and its awesome!

clint5191 (author)2009-09-21

does it matter how many volts they all are?

TheGeebs (author)clint51912009-10-15

I used all 50V components.  Its a maximum voltage rating. 

SuprSpy79 (author)2009-07-21

what are the "type" of components used? Pardon the stupid question but im just getting into learning this stuff. I have seen in custom pedals that use %5 carbon ones. Any input is appreciated.

TheGeebs (author)SuprSpy792009-10-15

You should use metal film resistors.  All the caps should be metalfilm caps except the 220pf cap is a silver mica.  Carbon film arelow quality resistors.  The 5% is called the tolerance or how muchabove or below the specified value it may be.  I chose 1% for allof mine.

SuprSpy79 (author)2009-07-31

anyone notice it still has a bit of that annoying high end?

LeeChavezMusic (author)SuprSpy792009-09-13

It sounds to me like he's using a strat, and when he uses the pedal (on demo 4) it's either the mic is bad on what ever he's using, or bad EQ settings.

irdir (author)2009-08-13

Solve your .mod file convert problems with the following site

Alexbarraclough (author)2009-02-23

have you attached that 47pf cap in the picture of the circuit board, or haven't you. That piece of wire can't be the cap can it?

Lampens (author)2008-11-15

Oh and I went to two electronic stores and I got these small caps for the 0,1 uf caps. The ones in yours are those big green things Mine are more the size of the 47pf cap. The electronics store dudes say that doesn't matter, does it?

Lampens (author)2008-11-15

So you actually have to put in two leds. One in d5 and the other with the switch on d4? Does the d5 go in the O of the tone? Or does the d4 led go into the O of the tone?

mhikofen (author)2008-08-12

can anyone knows,what is the purpose of 47pf cap across the clipping diode,and what is the effect in the mode.thanks

insanecopilot (author)mhikofen2008-09-24

i tried it and it smoothes it out. the tube screamer has it stock.

tpingt (author)2008-07-19

Hi there! Do you think 1/8 watt metal film resistors will be sufficient for the circuit? Or will I have to order the 1/4 watt metal film ones? Thanks

no food please (author)2008-07-07

This is a good instructable. However, I am a little unsure what you mean by "All seeing eye and ultra mods". Is there any way you could explain what the goals of these modifications are a little more? I have played around with some of the modifications in your other instructable and found that they work great.

James Haskin (author)2008-06-12
guitar_gnome (author)2008-03-31

I'm a little confused about the part of this step where you have to solder a 47pf capacitor across clipping diodes...once soldered will the body of the cap be on the green or brown side of the circuit board

jerrysl (author)2007-06-20

Are there any specifics about the parts I need to buy? I went looking for some parts at Radio Shack and there are tantalum capacitors, metalized-film capcitors, ceramic-disc capacitors, and some others. I don't know what impact these different materials have on the outcome of the project but I'd like to be sure so I don't end up turning my DS-1 into a brick. Also, I can't find any 2.4k or 20k resistors, or any 220pf or 47pf capacitors. Are there any sites that have these for cheap?

aetguitars (author)jerrysl2007-07-26

I recommend buying your components from Small Bear Electronics ( Get diffused LEDs, the water clear ones are way too bright. Get the Panasonic Low Voltage Poly Film for the "big" capacitors (uF) and get Silver Mica for the "small" ones (pF). Get metal film resistors. You'll need a 3mm Bezel if you're going to do the SEM mod and want the LED mounted on the pedal's chassis.

jerrysl (author)aetguitars2007-07-29


lp_man (author)aetguitars2007-07-26

I use small bear extensively in building projects, fantastic people who work there! I use water clear ones for check leds because I like them bright and I'm not concerned about battery life because I use a pedal power device. Bezels are difficult to fit sometimes, the plastic ones do ok but I just drill the hole exactly 3mm and it usually stays well.

kubton (author)2007-07-17

my post disappeared some how??? Anyway...

any I made one and it sounds good.


There was this reply:

"lp_man has made the following comment:

Wow looks fantastic! If you use the circuit bending a lot, perhaps look into building a loop box (found here: so that you can leave the ds-1 on at all times but take it completely out of the signal path with the box. Pretty nifty gadget, also has a cool feedback loop in it which sounds crazy!"

You mean like this:


I should do an Instructable for it.


lp_man (author)kubton2007-07-17

Wahey they are back! :)

lp_man (author)2007-07-17

Kubton, I don't know why your messages keep disappearing :S

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