NPN Gus boost in clipping section of Overdrive!

[The French connection]

Hello! I've done a tube screamer TS-808 with rotary switching for 6 different clipping and the first clipping is jumper for a clean boost but it's not really boosting without changing so much the setting of the pedal. So, i've build the beginner npn boost from this forum and i was wondering what it will do if i put this little construction in the clipping stage (in place of my jumper on my breadboard clipping)? Is it gonna work and is it going do to something interesting? How did i wire it? From In boost to straight Out? I know it's a lot of question but i'm almost a noob so be indulgent

Merci!

Dan

[Elektrojänis]

Hello! I've done a tube screamer TS-808 with rotary switching for 6 different clipping and the first clipping is jumper for a clean boost but it's not really boosting without changing so much the setting of the pedal.

Hmmm... I think that for a clean boost you should just leave the diodes out instead of conecting a jumper in there. A jumper will set the gain of that stage to 1 (that means no voltage gain at all).

So, i've build the beginner npn boost from this forum and i was wondering what it will do if i put this little construction in the clipping stage (in place of my jumper on my breadboard clipping)? Is it gonna work and is it going do to something interesting? How did i wire it? From In boost to straight Out? I know it's a lot of question but i'm almost a noob so be indulgent

Do you mean that you would put the booster in to the feedback loop of the opamp (replacing just the diodes with it)? In that case it might do something interesting, but it probably will not act as a clean boost when connected that way.

[The French connection]

Hmmm... I think that for a clean boost you should just leave the diodes out instead of conecting a jumper in there. A jumper will set the gain of that stage to 1 (that means no voltage gain at all).

Yeah! I know i've made an error with that jumper...thanks for the info that's really helpful!

Do you mean that you would put the booster in to the feedback loop of the opamp (replacing just the diodes with it)? In that case it might do something interesting, but it probably will not act as a clean boost when connected that way.

Yes i want to put the booster in place of the diode. Does it gonna work? How do i wire it? Did i have to put a voltage (V+) on the booster? I'm not sure how to do it. I think i'm going to do a scheme...

Thanks a lot! 

Dan

[DougH]

It's not going to work in the feedback loop. Look in the wiki for tutorial links and read up on how op amps work.

[Elektrojänis]

Yes i want to put the booster in place of the diode. Does it gonna work? How do i wire it? Did i have to put a voltage (V+) on the booster? I'm not sure how to do it. I think i'm going to do a scheme...

Well as Doug pointed out, it is not going to work... At least not if you want anything fairly normal sounds out of it. It might make some oscillations and other noisy stuff... So... If you are into teh noisy stuff, then it might be worth trying. It also might just make the whole thing to mute itself.

If you just want overdrive/distortion or boost or both, it is more usefull just use the NPN-boost and the screamer separately. Making it possible to switch the diodes in and out might also be usefull (especially if you like the mid boost that the screamer produces).

[raulgrell]

Just put a resistor instead of a diode... That should make it boost. A jumper wouldn't work because it would have complete negative feedback (not sure if that's the right terminology in english)... put a resistor in there, not sure of the value, just experiment....

[The French connection]

It's not going to work in the feedback loop. Look in the wiki for tutorial links and read up on how op amps work.

Thanks! I think i've got lecture to do!

Dan

[Elektrojänis]

put a resistor in there, not sure of the value, just experiment....

In this case there is no need for extra resistor, because it is allready there... It's the gain pot! Just taking the diodes out will work and gain pot will still let you control the gain.

[petemoore]

  Mahn try that boost right in front of the TS.
  Guitar>Boost>TS.
  [all-three-and-amp common grounded]

[The French connection]

  Mahn try that boost right in front of the TS.
  Guitar>Boost>TS.
  [all-three-and-amp common grounded]

You're absolutely right! That's just because i did'nt have an enclosure in hands so i want to try something but it's a waste of time. So i'm gonna make it old school! Thank you all for the cue!

Dan