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Attenuator

Eurorack attenuator dongle

Features

Passive attenuator, approximately -20 dB
A small dongle that can be patched between modules or devices
Bidirectional - plug it in either way around!

Notes

I made two of these small attenuator dongles for my Eurorack system because I kept running into situations where I want to knock down the signal level by a large amount. I have a fancy attenuverter module but I just wanted something small and simple that would leave the attenuverter free for more important jobs.

My particular reasons for using this attenuator are:

Using a tuner (or other external device) - I have a tuner that has trouble with the signal level straight out of a Eurorack VCO, so I keep one of these attenuators plugged into the tuner.
Bad design choices - I made the pitch mod inputs on my oscillator modules way too sensitive. Even though there's an attenuator control on the input, it's hard to get a reasonable vibrato when I patch in an LFO. Sending the LFO through this attenuator gives a much better range of adjustment on the pitch mod input, for most purposes.

The device is assembled on a small piece of stripboard PCB. See the attached layout diagram.

Please note that I am a hobbyist, not a trained electronics engineer. No guarantees!

Software Used

KiCad 7.0.8

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Attenuator

Features

Notes

Software Used

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Attenuator

Features

Notes

Software Used