The best thing about DIY: you can make things the way you want! I already have a DIY attenuverter in my rack, in FRAC format (+/- 15V). My Modular Synth geek group have been telling me: stop it, the only format left is Euro and large format.
I have a bit of space in my Eurorack setup, so, let's get building--let's port last post's design to Euro.
Previous posts for this SEM style attenuverter are here (prototyping), here (Skiff depth attenuverter) and here (improving the module's bias control).
To summarize those posts, because, who reads blog posts anyway? I always liked the sound/feel/response of the attenuverters found in the Oberheim SEM.
The legendary Tom Oberheim confirmed via email that his design used a center tap pot.
I bought a few ( ALPS RK11K114) and built a few.
....so for all you Doepfer smokers--Part IV--same thing for Eurorack:
Finished module |
Boards were already laid out in Eagle; I only needed to change power connectors and add a few 100 mil test points to gang 2 attenuverters in series.
I also needed to design a Eurorack sized front panel:
I used the previous board and paper templates to create a new front panel. But--would everything fit? |
BAM!! they are back:
Happy weekend--new boards from PCBWAY. Thanks to those guys for helping out this blog. |
Next I got soldering.
The design had 2 SOIC op amps, but those aren't too hard to solder. Use a fine tipped solder pen, flux, and patience.
Beyond that, this is all through-hole. Happy day.
Only a couple mistakes, which i corrected in the gerbers uploaded to the PCBWAY project page (here); I forget to silk "red stripe" on the back of the PCB (oops) corrected below with a p-touch label. Wow, dumb error.
The CON xxx connector sets from All Electronics are inexpensive handy for connecting signals between modules. 2.54mm spacing...nice. |
Rear view--two attenuverters chained together |
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