Messages

Do i change the 220n c12 to 47n or 470n? Thanks!

I dunno, just thats what it does in the rebote unless i am imagining things.
It goes to the lug 2 of the Repeats pots (which is 20k). I think typically its a switch of something like 11k and 15k.

But that said, apparently the DBD is less like the rebote so I would go with Brians suggestions over mine.

thanks man. i'll try to put a DPDT and put on the 5.1k and something lower he he

Have you tried adding a resistor in series with the feedback pot and making it switchable?

not yet. havent tried it yet.. might try as well. what resistor value would you recomend? thanks!

You can try lowering R15 from 5k1. Socket it for experimentation.

thanks brian! i really want this oscillation mod like in rebote hehe!

is there any mod for the sea urchin like the endless repeats like the rebote have? thanks!

hello i just wanna ask if are there any substitutes for TLO71? is LM741 ok for that? what are other replacements thanks.. i really want to make this pedal

Pretty much on point, I think

http://www.diystompboxes.com/smfforum/index.php?topic=92976.0

thank you very much!
i was just wondering how do i apply this mod to my chunk2 layout?
im not that good though in electronics i'm a bit of a noob a lil slow..

uhmm could anyone help me how to mod the chunk2 to have 2 channel volumes.. so there would be 2 switches, that would be "ON" and the other is for the "volume channel A/B". thanks

Well, it's an easy question but fundamental to understanding how to build effects, so it's good that you asked!

You can always substitute linear for audio and vice-versa. This will never cause your effect to become inoperable. What it can change, though, is how a control responds. There are two reasons we use audio tapers. One is that an audio taper attempts to mimic how the human ear responds to small changes in volume. We hear perceived changes in volume on a logarithmic (ie exponential) scale rather than a linear one. So, rather than creating a 1:1 correspondence between resistance on the pot wafer and rotation of the pot shaft, the audio taper breaks it down into two parts. The first part uses more resistance in the first half of the rotation and the second part uses less. This means as you turn the pot up halfway, you have traveled a little more than half the value of the pot's total resistance. Turning it up further means you use up the remaining resistance in less space: this is close (although not exact) to a logarithmic scale.

The second reason we use audio taper pots is that with some controls, it is better have more control over one half of a pot than another. For instance, in a Fuzz Face, the standard pot for the fuzz control is a 1kB. However, a common complaint with this effect is that all the Fuzz bunches up at the very end of the control. In this case, using a reverse-audio taper (the opposite relationship of what I described above) evens it out. Less resistance is used in the first half of the control, and more resistance is used in the second. This gives you greater control over small changes in Fuzz, which makes it a much more useful control overall.

So, using a linear as a sub for audio can change how the control responds. It could be unoticable, or it could be bothersome, depending on the set up you are using. Note that you can turn a linear pot into somewhat of an audio pot by using an additional resistor. By placing a resistor across lugs 3 and 2 of a linear pot, you are in effect reducing the overall resistance on one half of the taper (remember that putting resistors in parallel reduces their overall value). So, if you took a 100kB pot, and put a 47k resistor across lugs 3&2, you have essentially shifted a larger portion of the resistance to the first half of the taper---i.e. an audio pot.

thank you very much brian i just put a 22k between lugs 2 and 3 and it worked well thanks!
another question though....
how do we convert a linear pot into a reverse audio? hehe
i built a slambox but i used a 5k linear pot, i wanted it to be almost a work alike of a reverse audio like what in the layout says..
thanks again!

hello everyone im just new hear and im asking a noob question...

here it goes...

at our place the audio taper pots arent available only the linear ones...
what if the schematic requires a audio log pot but i substitute a linear pot
will there be a big difference? what would that be..
sorry for the noob question thanks

hello good day!
im just new here also in DIYing,
i'm building a slambox and i only have a DPDT in hand
but i dont know how to wire it ,,,
and would i need a millenium bypass for LED indicator?
it would bring a lot of help especially with the diagrams of with or without millbpass. thank you very much!