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Old 26th June 2012, 05:13 PM   #31
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Wow, that's some serious scope creep.
what does this mean?
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Old 26th June 2012, 06:11 PM   #32
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Sorry, I didn't mean to skate away from your questions, I just wanted you to see all those schematics if you hadn't already. There are lots of good ideas to be found and blended to get what you want.

Definitely op-amps are the most popular device for simplicity and flexibility. You can do whatever you want. You can buffer with JFETs, BJT's, whatever. As Minion pointed out (I totally forgot about this point, been in tube land lately) you need to be aware of input impedance. You don't want to create any terribly mismatches. You could even buffer with an op-amp and drive a JFET for the overdrive sound. I've seen a few pedals like that on Schematic Heaven.
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Old 28th June 2012, 01:41 PM   #33
shanx is offline shanx  Canada
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Quote:
in what order would be best. ex. buffer high/low pass filter stage 1 gain EQ stage 2 gain high/low pass filter? anything im missing ?
That is a good start for the layout. You can introduce clipping at stage 1/stage 2 either in feedback loop (like tube screamer) or right after the op amp output decoupling cap (like MXR, DOD, etc...) Your input buffer should stay relatively clean and introduce a bit of boost to drive subsequent stages. If you get into hard clipping too early in the stages, you lose sonic detail. Red LEDs give a nice crunch, I like the older inefficient types, they have a softer edged clip. Subjective opinion (!)
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Old 28th June 2012, 03:28 PM   #34
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Quote:
Originally Posted by shanx View Post
Red LEDs give a nice crunch, I like the older inefficient types, they have a softer edged clip. Subjective opinion (!)
This is an interesting point. Like I said earlier I never really played around much with diodes, just had some germaniums lying around and they sounded good to me. I wonder about slower/faster LEDs, or infrared LEDs.

Damn you guys, you're going to get me back onto the pedal design boat instead of the tube amp design boat that I've been riding this year. hahaha...
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Old 28th June 2012, 03:45 PM   #35
shanx is offline shanx  Canada
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Damn you guys, you're going to get me back onto the pedal design boat instead of the tube amp design boat that I've been riding this year. hahaha...
Oh yes I know exactly what you mean! I did a thread here on a distortion pedal build, and ended up using a DIP switch with various clipping elements..that way I could ''taste test'' them in all different combos. Even from one playing style to another I had my different personal preferences. But I like the layout of a prebuffer/stage 1 / eq/stage 2 and post filter..as that give quite a lot of flexibility from my experience. I had built a clean boost/buffer pedal which I always run in front of the overdrive and it fattens everything up nicely.
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Old 28th June 2012, 05:53 PM   #36
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That sounds great. I like the idea of on-the-fly selectable crunch modes. I've got a design that I started about 9 years ago and played with the bread board version in a band for 6 months. haha... I never actually finished it, so maybe I should recreate that and get some PCB's made up.
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Old 28th June 2012, 08:13 PM   #37
shanx is offline shanx  Canada
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It certainly helps to be able to evaluate different tones. Freeminimika is developing the circuit for a certain signature tone, so there needs to be a bit of tuning of filter values, gains and clipping methods. I read some online rumours which might be cool to try:
For a ''darker'' tone on the MXR type circuit, you could try piggybacked 741s, literally stacked pin for pin on each. I think it shifts the corner frequency of the hi pass pre-emphasis, adds some power and complexity to the op amp gain circuit.. it is only a few additional cents to build it like that. Or with TL07x could work the same.
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Old 29th June 2012, 03:26 AM   #38
shanx is offline shanx  Canada
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From a player point of view, I shoulda checked out nu-metal sound a bit more. I still think your layout is good. you need to look at scooping out mids after the buffer pre stage. Your low E to low A strings need to be crunchy, tight and hard clipped. A lot of symetric clipping going on down there. Little softer in the mids so the EQ scoop should lessen the clipping effect in later stages. But you need to look at a serious bottom end boost cause that is where it is going on. highs are clipped but more even harmonics, asymetric clipped. Doozerdave, talking about multi stage, that is how you do it. Introduce the right amount of overdrive clipping in the different stages with the right tone shaping.
I would have a look at Thor (runoffgroove.com) and it has the bass boost circuit. From the sound clips I heard, it sounds like what you are going for , but maybe a generation of metal before. Some minor tweeks, maybe play with that and tune the EQ to taste. Or use as a basis for your own sound.
I will say this respectfully, yes a high gain clipping circuit is in order but no matter what style you play: if you clip ''across the board'' you will get a one dimensional sound, basically a square wave. Where you place the EQ and pre or de-emphasis will matter a lot to the sound you are after.
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