breaded up a son of screamer..however..

[deadastronaut]

heres a DI clip...

signal, guitar, breadboard, passive DI box, mixer..

https://dl.dropboxusercontent.com/u/7464107/WAVES%20FOR%20PELLE/METALSCREAMDI.mp3


doesn't sound as bad DI'd as i thought...hmmmm...

[Ben Lyman]

Haha! I swapped my tone pot for 5k too!

I also tried to figure out a way to eliminate the tone pot altogether but retain the same tone.
Please help me figure out how to do that. The idea is to add the SWTC at the end of the circuit. I did that and it is working really good for me but I need help removing the original tone pot.

I guess the original tone pot reduces gain as it reduces treble and vice-versa, so the only way to get maximum full on distortion is to suffer the extreme highs. If I understand it correctly, the SWTC (or a RAT filter) should simply cut some high end or add the highs back in without affecting the distortion or the bass response.

Therm, Oozviks became an inside joke with my friends when we were kids, they are like leprechauns or menahunes, you blame them for anything that goes wrong.
Yorgi (or Jorgi?) was a John Candy character on SCTV, I'm not sure what Oozviks were but to him but they were some kind of enemy, maybe street thugs or something.

[J0K3RX]

Haha! I swapped my tone pot for 5k too!

I also tried to figure out a way to eliminate the tone pot altogether but retain the same tone.
Please help me figure out how to do that. The idea is to add the SWTC at the end of the circuit. I did that and it is working really good for me but I need help removing the original tone pot.

I guess the original tone pot reduces gain as it reduces treble and vice-versa, so the only way to get maximum full on distortion is to suffer the extreme highs. If I understand it correctly, the SWTC (or a RAT filter) should simply cut some high end or add the highs back in without affecting the distortion or the bass response.

Therm, Oozviks became an inside joke with my friends when we were kids, they are like leprechauns or menahunes, you blame them for anything that goes wrong.
Yorgi (or Jorgi?) was a John Candy character on SCTV, I'm not sure what Oozviks were but to him but they were some kind of enemy, maybe street thugs or something.

look here > http://www.electrosmash.com/images/tech/tube-screamer/tube-screamer-tone-graph.png

[deadastronaut]

cool. so thats the 1k after the first opamp...very handy, cheers jim.


heres where i was,....

[Kipper4]

Was C10 there before?
Mine is squealing like a harpie.
I just checked the 1k 220nf filter corner 723hz low pass.
So I'm not sure what I've done wrong. Except I didn't check which op amp I'm using.
Could be a left over lm358 from the p45 I just broke down.
I can't believe I'm breadboarding a screamer......

[deadastronaut]

no it wasnt... i put C10 in their to tame the highs...no more squeeeeeeellll...


btw i just have the assy clipping at the mo..

i'm just using a 072 at the mo...

[Kipper4]

Ahh yes I should have looked closer.
I have 2x 1n4148
I'll do the red 3mm.

[deadastronaut]

omit C5 ....just noticed i pulled it out , after adding C10

edit: forget that, as we want to use it as a normal TS too...

[anotherjim]

Rob asked earlier about the feedback network input cap sometimes going to ground & sometimes to Vref/Vb. It can go to either but Vb must have good AC bypass capping - if the feedback signal can wobble Vb at all, the feedback signal can be picked up by Vb connections to the inputs of any other amp in the circuit.
Such feedback may be negative or positive depending on signal polarity from that feedback network. If it happens to be positive, you can get instability (oscillations/squeel) at high gains. Or maybe, a little extra sustain if you're lucky? If negative, it could be robbing some gain. This feedback via Vb is most likely to only be at low frequencies when the existing bypass cap is small enough to have significant resistance at those freq's.

Anyway, given good bypass on the Vb, you can return any signal to Vb instead of ground if it makes layout easier; eexxxcept, if this feedback network cap is a polarized type, then use ground so there's always correct polarizing voltage across that cap.

Then if you see a resistor to ground or Vb after a coupling cap, it could be a few reasons.
1: Setting the high pass freq of the cap for bass control.
2: Changing the DC reference after the cap to either ground or Vb or some other.
3: Both of the above.
4: It was copied over from another circuit and kept because it works ok anyway.
5: Any combination of the above.

[J0K3RX]

if you're not enjoying the tone controls all that much you may try the SWTC before the volume pot and see if that works a little better?

[Ben Lyman]

if you're not enjoying the tone controls all that much you may try the SWTC before the volume pot and see if that works a little better?

That's how mine is set up, I like it. I just have to eliminate the pre-existing tone control next, thanks for the electrosmash link, now I can set it as a full treble fixed setting, that will hopefully retain maximum overdrive, then filter some highs with the SWTC

My SD-1 is ready to go, effed-up the paint but it works. I'm going to start fine tuning the "metal-screamer" now.

Rob, you can eliminate one red LED if you adjust the switch a little, have a look and I'm sure you'll see what I mean. Also, try a couple of 1N4148 for symmetrical and see what you think, I am getting a little more compression/distortion/sustain... also with a couple 1N4001 sounds pretty good too

[Kipper4]

Yer that tone pot sucks. I'll stand by the breadboard until the tone pots gives out.
I almost prefer a tone freak severe to a screamer anyways.
Same sh1t different sound....

[Ben Lyman]

Here's my dumbed-down version for us mere Earthlings:

3 knobs, no switches. R1 is still debatable.
EDIT: squeal sorted (470p in loop) and better tone knob! Love it! 

[deadastronaut]

looks cool, you weren't tempted to take C5 to vb then?...


i was recording with this last night, and it really is quite good...

quite versatile too...loves a wah in front too...i'll try your tone control later...cheers .

[Ben Lyman]

looks cool, you weren't tempted to take C5 to vb then?...

I went back and forth to make sure, both seem to work fine... perf layout will have to decide.

quite versatile too...loves a wah in front too...

Your 500K Gain2 makes it way more versatile than without. with my 470K fixed gain there really is no cleanish, light gain sound... only little crunch and big crunch... I gotta try a wah next

i'll try your tone control later...cheers .

Try it, I like it, pot and cap can be adjusted to taste, let me know if a linear pot works better than a log

[deadastronaut]

ive been recording with it the last 2 days...so i can touch it at the mo...

too busy having fun...

[Ben Lyman]

too busy having fun...

Me too. I just broke two strings! I rarely ever play after the first string break but I de-tuned and kept going until I broke another... then I de-tuned even more and kept on going!

I've made some more adjustments to mine, took out the 10K to VB, seems fine. I added a 27K between pin2 and gain pot, keeps it from going all the way down and retains a very nice useable range from 0-10.

Tone cap is now a 3n3 and I am pretty certain a LOG 50K pot will be better.

Also (not pictured) I am currently on ass clipping with 2x 1n914 and 1 red LED, sounds great

[Kipper4]

oops bad post I'll be back

[Kipper4]

Yep the 470pf is a goer. Got yours on the Breadboard now Ben.
Nice work Djents. See what I did there?

[Ben Lyman]

Cool Rich, do you got that tone control and everything?

Uh oh, mine just got a switch 
I also just went all in on the VB tie downs and I think the noise level went down a bit.
My DIYLC layout is almost done, I'm pretty sure this is my final answer...