Wednesday, June 26, 2019

3x Passive Audio Attenuator: One Hour Build!

Time for another easy one, and maybe my shortest AudiodiWHY post to date, which may not be a bad thing? Simple Passive Attenuator.

You can build something like it out of junk parts, but it might get used a lot!

No decal--skipping straight to FPE finished module looks like this:

I needed this module because I have gotten into Eurorack recently  and there seems to be not a whole lot of consistency in output P/P voltages. Some of them output (say) 2V P/P while for others it's about 5 or 7 or 10V P/P.

Maybe that "hot" output signal needs to be turned down so the next module doesn't distort--since we know it's never cool to smoke Doepfer. But the good news: it's easy to attenuate them hot signals using something like this:

I built this up out of junk parts and an "alubase" panel I had leftover from a PCBWAY order.

Here's the obligatory photo of the back:

Another bonus: I am a rare but devoted Frac guy, and Frac power supplies can get a bit over sized; they can stick out into the module next door when you beef 'em up, which you usually need to do. Putting a passive panel, with no PCB sticking out the back, next to the Frac's "wing" power supply keeps things from shorting out. Thank goodness!

Not much more to say here except it's fun to think up passive modules--i.e., no need for DC power. Can a Low pass gate be passive?  Yep. Can a distortion module be passive?  Yes--check out the previous post here.

Hours of fun, maybe not? but an hour of fun?  yep.

OK it took me less time to write this post than build this module but not much. Again maybe not a bad thing. See ya next time.

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