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Topics - imjonwain

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Open Discussion / PCB Fab
« on: April 01, 2020, 09:28:24 PM »
I usually use PCBway for fab and am happy with them for multi-layer boards however their prices aren't too great for thicker PCBs or 2oz+ copper traces. 

I want to do a single sided PCB that is 2mm thick (or more) with 2oz copper and no plated through holes.  Anyone know of a cheap or reasonable fab place for this sort of work?  I see it fairly often in some newer amps but I'm guessing it's only cheap in volume?


General Questions / Boss fz-2 owner question
« on: December 12, 2019, 08:45:28 PM »
Does anyone on here have an original Boss FZ-2 or a hyped fuzz clone built? I have a clone running and am getting oscillation when I have the gain and Hi controls maxed in boost mode.  The oscillation starts at the high end of the audio range moves up to about 60kHz and then down to ~34kHz (aka I can't hear it and audio cuts outs).  It's pretty much square wave.

No such "problem" in the fuzz modes, which are pretty out there anyway and do semi self oscillate at max gain. The original manual actually warns about oscillation in boost mode when the "depth" is too high.

After messing with the board and components for a while the issue was wiring/my test bench setup.  I always put the ox before the damn cart....  Using a 2" long shielded input wire and short output wires to my cables solved the oscillation and instability issues.  I did also match my jfets and cherry pick my other transistors as well in the mean time but that didn't change much.   

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