To me also the 1M resistor on Q4 (Q3 if you go with SSRP config.) base is redundant..the gain pot makes the biasing needed (at least they did in that way on the real valve circuits, and in their FET conversion of course.. ) I don't agree. because of the 4.7n coupling cap, the gain pot is seperated ...

What I would like to know , because I havent built it yet is : Do I need the coloured resistors ? I left out two sourcefollowerfets because the circuit is already very low impedance. Alf You can leave them out. They are the biasing resistors for the source followers, and are insignificant tonewise....

has something I came up with called Max-end-all 2 Band EQ: an excellent hi-cut with a great Bass control having the proprietary ability to bring in incredible sounding midrange when the pot reaches around 3 o'clock on its rotation. Come on! Is he claiming to have invented the baxandall? Anyone can ...

Diamond stuff is top notch when it comes to build quality (and soundwise).
They are also reasonably priced for what you get.

Thanks for the pics soulsonic.
You're right, It looks like a pain to trace...

MOSFET's has larger input impedance than BJT's. Therefore, they are theoretically more suitable for input stages. Why theoretically? because it depends on the bias. The bias resistors can decrease the effective input impedance. BJT's has better driving capabilities and lower output impedance. Theref...

No hard feelings

Thanks again for your work on the tracing.

PLEASE do not try to build this smd layout - it is for educational reference only - you will go blind if you try and build it :wink: :D bajaman I can't imagine why anyone would want to clone this horrible sounding unit :? it's funny to see that is, in fact, another "original" SHO cascaded...

Great project! Soulsonic, could you explain (or better yet - draw) the bypass scheme you used? (I also posted a comment on your site, but that was before I came across this thread...sorry...) Thanks! It's the type of bypass that connects the input of the effect to ground when it's bypassed. I'll tr...

Great project!

Soulsonic, could you explain (or better yet - draw) the bypass scheme you used?
(I also posted a comment on your site, but that was before I came across this thread...sorry...)

Thanks!

soulsonic wrote:When you just use a resistor only, the voltage can fluctuate as more or less current gets drawn by the signal.

but isn't that the whole idea of sag?

BYOC has a Ross clone with a blend knob. here:
http://buildyourownclone.com/compressorinstructions.pdf

It uses 2 additional trannies for the buffering of the input signal and the mixing.

I'm also just starting to learn this, so I don't have any tips yet :cry: However, I've bought RG's book on PCB layout (through smallbear), and I highly recommend it. It's oriented towards stompbox layouts so you won't get lost. Anyway, that's my 0.02$, but I would also like to hear any other tips fr...

I really like the way the layouts at http://www.tonepad.com looks like.

Does anybody have a clue as to which software Francisco uses?

Thanks a lot Jim!

I will try this technique on my upcoming build.

I have a soldering question: Up until now I have been using sockets for transistors. I've heard that this could be a problem because they can fall out of the sockets with the right amount of shaking. So I wanted to ask what the proper way to solder transistors is. I've heard about using tweezers/pli...

JHS wrote:... w/o any comment...
... similar circuits for producing voltage sag can be found in a lot of the newer (B)-drives and -fuzzes.



JHS

Could you please be more cryptic?

JHS wrote: Power it with a sag control (similar to what you find in the newer Roger Mayer boxes).

JHS, I'm also VERY interested in this.
How would I go about doing that?
I would imagine that it's more than just a variable resistor in series with the battery.

Are they suitable for fuzzfaces/tonebenders/rangemasters?

Thanks,
Mike.

I found this as well:
http://www.oselectronics.com/ose_p81.htm
They have it for $7.95.

I also found a different one: XR2206, though it's not a direct replacement.
If it's more readily available, it may be worth redesigning the LFO section around it.

bajaman wrote:Hey Mike_a
Any chace of a track side picture(s)
bajaman

Sorry, but I don't know the guy.
I just saw it posted on a forum somewhere.