The DoD death metal pedal is a really great pedal but it is incredibly noisey and has no gain control.
Could I simply put a pot on the clipping diodes to vary the clipping effect and ultimately gain a bit of control over the gain?
Really great pedal but undedr rated. Had they added the gain control and used cleaner chips than the 4558, I think this would be the only pedal everyone used...
Could I simply put a pot on the clipping diodes to vary the clipping effect and ultimately gain a bit of control over the gain?
Really great pedal but undedr rated. Had they added the gain control and used cleaner chips than the 4558, I think this would be the only pedal everyone used...
yes you definatly can put in a gain control
here is the schematic
I would take out the 120k feedback resistor from the second opamp (before the diodes) and replace it with a 20k resistor in series with a 100k pot. That would vary signal level fed to the diodes thus controlling the amount of gain. You can make up the lost level by turning up the volume.
If you find that at a new gain setting you like there is not enough volume at the output of the pedal, then the 22k feedback resistor on the forth (and last) opeamp can be replaced with something of greater value.
also the 4558's can be swapped with just about any other opamp you like of better value, i have been meaning to do the same thing with my DoD grunge pedal.. but i only use that as a solo booster anyway as the tone is horrible, so prob never will.
let us know how it goes though if you do!
here is the schematic
I would take out the 120k feedback resistor from the second opamp (before the diodes) and replace it with a 20k resistor in series with a 100k pot. That would vary signal level fed to the diodes thus controlling the amount of gain. You can make up the lost level by turning up the volume.
If you find that at a new gain setting you like there is not enough volume at the output of the pedal, then the 22k feedback resistor on the forth (and last) opeamp can be replaced with something of greater value.
also the 4558's can be swapped with just about any other opamp you like of better value, i have been meaning to do the same thing with my DoD grunge pedal.. but i only use that as a solo booster anyway as the tone is horrible, so prob never will.
let us know how it goes though if you do!
Hey thanks for all the input. I had posted on the DIY stomp box forum and it seems someone has passed around and posted the schematic for such a mod but your input offers plenty of help as well as more options.
I plan to do it but one problem, the PCB has broken free from the wires connecting to the power source, in/out and stomp switch. Needless to say I'm in quite a pickle. I may just pick up a 2nd one off of ebay and eyeball it that way seeing as I want a second of this pedal anyway.
As far as the 4558's are concerned, I urge everyone to avoid this chip like the plague! It's praised but I find it to be awful in every application I have tried. Nothing about it's performance, sound coloring or level of ridiculous noise seems useful in any way. The NE5532 seems to be the most transparent and overall best performer from every angle you can judge a dual op amp in a guitar gear application. Specs are almost identical to a 12AX7. Next is the OPA2604 and the OPA2228. Bother offer a thicker tone and I believe the 2604 gives a nice mid hump and the 2228 gives a nice bass hump...or vice versa😀
All I know is I'm still a novice in the Frankenstein stage of things but I've spent a loooooot of time toying with countless op amps in a small variety of circuits....too much time
I plan to do it but one problem, the PCB has broken free from the wires connecting to the power source, in/out and stomp switch. Needless to say I'm in quite a pickle. I may just pick up a 2nd one off of ebay and eyeball it that way seeing as I want a second of this pedal anyway.
As far as the 4558's are concerned, I urge everyone to avoid this chip like the plague! It's praised but I find it to be awful in every application I have tried. Nothing about it's performance, sound coloring or level of ridiculous noise seems useful in any way. The NE5532 seems to be the most transparent and overall best performer from every angle you can judge a dual op amp in a guitar gear application. Specs are almost identical to a 12AX7. Next is the OPA2604 and the OPA2228. Bother offer a thicker tone and I believe the 2604 gives a nice mid hump and the 2228 gives a nice bass hump...or vice versa😀
All I know is I'm still a novice in the Frankenstein stage of things but I've spent a loooooot of time toying with countless op amps in a small variety of circuits....too much time
interesting, just last week i repaired my dod grunge pedal after the wires came off the end of teh cct board.. i traced the schematic through and found out what they all were..
I'll post the order of the wires in the weekend, there's a pretty high chance it will be identicle.
I'll post the order of the wires in the weekend, there's a pretty high chance it will be identicle.
ok, looking at the top of the circuit board, the conenctions are (from left to right)
1. input signal
2. output signal
3. +ve LED terminal
4. switch
5. +9V
6. ground
1. input signal
2. output signal
3. +ve LED terminal
4. switch
5. +9V
6. ground
Hey thanks for the help optical. I'm suspecting it's not the same configuration but I'll give it a try. I had managed to label a couple tabs before all wires had broken free and so far those 2 do not match but anythings better than nothing.
...If all else fails I'll start playing the wire lottery😀
...If all else fails I'll start playing the wire lottery😀
on hindsight i may have that list backwards..
but the 9V and ground will be next to each other, so look for the power diode
the input and output can be worked out from teh schematic, look for the 10uF cap on the output, and the 120pF cap on the input, they are usually quite distinctive. then the switch and LED are pretty easy from there.
but the 9V and ground will be next to each other, so look for the power diode
the input and output can be worked out from teh schematic, look for the 10uF cap on the output, and the 120pF cap on the input, they are usually quite distinctive. then the switch and LED are pretty easy from there.
death metal pedal
i was just wondering if you could help me with my pedal. my setup is like this:
amp - cry baby wah - death metal pedal - guitar
but my wah doesnt work right when the pedal is switched on. i tried putting the wah after the pedal and that was even worse.
please help.
i was just wondering if you could help me with my pedal. my setup is like this:
amp - cry baby wah - death metal pedal - guitar
but my wah doesnt work right when the pedal is switched on. i tried putting the wah after the pedal and that was even worse.
please help.
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