SM Fuzz

dread pierat · Post by **dread pierat** » 24 Aug 2012, 19:15

It is a boutique style Fuzz Face only it is made by an engineer.

Microcontroller transistor bias circuit for temperature compensation. Two separate boards, one on each side, hanging from an Alpha pot and a Cliff jack. RoHS except for the AC128 transistors. Low profile IDC connectors and smt technology.

http://www.smfuzz.com/gallery/

~arph · Post by **~arph** » 24 Aug 2012, 20:11

dread pierat wrote: RoHS except for the AC128 transistors.

Not RoHS then...

Sadly no images of the uC. Any info on that?

Firedragn07 · Post by **Firedragn07** » 27 Mar 2013, 03:14

Anyone got a schematic or layout for this?

mictester · Post by **mictester** » 27 Mar 2013, 06:53

How silly! What possible use is the microcontroller (unless it's operating a bypass relay)? If you want to do temperature compensated bias, there are simple analogue circuits that will achieve it with just a few parts. You could even make use of the "Fuzz IC" (CA3046) for the bias compensation.....

This looks like an example of complexity just for the sake of making something difficult to copy. There is always a risk of having digital noise breakthrough into the high gain analogue circuitry - just ask any manufacturer of clocked effects! This really is silly!

Jack Deville · Post by **Jack Deville** » 27 Mar 2013, 07:05

Then you should do it better.

freq67 · Post by **freq67** » 27 Mar 2013, 14:04

as an engineer..... wondering why he didn't socket the trannys?

phibes · Post by **phibes** » 27 Mar 2013, 14:16

freq67 wrote:as an engineer..... wondering why he didn't socket the trannys?

Why?

Firedragn07 · Post by **Firedragn07** » 27 Mar 2013, 14:33

Jack Deville wrote:Then you should do it better.

Hah, easy for you to say Jack...you're already awesome at designing

I've just dipped my toe in to the world of pedal building...I'm a whole *1* pedal deep so far, and it was a kit! But I loved the experience and am now interested in learning all I can.

The SM Fuzz is one I'm curious about as it's just become available directly in the States...but after the Jan Ray debacle I'm just not interested in buying pedals anymore. Just learning to build, design and modify.

freq67 · Post by **freq67** » 27 Mar 2013, 20:40

phibes wrote:
freq67 wrote:as an engineer..... wondering why he didn't socket the trannys?
Why?

Cause I put them up my nose to warm them up before I use them.

devastator · Post by **devastator** » 29 Mar 2013, 22:38

mictester wrote:How silly! What possible use is the microcontroller (unless it's operating a bypass relay)? If you want to do temperature compensated bias, there are simple analogue circuits that will achieve it with just a few parts. You could even make use of the "Fuzz IC" (CA3046) for the bias compensation.....

This looks like an example of complexity just for the sake of making something difficult to copy. There is always a risk of having digital noise breakthrough into the high gain analogue circuitry - just ask any manufacturer of clocked effects! This really is silly!

no need to go far by the way, just look at the temparature compensation in VCOs of analog synth .

CircuitBendah · Post by **CircuitBendah** » 16 Oct 2013, 04:16

Would love to know if anyone has more info on this circuit.

mictester · Post by **mictester** » 16 Oct 2013, 05:32

Jack Deville wrote:Then you should do it better.

Jack - I already do!