I noticed that it has been just over a month since my last post but this is a big one.

After many months of struggling to make a prototype on my v2.2 attenuator, I have finally successfully assembled one. It is like the Thomas A. Edison quote, “I have not failed. I've just found 10,000 ways that won't work.” It is more like 20 ways in the case of the v2.2 attenuator but it feels like 10,000.

Pictured below is a headless version of the attenuator. Headless because it does not have a knob or switches to make adjustments but instead it is controlled by a remote. I have completed the initial electrical tests and it works as designed! It has also held a vacuum for over three days now without any noticeable air infiltration. It is remarkably quiet when adjusting the gain or changing the selected input.

Next up - finish assembling the left channel mate for the attenuator pictured below and then complete a pair with the motorized knobs and input selector switches. I have over 90% of the required parts so after I order the last remaining parts, it is a matter of some really careful assembly work.

Front right corner of v2.2 headless attenuator.

Rear left corner of v2.2 headless attenuator.