Steda SR-909
Projecttitel:Steda SR-909
Status: DONE
Startdate: 03/2022
Duedate: 06/2022
updated 03/2026
Manufacture link: https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://stedaelectronics.com/&ved=2ahUKEwiE25fEiaWTAxU_c_EDHToXLMwQFnoECCAQAQ&usg=AOvVaw2JNZYemgNNTclMMW9Rs7O0
BOM
TD62783 =IC603 54562P
uPA53C = IC 602 54516P
Buildguide:
Assembly Partfinder pdf:
Forum
https://modwiggler.com/forum/viewtopic.php?t=225405
Build notes
to avoid desoldering tasks..
the log leg is positive - which means the pin is on top.
ignore the red color at the black body of the switch, its just an info which color the led has.
Modification: EXT Mod
ExtMod BOM - the parts are normally included but you should need this:
Modification Noise Gain
i installed a 50K Trimmer in the noise output path,
just scratch/destroy the trace and solder a 50k trimmer between the 2 Vias.
you can simply use 2 resistor legs and put them thru the Vias and solder from the Pan solder side a trimmer.
MODIFICATION Secondary Noise Mod:
my version was build with addon second Noise source for fixing the loudness balance with snare and handclap
Gerber File v3 from Altitude :
https://www.e-licktronic.com/forum/viewtopic.php?t=837&start=70
Installation: Remove ONE side of R208 (the side connected to pin 9 IC33, the other side is connected to R209) and solder a wire from the NOISE output of the new noise board to that leg of the resistor.
Powersupply guide:
correct Orientation Q82 Q83
ZTX1051
ba662 clone
in case you need a ba662 clone, I have this for sale populated and PCB only version
https://www.diysynth.de/advanced_search_result.php?categories_id=0&keywords=ba662&inc_subcat=1
Build 2025 and repair: