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Old 11-10-2014, 07:32 AM   #91
Matthijs
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Saw that on FB, cool stuff!
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Old 11-10-2014, 01:55 PM   #92
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Failed breadboard attempt. I'm going to try putting the much easier to confirm stages like the BMP stuff onto Veroboard and work from there tomorrow. Still not that certain on the first stage.

EDIT: Few things fixed. Many things learned. Should work now.
https://drive.google.com/file/d/0B7L...ew?usp=sharing

EDIT 2: Attempted again. Failed breadboard. I'm thinking human error this time. The veroboard idea is looking good. Might have to grab the veroboard parts tomorrow.
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Last edited by Crowella; 12-10-2014 at 03:24 AM.
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Old 12-10-2014, 09:01 PM   #93
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So any updates?
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Old 12-10-2014, 10:21 PM   #94
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So the revision 1.08 is what I would say the circuit is, despite not having built it yet, I can't see there being any more errors or issues. I'm setting up a sim of the circuit using some software at uni (LTspice) right now. No idea how long that will take to get running for the whole thing.

Basically, I am guessing a little with the first stage, but it seems to be a germanium Sziklai paired Dallas Rangemaster circuit for treble boosting connected to a tweaked Big Muff Pi with an emitter follower/output buffer similar to a Tubescreamer's buffers.

The distortion pot sets the "sustain" for the BMP and simultaneously the volume for the Rangemaster type circuit. This is why you get no output when the dist is down and absolutely insane amounts of gain when it's turned up. Only pedal I've owned that can feedback so easily. It'd be quite interesting to see someone split up both circuits with two different pots so you can adjust them individually.

I suck at putting circuits on a breadboard apparently but I'd prefer to be using the boards here at uni rather than my really tiny one at home which when you're putting more than five connections into a node, can really make life difficult.
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For thy toan, the BigSky, and the morning glory are yours for now and for ever.
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Old 12-10-2014, 11:11 PM   #95
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So it's basically a treble booster going into a buffered Big Muff? That's quite surprising!
You know the octave effect on it? Is it up or down?
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Old 12-10-2014, 11:19 PM   #96
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Octave up. It kind of just adds a small amount of octave to the signal, nothing too menacing.

Just tested the switch. 10dB level drop when engaged. Did DPTP want to confirm that with the new first stage? It could well be the case, just might not be noticeable once you've pushed it through a BMP.

Second stage ("sustain"/BMP) acts as a low pass filter so now it's starting to look a bit more friendly. With the switch it boosts around 160Hz to about 12KHz with a peak around 14dB at 1KHz, when the dist pot is at 10k/90k, so 90%

EDIT: Using a Tone Stack Calculator, you have a very "boring" tone control setup. It boosts the treble quite a bit in that but overall with the caps selected in the BMP itself, it really doesn't do too much. What I had done in LTspice matches what DPTP got.

Basically, what happens is the front of the circuit absolutely nerfs the bass of the BMP otherwise you'd end up with a BMP that's effectively a treble cut. This way, it makes it more of a band pass circuit. The capacitors in the BMP are chosen to let as much bass through as possible. This balancing act kind of works pretty well but you still end up with a more treble based circuit. Intriguing.

Also, may have the tone wired the wrong way in the schematic.

EDIT: The tone controls the "Q" of the pedal. It goes from 600Hz when off and goes through to about 1kHz when all the way up. Frequencies after 5KHz are reduced when the tone is off, when the tone is on, frequencies after 10KHz are cut off, so you end up with those airy frequencies with tone. There isn't much addition to the bass between amounts.

ANOTHER EDIT: I put some of the frequency plots in the imgur folder, trying both a standard NPN transistor (no octave feedback in that mode I would assume) and the pairing.
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Our father, Who art in Strymon, Metal Zone be thy name; Thy toan will come; Your klon be done; On stage as it is in bedroom. Give us this day our daily song. And give us our telecasters, as we forgive those that cannot impress us. And lead us not unto buffers, but deliver us true bypass.

