owlexifry
Well-known member
- Build Rating
around the same time that I had the idea of doing the discrete opamp SD-1 with the Wilhelm Scream PCB, i also pondered similarly about the ST-9 and thought
what if,
instead of having an ST-9 based around the TS-808/TS-9, why not build one based around Boss SD-1 values instead?
initial breadboard results, fantastic. big fan.
comparably, to me, it made the og ST-9 appear somewhat boxy and inferior. hell yeah.
so i made some adjustments so that it would work on an AionFX Cirrus board.
another deviation - technically for a ‘true SD-1’ spec, C5 should be 18n. i felt it was too small/thin coming after the mid boost stage so i bumped it up to 100n (stock value = 1u).
here's a 1st for me:
top mount open frame jacks in a 1590B. (a happy coincidence that they just happened to fit after drilling for what i would normally use)
mod list:
(referenced to this schematic)
DRIVE: B1M
LEVEL: B10K
R1: 10K
R2: 470K
C5: 100nF
R6: 100K
C6: delete
R7: 33K
clipping diodes: asymmetrical (2+1) 1N4148.
R9: 10K
C8: 18nF
R10: delete
C9: 27nF
R11: 470R
R12: 10K+10nF (parallel)
R13: 4.7K
C11: 22K > 47nF (series)
R14: 470K
R16: 100K
R17: 1K
R18: 33K
R19: 33K
tayda's matte green sand is a new favourite.
here’s a demo comparing this vs. ST-9pro+
(again on the Normal/crunch channel instead of OD/lead channel for more enhanced boosting effect)
what if,
instead of having an ST-9 based around the TS-808/TS-9, why not build one based around Boss SD-1 values instead?
initial breadboard results, fantastic. big fan.
comparably, to me, it made the og ST-9 appear somewhat boxy and inferior. hell yeah.
so i made some adjustments so that it would work on an AionFX Cirrus board.
another deviation - technically for a ‘true SD-1’ spec, C5 should be 18n. i felt it was too small/thin coming after the mid boost stage so i bumped it up to 100n (stock value = 1u).
here's a 1st for me:
top mount open frame jacks in a 1590B. (a happy coincidence that they just happened to fit after drilling for what i would normally use)
mod list:
(referenced to this schematic)
DRIVE: B1M
LEVEL: B10K
R1: 10K
R2: 470K
C5: 100nF
R6: 100K
C6: delete
R7: 33K
clipping diodes: asymmetrical (2+1) 1N4148.
R9: 10K
C8: 18nF
R10: delete
C9: 27nF
R11: 470R
R12: 10K+10nF (parallel)
R13: 4.7K
C11: 22K > 47nF (series)
R14: 470K
R16: 100K
R17: 1K
R18: 33K
R19: 33K
tayda's matte green sand is a new favourite.
here’s a demo comparing this vs. ST-9pro+
(again on the Normal/crunch channel instead of OD/lead channel for more enhanced boosting effect)
Last edited: