DIYRACKED DR-MB2 GSSL clone
- Patrick Joericke
Projecttitel: DIYRACKED DR-MB2
Status: IN PROGRESS
Startdate: 01/2025
Duedate: 02/2025
Manufacture page: https://www.diy-racked.com/product/dr-mb2/
price: 312€ case and panel, pcbs
without any further part, total price depends on your home stock.
with a optimized mouser cart (buy 10 resistors instead of 8 ) and using tme.eu and reichelt or other shops around 400€ for all parts plus the 312€ for the case/pcb kit = around 700€
the knobs, stepped potentiometer can be replaced by cheaper parts if required.
BOM and “buildguide”:
BOM notes:
I bought the most parts from tme.eu and mouser.com
from Donaudio:
VU-Meter S-500 dB Compression White 43,70 €
1 x Classic British Console Pushbutton Switch Illuminated Yellow 17,34 €
2x Classic British Console Pushbutton Switch Illuminated Blue 34,67 €
7x Elma Classic Collet Knob 21mm gray, indicator line, glossy 27,91 €. make sure it matches with your potentiometer and rotary switch diameters, which must be 6mm instead of 1/4inch
7x Classi Knob Cap 21,3mm Blue Glossy Indicator line by Elma 7,69 €
1x Classi Knob Cap 21,3mm Blue Glossy None by Elma 0,89 €
1x Rotary Switch 2024 Gold, 2 Pole 24 Position, goldplated 18,34 €. double check diameter - data sheet is different to website. or buy a stereo potentiometer and save 15€
Gesamtsumme:156,53 €
pay attention on this major issue:
the pcb is very close to the bottom, you must be cut all pins very close to the pcb but not in the solderpint itself.
attach self adhesive rubbers at the pcb- to prevent contact to case.
build notes:
in case that your pcb doesn't match with the rear cutouts or with the bottomcase plate spacers, remove the rearpanel screws - attach
the pcb to the bottom and then mount the rear panel or just re-install the screws. in worst case wide the pcb holes with 3.5mm or 4mm.
Meter pinout:
the upper connectors are the Meter input (AC)
the lower connectors are for the LED, from rear view is the left pin + and right pin is minus.
make sure to connect a 1K resistor at + side and connect in series the input cable from the compress switch
THAT opamps/drivers:
make sure to buy A or B-grade THAT2181-BL or THAT2181-AL not C grade.
B grade are available by mouser.
A grade versions are available too
https://eu.profusion.uk/de_en/that2181al08-u
OP-Amp availability
you can´t buy all other opamps in DIP-8, you should go for SMT with adapters, or ask me - I have adapters or can prebuilt it for you.
PCB Scan:
Related content
how to bugfix: https://diysynth.wiki.dsl-man.de/wiki/spaces/SKM/pages/336101402/How+to+bugfix
non commercial pages, all infos are best can do without warranty, without liability.