For thy toan, the BigSky, and the morning glory are yours for now and for ever.

Last edited by Crowella; 13-10-2014 at 02:08 AM.
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Old 13-10-2014, 05:55 AM   #97
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In my sims it seemed like the switch only lowered the input impedance but did nothing else.
(in my eyes the switch parallels R16 with R17 and R18 with R19 in both cases halving the original resistance)
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Old 13-10-2014, 06:59 AM   #98
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I fixed the transistors up since your sim if you wanted to try again?
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For thy toan, the BigSky, and the morning glory are yours for now and for ever.
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Old 13-10-2014, 07:32 AM   #99
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Quote:
Originally Posted by Crowella View Post
I fixed the transistors up since your sim if you wanted to try again?
I just tried the new (ver 1.08) input stage and it doesn't work according to LTSpice.

Is this the right circuit for stage 1?
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Old 13-10-2014, 07:42 AM   #100
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Hmm, strange. I got it working right away. Strange circuit but the potentiometer does what it says on the tin.

(aware the pulldown resistor value is wrong)

http://i.imgur.com/9FDAuzH.png

Playing with the switch does virtually nothing to the shape of the 1KHz signal.
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Our father, Who art in Strymon, Metal Zone be thy name; Thy toan will come; Your klon be done; On stage as it is in bedroom. Give us this day our daily song. And give us our telecasters, as we forgive those that cannot impress us. And lead us not unto buffers, but deliver us true bypass.

For thy toan, the BigSky, and the morning glory are yours for now and for ever.

Last edited by Crowella; 13-10-2014 at 08:00 AM.
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Old 13-10-2014, 11:46 AM   #101
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Double post. Meh.

Those with LTspice can try my schematic. It has been adjusted to allow for 2n3904/2n3906 transistors.
https://drive.google.com/file/d/0B7L...ew?usp=sharing

Dat realisation when you spent over $500 on a Dallas Rangemaster going into a Big Muff pi... It's a little more involved than that but that's the basics of it.
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Our father, Who art in Strymon, Metal Zone be thy name; Thy toan will come; Your klon be done; On stage as it is in bedroom. Give us this day our daily song. And give us our telecasters, as we forgive those that cannot impress us. And lead us not unto buffers, but deliver us true bypass.

For thy toan, the BigSky, and the morning glory are yours for now and for ever.

Last edited by Crowella; 13-10-2014 at 12:39 PM.
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Old 13-10-2014, 05:10 PM   #102
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Schem still looks a bit odd. No bias resistor to q3 base, it's biased to ground by the leakage of q1??
Otherwise, it looks like a pretty standard booster, taking the output from the emitter of q3 inverts the phase relative to.the input.
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Old 13-10-2014, 08:12 PM   #103
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Yeah, I know it seems strange. Do you mean because it acts like this?



I just wired this first stage up and it works. High pass filter that breaks up a little bit. The trimpot just adjusts the boost.
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Our father, Who art in Strymon, Metal Zone be thy name; Thy toan will come; Your klon be done; On stage as it is in bedroom. Give us this day our daily song. And give us our telecasters, as we forgive those that cannot impress us. And lead us not unto buffers, but deliver us true bypass.

For thy toan, the BigSky, and the morning glory are yours for now and for ever.

Last edited by Crowella; 14-10-2014 at 04:12 AM.
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Old 14-10-2014, 11:35 AM   #104
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Confirm this bitch!

I need those germaniums though. The silicon's are fine, but they don't have that distinct attack that makes this pedal.
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Our father, Who art in Strymon, Metal Zone be thy name; Thy toan will come; Your klon be done; On stage as it is in bedroom. Give us this day our daily song. And give us our telecasters, as we forgive those that cannot impress us. And lead us not unto buffers, but deliver us true bypass.

For thy toan, the BigSky, and the morning glory are yours for now and for ever.
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Old 14-10-2014, 02:13 PM   #105
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Interesting. Correct me if I'm wrong but, doesn't every germanium have slightly different values even if it's the same type?
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