brownwhopping wrote:How can I learn by reading threads an making circuits, when some day I can see a lawsuit or somebody beat me in the face for that?
Nocentelli wrote:The bass and sub-bass on many analog octaves jumps around, e.g. even boss OC-2 which is fairly well regarded us not immune.
Could you take some close up pictures of the board? It may provide some hints as to the soprano problem, and maybe even a trace could be attempted.
bajaman wrote:reduce the file size of any pictures to 1Mbyte or less and you are good to go
bajaman wrote:some pictures o the other side of the board are good to help anyone wishing to trace the circuit too
pinkjimiphoton wrote:these were designed for brass... there was a pickup and preamp (i think) assembly before the multivider.
the soprano is indeed an octave up and should be fairly farty sounding. its basically like a division down organ, it fuzzes and gives ya various octaves.
always wanted to fuck around with one of these. its likely not broken.
first thing i'd do would be replace every single electro and tant cap on the board.
then it will probably work.
if not, use an audio probe and multimeter. the ge q's don't just go bad, and i think these were using silicon by the time they got this far
marcao_cfh wrote:I use postimages.org to upload images. It's nice, free and doesn't need registration, so you can easily upload better resolution pictures. Also, you get an "ready to post" code with the image url, so you just need to copy and paste here.
grizzlytone wrote:Here's a link to my homedrawn schematic and my notes regarding the soprano circuit. There's no clipping stage. I had some trouble with the soprano circuit as well when trying to use it as a guitar effect. Apparently I worked at balancing the soprano circuit frequency doubler (which is what it really does) and ended up replacing the FET's w/ matched 2N5457 and balancing the doubler circuit (trimmer provided) for a nice full wave rectified output at the oscilloscope.
Also notice that input threshold for getting any signal at all out of the doubler circuit is -28 dBu with the sensitivity control at max (compared to - 48,4 dBu for the octave down effect). I always take it that a "nominal" guitar output level is about -30 dBu although humbuckers produce a bit more output than this and the attack transient on a normal output may be say -10 dBu. So this might be your problem as well. Try using a booster ahead of the multi-vider to confirm that this is the cause of the missing effect.
https://postimg.org/image/9ahaua4bp/
https://postimg.org/image/opgbx9zpx/
Good luck
/M
JD0x0 wrote:grizzlytone wrote:Here's a link to my homedrawn schematic and my notes regarding the soprano circuit. There's no clipping stage. I had some trouble with the soprano circuit as well when trying to use it as a guitar effect. Apparently I worked at balancing the soprano circuit frequency doubler (which is what it really does) and ended up replacing the FET's w/ matched 2N5457 and balancing the doubler circuit (trimmer provided) for a
Wow! Awesome! Thank you so much for this.. Would J113's work by chance for the FET's? The 2n5457's are cheap enough, but I've should have the J113's arriving in a couple days for another repair.
I don't seem to have any trouble triggering this pedal with single coils. It seems to trigger better than my Parasite audio CMOS based effects that I've built. They have trimmers to set the sensitivity, they definitely seem to function ALOT better with a compressor up front. Hard to find a setting, where they don't oscillate, but also don't cut out too early. The Multivider doesn't seem as temperamental, with my guitars compared to those pedals. I think that's one of the reasons I like this pedal so much. That, and, with the mix on the clean/octaves set right, it works surprisingly well, polyphonically.
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