Ross Compressor Vero Layout Verified??

[TrentC]

Hi guys,
New to forum here. I am working on a Ross compressor and was wondering if this layout has been verified.
http://www.aronnelson.com/gallery/main.php/v/Toneys-Album/Rossv4.jpg.html

Thanks!
Trent

[frokost]

Welcome! And yes, it's verifired. I built that.

[TrentC]

Thanks Frokost. I appreciate it. did you do the fuzz central mod on it? If so, where do those three resistors go. I'm a little confused with the mod.

[frokost]

The layout already has the resistors in place. They're in the upper left corner. The 39K goes directly on the switch as shown.

[TrentC]

Ah I see now. Thanks for the help!
Trent

[suregork]

I am building one of these right now, and I noticed that the orientation of C13 is wrong. Shouldn't it be the other way around? (C13 is the 1uF capacitor between the two 220k resistors)

[frokost]

Wow, you're absolutely right. Nicely spotted! I'll have to replace that one myself then.

[frequencycentral]

C13 looks correct to me, check out this schematic from GEOFEX, it's the same: http://www.geofex.com/FX_images/rosscomp.gif

[suregork]

yes, but on the vero layout, the positive leg of c13 goes to ground, while on the geofex, tonepad, and fuzz central schematics the negative leg goes to ground.

[frokost]

Yep, suregork is talking about the layout. I built the Ross from this layout by the paint-by-number method back in the day and didn't notice. As far as I can tell now, is that the cap is part of the biasing for the IC. What happens when it's reversed, I still don't know for sure  . Ripple?

[TrentC]

Good eye Suregork!

[Talison]

I am also new to this forum.  I have built the Silicon Fuzz Face from a Vero layout, and I have built an Octave Fuzz and Booster from a kit.

My next project is going to build a compressor.  I would like to build the Ross, but I don't want the Fuzz mod.  How would I build the Ross Compressor from the Vero layout above WITHOUT the Fuzz/switch mod?

Any help would be greatly appreciated.

Thanks!

[jacobyjd]

Talison--just to make sure you're clear on what that switch does--it's not really a Fuzz mod (even though the schematic is from the fuzzcentral website). It's an attack control.

If you look up a regular Ross Comp schematic (try tonepad.com), you can find the normal resistor value that goes there if you don't want it. I think it might be a 47k.

[Talison]

Thanks for the reply!

I am about to show my ignorance, but here it goes... I am planning on building this from the vero layout.  Are there certain resistors I need to leave out and/or change the value?  and if you can be more specific, like R# from the layout.  sorry, I'm still learning how to read schematics.

[Talison]

maybe I'm just unsure on how to wire the switch.  I grasp wiring R23 across lugs 1 & 3.  Looks like lug #1 also goes to the SW P on the vero, is this right?  Then where do I wire lug 2 & 3 of the switch?  My ignorance is REALLY shining now.  Thanks for any help / input!

[stringsthings]

maybe I'm just unsure on how to wire the switch.  I grasp wiring R23 across lugs 1 & 3.  Looks like lug #1 also goes to the SW P on the vero, is this right?  Then where do I wire lug 2 & 3 of the switch? 

lug #2 is connected to SW P on the vero and lug #3 is connected to SW on the vero ...

How would I build the Ross Compressor from the Vero layout above WITHOUT the Fuzz/switch mod?

leave out R3 ( 10k ) and solder in R1 ( 150k ) in its place ...

[Talison]

Thanks for the Help!!!!   This is the best site on the Internet!!!!!  It continues to feed my new addiction!!!!!!!