shin-ei fy-2 question dragonfly vero

[jmasciswannabe]

I am building one and was wondering if there was a reason the layout here:

http://www.aronnelson.com/gallery/main.php/v/DRAGONFLY-LAYOUTS_0/album18/album144/SHIN_EI_FY_2_FUZZMASTER_WITH_SCOOP_MOD_VERO.gif.html

is different than the schematic here:

http://hammer.ampage.org/files/modded_fy-2.gif

There is a discrepancy where the volume is placed. I was wondering if this was a fix on the volume issue I have read about or just a mistake on the layout.

[Dan N]

The layout goes south after Q1. Then goes souther.

Um, maybe move C6 back to Q1 and change the Vol 3 spot trace?

http://users.rio.com/senorris/junk/SHIN_EI_FY_2_FUZZMASTER_WITH_SCOOP_MOD_VERO%3f.gif

I don't know. Sometimes I get confused. God bless the modify button.

[jmasciswannabe]

Moving the vol3 to that strip was my conclusion as well to make it like the schematic. I am still wondering if this was done on purpose or if it was a mistake. Guess I will find out soon enough! 

[jmasciswannabe]

Nevermind. I should have never doubted the fuzz messiah. 

Easy solution, which is addressed in my gallery...

connect lug-2 of fuzz knob to lug-2 of volume knob...

no more volume drop....

http://www.aronnelson.com/gallery/d/10835-2/SHIN_EI_FY2_001.jpg

[Dan N]

Nah, keep doubting.

[jmasciswannabe]

Yeah, Dan you are right. It is a mistake. Wired that way it makes the fuzz act like another volume pot. I brought the vol3 down a couple of strips and voila!

There is a vol drop on one end of the scoop. I attempted wiring fuzz 2 to vol 2 but the scoop effect became much less pronounced. I think I will leave it as is or maybe a front end boost could help. I am planning on boxing it up with a montezuma.

[Mark Hammer]

Since the mid-scoop only occurs because of passive loss, you should expect the mid-scooped output to be lower than the non-scooped.  If one wanted to have a footswitch change between scooped and nonscooped tone, you could have the stompswitch insert the added resistance to ground, plus another resistance in series with the volume pot (e.g., 27k, though maybe a 50k trimpot might be best).  That should permit for an instant change in tone without a concomittant change in volume.

Just as a note, my more recent experience indicates that pretty much all the changes to the midscoop are accomplished within about 4-8k of added resistance.  After that, you're just twiddling a pot.  I imagine most folks will be fine with a mere 5k pot.  Though it does not have any octave-doubling, the change in tone between scooped and non-scooped with be very akin to what one hears from the two positions on the Uivox Superfuzz.

The Fuzz control on the FY-2 can be wired either way.  I ended up wiring it as a kind of pan-pot after realizing that the basic circuit was very similar to the Mosrite Fuzz-Rite.  I wired it up that way and liked what I heard.  Feel free to like it more the other way.

[jmasciswannabe]

Yeah, I found the biggest change in tone to occur within that value as well. I think I will be swapping from the 50 to a 10...since I have quite a few of them.

I also found this nugget of goodness (from almost four years ago!) giving me directions on how to wire the pot up. I will most definitely give it a try, as the current fuzz control is near useless. 

The distortion pot on the original is wired up weird.  The collector outputs of the two transistors go to the same pot through different value caps.  The schematic posted around shows one of these going to a side lug, and the other going to the wiper, with the signal heading off to the notch filter through the remaining side lug.  I thought this a little weird, and after noting the resemblance between the Fuzzrite and FY-2 thought I would try it the Fuzzrite way.  Here, the two collector outputs go to the side lugs of the pot, the output signal emerges from the wiper.  The pot is acting like a pan control in this instance, placing varying resistances in series with the two alternate transistor outputs at their mixing point.

Thanks Mark!

This makes more sense and I will give it a go this way. I don't think  I was doing it right before

[Mark Hammer]

Yeah, I found the biggest change in tone to occur within that value as well. I think I will be swapping from the 50 to a 10...since I have quite a few of them.

Feel free to stick a fixed resistor in parallel with whatever pot you use, so that the max resistance and range of adjustment work in favour of maximum dialability.  For instance, sticking 15k in parallel with a 10k pot gets you a 6k max resistance.

[Renegadrian]

Resurrect this thread - I noticed that error too!
You'd have to place volume 3 just a row above fuzz 2 (C18)
C6 must go to B of Q1 and not Q2.
C8 has to go to ground (place a jumper A9-G9) (only for the scoopless standard version)

It should be ok that way!