CONTEST What? Another Contest?

[jimilee]

Okay....here's what I have so far....if you need any detailed analysis just say the word.

Hell yeah, an overdrive!

 

[BuddytheReow]

Here's another ONE from BuddytheReow. I was inspired to give myself another constraint last night when fooling around on my breadboard. I wanted to make a circuit where every component has the number ONE in it somewhere, whether it be a value or part number. Coincidentally I just won ONE of @fig 's contests so this seems fitting here. This is another dirt pedal and is in the heavy gain territory. So much gain that it's a little on the noisy side (think white noise here.) The tone control alters some of that. Speaking of tone control I wanted to see graphically what it's doing so I put this into TSC and came up with this. HUGE mid scoop on it. I did use (2) 10n caps in parallel to satisfy my constraint here. The only comment I should make on the schematic is that you should place the diode in place of R9.

I present to you El Numero Uno by BuddytheReow

 

[Chuck D. Bones]

Interesting, but you have the wrong value for RL in TSC. Should be more like 9K. Is R3 really 10K?

How about a Number 2 design since today is 2/2/22?

And by Number 2, I do not mean

 

[BuddytheReow]

Interesting, but you have the wrong value for RL in TSC. Should be more like 9K. Is R3 really 10K?

How about a Number 2 design since today is 2/2/22?

And by Number 2, I do not mean

Yep. R3 is 10k. Double checked the breadboard pic. It is the second horizontal one from the left.

I still don't understand load resistances yet. Could you give me the quick and dirty?

OMG even deeper scoops

 

[Chuck D. Bones]

Not deeper, just more overall loss. The notch depth is the difference between the bottom of the notch and the flat parts below 100Hz and above 10KHz.

Oh, yeah, you have C1 & C2 swapped in TSC. I refer you to Bill's Law. If your breadboard matches your schematic, then there's not much mid scoop at all.

RL in TSC refers to whatever comes after the TONE pot. There's no place for C12 in TSC, so we'll ignore C12 and pretend it's jumpered. RL is then R19 in parallel with R20 in parallel with Q4's input impedance. For a first-order approximation, Q4's input impedance is R22 times HFE. Let's say HFE = 200, so Q4's input impedance is 200K. 10K, 100K and 200K, all in parallel = 8.7K. So that's RL in TSC.

I already have your other entries simulated in LTSpice, so it won't take much to sim this one.

 

[BuddytheReow]

I already have your other entries simulated in LTSpice, so it won't take much to sim this one.

I haven't tried LTSpice, but it seems like it takes half the fun out of breadboarding. Or maybe it just electronic breadboarding...

BTW this makes more sense now. Most of the pot doesn't do a whole lot, although noticeable, until you're in the more extreme ranges

 

[Chuck D. Bones]

Simulation and test go hand-in-hand. Each does something the other can't do, and each can help you understand what the other is doing.

 

[fig]

Simulation and test go hand-in-hand. Each does something the other can't do, and each can help you understand what the other is doing.

Paradoxical dude!

 

[Chuck D. Bones]

Paradoxical dude!

 

[fig]

How about a Number 2 design since today is 2/2/22?

It seems like it's taken 4-EVER to get here.

 

[Chuck D. Bones]

In observance of Groundhog Day, here's my Deuce-Deuce Fuzz. Only simulated so far, so I can't vouch for its tone. Inspired by BtR's Numero Uno. I had to take liberties with the pots since we don't have 220K pots here in the States. Might work better powered by a 22V battery.

 

[Robert]

Okay....here's what I have so far....if you need any detailed analysis just say the word.

Thief! The LED tester was my design.

 

[fig]

Thief! The LED tester was my design.

Mine was the V1. No fancy acronymic resistance mod

 

[Feral Feline]

Interesting, but you have the wrong value for RL in TSC. Should be more like 9K. Is R3 really 10K?

How about a Number 2 design since today is 2/2/22?

And by Number 2, I do not mean

In observance of Groundhog Day, here's my Deuce-Deuce Fuzz. Only simulated so far, so I can't vouch for its tone. Inspired by BtR's Numero Uno. I had to take liberties with the pots since we don't have 220K pots here in the States. Might work better powered by a 22V battery.

View attachment 22504

That’s very coolio

I drew up a schem for a Pickle/Muff a ways back that was/is all about “2”, too. I chose an MPQ2222 to replace the Pickle’s MPQ3904, and big 2u2 couplers, etc — everything had a 2 in it somewhere, except the pots.

I’m digging your Deuce-Deuce’s Q4, in particular.

 

[Chuck D. Bones]

Q4 is wired as a diode. Looks more exotic than it is. I'm using the C-B junction because it has a higher Vf. I could have left the emitter lead open.

I didn't know there was a quad 2N2222. Learn something new every day.

 

[BuddytheReow]

I had a lot of fun doing this, but I think I’m done. 8 circuits? Wow, I had a bunch of free time last month. Some are better than others, but my inner mad scientist wants others to fire up their protoboards. Don’t want to spoil it for everyone. Or maybe I already have?

 

[Chuck D. Bones]

I've been browsing thru my pedal schematic collection and I've found quite a few 2 and 3 transistor circuit that will fit on a Muffin board.

 

[fig]

Holy crunch time Batman,

Only a week left?!?!

doomed.........dooooooomed

 

[Chuck D. Bones]

That's right Ladies & Gentlemen, one week to go. Still plenty of time to conjure up a winning entry.

 

[jimilee]

Mine may not be winning, but it’s a cool over drive. You’ve pushed us all to go further, higher, faster!