Some basic octave screamer questions.

[dreww]

First off, I want to base my design off of the Octave Screamer: http://www.geofex.com/Article_Folders/Screamer%20Octave/tsoctave.htm

I am absolutely new to all of this, and I just have a few questions to modify the design of the Octave Screamer.

How would you go about adding a pot to the gain section, but still maintaining a sound like what is found on the schematics page?
How would I go about maybe adding more transformers into the design for different octave effects (perhaps a fifth up or an octave down)?
And finally, just out of curiosity, what else would you guys do to improve the functionality, because I don't have a lot of extra money to spend on this, and if I'm going to build it I wouldn't mind having a couple of other functions to complement just a level knob.

Also, I was just wondering if someone could clarify which pins are used for what from the TL071 chip.

Thanks a lot for everyone's help.

[snoof]

http://www.diystompboxes.com/wiki/index.php?title=DIY_FAQ#OP_AMP
look here for opamp pinouts...

[aron]

>How would you go about adding a pot to the gain section, but still maintaining a sound like what is found on the schematics page?
How would I go about maybe adding more transformers into the design for different octave effects (perhaps a fifth up or an octave down)?

It does have a pot (a 1M) in the "gain section".

As for a fifth or octave down, I don't think this is easily done.

[dreww]

Ok, I was just getting myself mixed up about the pot.  I was looking over the diagram and three more questions arose.  First off, I am confused about the "P" and "R" boxes on the schematics.  Also, I was searching, and in one of the previous topics about the Octave Screamer ( http://www.diystompboxes.com/smfforum/index.php?topic=4898.0 ) it was mentioned that you could add the circuitry to sort of make it a "sine wave generator" so that the pedal gives an output that sounds like the one in the clip--I was just wondering where the schematics are for that?  Finally, I was wondering if there is anyway to set it up where you could have an On-On-On switch that outputs the overdriven signal that doesn't have the octave, one that does, and one that outputs both the normal overdriven signal and the overdriven signal with the octave effect at the same time.

Thanks for your help.  I have a lot in my schedule and though I don't like it I'm trying to take a more hands on approach to learning all of this.  This is an excellent site and I'm glad I found it.

[aron]

Connect all P's and all R's together on the circuit. P is power, R is probably reference voltage. In any case, connect any points with the same letter together.

re: Sine wave, all this mentions is turning the tone on the guitar all the way down (muting the highs) and using a humbucker pickup when using this pedal.

Just make your switch bypass the transformer after the 22uF cap - go straight to the volume control - or through the transformer for a switchable octave on/off.

[dreww]

Alright, I was messing around with the DIY Layout creator and I was just wondering if this layout looks correct: http://shutter7.com/coppermine/displayimage-163.html .  I know it's a lot of blank space, but I'm just making this a rough draft, and I want to use the conductive marker to make the connections, so I'm trying to really feel it out.

Also, I was wondering where the pins on the trimpot are assigned to.  In the schematic there are only two and I'm trying to imagine why there isn't a third connection.

[aron]

I don't think there are trimpots. Those are intended to be full size pots. There's only the 1M pot if that's what you mean. Just connect the inner lug and one of the outer lugs - ignore the other outer lug.

[dreww]

I hate to keep being annoying with this but I'm really trying to nail down the board design so I can get this project going.  Here is my version 2 in a more compact version: http://shutter7.com/coppermine/albums/userpics/10150/render%7E0.gif

I added a SPST switch so I can turn the octave on and off, and hopefully accurately configured everything.  I was just wondering if this is the proper setup, and if I were to go ahead and build it if it would work.

I do have one question though, with the transformer is the 2k or 10k side the primary side?

Thanks for putting up with my ignorance.

[dreww]

Alright, with all of the annoying confusion that I am having I am just wondering if there are any layouts for this pedal?

[dreww]

I hate to keep coming back to this but I just have a lot of questions.  So I've breadboarded the entire circuit, and I got a really gated sound out of it, so I decided to test the stages of the circuit.  I came upon the transformer and I took it out and just put a 1n270 diode in place of the transformer and two diodes.  The distortion works absolutely fine, but when I put the transformer back in I get the gated sound.  I am stumped as to what the problem could be.